{ "name": "AgainstPest species dataset", "description": "Common and scientific names, written diagnostic features, distribution, prevention measures, and confused-with pairs for US structural pest species.", "license": "https://creativecommons.org/licenses/by/4.0/", "attribution": "AgainstPest — https://againstpest.shop", "version": 1, "updated": "2026-08-17T00:00:00.000Z", "note": "Distribution and seasonality statements are generalized from university extension sources and are verified per species in REGULATORY-SOURCING-LOG.md. Ranges shift; every species page carries a visible review date.\n", "methodology": "https://againstpest.shop/editorial-policy/", "count": 39, "species": [ { "id": "carpenter-ant", "common_name_en": "Carpenter ant", "common_name_es": "Hormiga carpintera", "scientific_name": "Camponotus spp.", "aliases_en": [ "big black ant", "wood ant", "black carpenter ant" ], "aliases_es": [ "hormiga de madera", "hormiga negra grande" ], "category": "ants", "category_name": "Ants", "size_mm": [ 6, 13 ], "identification_confidence": "field", "confidence_note": "Camponotus is recognizable to genus by a careful non-expert. Species within the genus needs a specialist, and rarely changes what you do.\n", "diagnostic_features": [ "The thorax seen from the side is evenly rounded in a single smooth arch, with no spines or dips. This is the most reliable carpenter ant feature and it separates the genus from nearly every other large ant.", "There is one node — a single raised bump — on the narrow waist between thorax and abdomen. Count it from the side against a light background.", "The antennae are elbowed, bending sharply partway along their length, and the body is clearly divided into a narrow, pinched waist.", "Workers vary continuously in size within one colony, from about 6 to 13 mm, so finding both large and small ants together is normal rather than evidence of two species.", "Colour is usually solid black, though several species are black with a dull red or reddish-brown thorax." ], "evidence_left": [ "Coarse sawdust-like shavings, often mixed with insect body parts, pushed out of a crack or a small round hole. The material is fibrous, not pelletized.", "A dry rustling or faint crackling inside a wall or window frame, most audible at night.", "Winged swarmers indoors in spring, which indicates a mature colony in or very near the structure." ], "distribution": "Throughout the continental United States, with the largest species most commonly reported in the Northeast, Upper Midwest, and Pacific Northwest.", "biology": "Carpenter ants do not eat wood. They excavate galleries in it to nest, which is why they concentrate in wood that is already wet or decayed — around leaking window frames, poorly flashed chimneys, sill plates over damp crawl spaces, and porch columns. A mature colony often keeps satellite nests indoors while the parent colony stays outside in a stump or a woodpile, which is why removing one nest frequently does not end the activity. The moisture that made the wood habitable is the actual problem, and correcting it is what prevents recurrence.\n", "prevention": [ "Correct the moisture source first — a leaking gutter, a failed window seal, a downspout discharging against the foundation. Dry wood is poor nesting habitat.", "Trim tree limbs and shrubs so nothing touches the roof or siding, since branches are the most common bridge into an upper storey.", "Move firewood, landscape timbers, and stored lumber away from the foundation and keep them off the ground.", "Replace any wood that is already soft or spongy; sealing over decayed wood leaves the habitat intact." ], "confused_with": [ "subterranean-termite-swarmer", "odorous-house-ant" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Carpenter ants signal moisture damage and often nest inside structural members. Finding the nest and assessing the extent of decayed wood is the part that matters, and it is genuinely difficult from inside a finished room.\n", "health_flag": null, "url": "https://againstpest.shop/identify/ants/carpenter-ant/", "same_as": [ "https://en.wikipedia.org/wiki/Carpenter_ant", "https://www.wikidata.org/wiki/Q193661" ] }, { "id": "odorous-house-ant", "common_name_en": "Odorous house ant", "common_name_es": "Hormiga olorosa", "scientific_name": "Tapinoma sessile", "aliases_en": [ "sugar ant", "coconut ant", "stink ant" ], "aliases_es": [ "hormiga del azúcar", "hormiga de coco" ], "category": "ants", "category_name": "Ants", "size_mm": [ 2.4, 3.3 ], "identification_confidence": "field", "confidence_note": "The crushed-ant odour is a genuinely reliable field test and needs no equipment, which makes this one of the easier identifications on the site.\n", "diagnostic_features": [ "Crushed workers give off a distinct sweet, musty smell often described as rotten coconut or blue cheese. This is the definitive field test and no other common household ant does it.", "Workers are uniform in size, roughly 3 mm, unlike carpenter ants which vary within a colony.", "The single waist node is flattened and hidden beneath the front of the abdomen, so from above the ant appears to have no visible node at all.", "Colour is uniform dark brown to black, and the body has a slightly greasy or shiny appearance.", "They move in persistent trails along counter edges, baseboards, and plumbing lines rather than wandering singly." ], "evidence_left": [ "Continuous trails to a specific food or moisture source, most often something sweet.", "Sudden appearance indoors after heavy rain, when outdoor nests flood." ], "distribution": "Throughout the United States; one of the most commonly reported indoor ants nationally.", "biology": "Colonies have many queens and readily split into satellite nests, which is the reason this species persists. Disturbing a colony with a repellent product can cause it to fragment into several colonies — a phenomenon called budding — and produce more trails than before. That is why identification matters before anyone acts, and why sanitation and moisture work outperform reactive spraying for this species specifically.\n", "prevention": [ "Remove the food source the trail leads to, then clean the trail itself with soapy water to erase the chemical path other workers follow.", "Store sweet foods, pet food, and ripe fruit in sealed containers.", "Fix dripping taps and condensation under sinks; this species is drawn to moisture as much as to sugar.", "Seal the entry gaps around plumbing penetrations and along the sill." ], "confused_with": [ "carpenter-ant", "pavement-ant" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Sanitation, moisture correction, and sealing resolve the great majority of odorous house ant complaints, and reactive spraying can make the problem measurably worse by causing the colony to bud.\n", "health_flag": null, "url": "https://againstpest.shop/identify/ants/odorous-house-ant/", "same_as": [ "https://en.wikipedia.org/wiki/Odorous_house_ant", "https://www.wikidata.org/wiki/Q2400990" ] }, { "id": "pavement-ant", "common_name_en": "Pavement ant", "common_name_es": "Hormiga del pavimento", "scientific_name": "Tetramorium immigrans", "aliases_en": [ "sidewalk ant" ], "aliases_es": [ "hormiga de acera" ], "category": "ants", "category_name": "Ants", "size_mm": [ 2.5, 4 ], "identification_confidence": "field", "confidence_note": "The paired thoracic spines and head grooves are visible with a hand lens and are decisive.", "diagnostic_features": [ "The head and thorax carry fine parallel grooves running front to back, visible under a hand lens as a striped or engraved texture.", "There are two small spines projecting backward from the rear of the thorax, and two nodes on the waist rather than one.", "Colour is dark brown to black with paler, often yellowish legs and antennae.", "Workers are uniform in size at roughly 3 mm." ], "evidence_left": [ "Small mounds of excavated soil pushed up through cracks in driveways, patios, and sidewalk joints.", "Large numbers of workers on paving in spring, sometimes in mass confrontations between neighbouring colonies." ], "distribution": "Common across the eastern and midwestern United States and increasingly reported in the West; strongly associated with paved and disturbed urban ground.", "biology": "Nests are outdoors under slabs, stones, and paving, and workers enter buildings to forage rather than to nest. Indoor activity is usually a foraging trail from an outdoor colony, so the entry point matters more than anything found indoors.\n", "prevention": [ "Seal the expansion joints and foundation cracks the trails emerge from.", "Keep food debris off patios and around outdoor bins.", "Reduce moisture along the slab edge where colonies concentrate." ], "confused_with": [ "odorous-house-ant", "little-black-ant", "red-imported-fire-ant" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Pavement ants nest outdoors and forage in; sealing the entry route and removing the attractant resolves most indoor complaints.", "health_flag": null, "url": "https://againstpest.shop/identify/ants/pavement-ant/", "same_as": [ "https://en.wikipedia.org/wiki/Tetramorium_immigrans" ] }, { "id": "little-black-ant", "common_name_en": "Little black ant", "common_name_es": "Hormiga negra pequeña", "scientific_name": "Monomorium minimum", "aliases_en": [ "tiny black ant" ], "aliases_es": [ "hormiga diminuta" ], "category": "ants", "category_name": "Ants", "size_mm": [ 1.5, 2 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Extremely small at 1.5 to 2 mm, noticeably smaller than pavement or odorous house ants seen alongside them.", "Uniform jet black and shiny, with no grooving on the head or thorax.", "Two nodes on the waist and no spines on the thorax.", "Workers are all the same size and move in slow, dense trails." ], "evidence_left": [ "Very fine trails along mortar lines, cabinet edges, and window frames.", "Small craters of fine soil in lawns and beneath objects on the ground." ], "distribution": "Widespread across the United States, most commonly reported in the East and South.", "biology": "Colonies have multiple queens and nest in soil, rotting wood, and wall voids. Their small size means they exploit gaps that exclude larger ants, so sealing has to be thorough to matter.\n", "prevention": [ "Seal fine gaps around window frames, mortar joints, and utility penetrations.", "Remove food residue from cabinet interiors and appliance gaps." ], "confused_with": [ "pavement-ant", "pharaoh-ant", "thief-ant" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "An outdoor-nesting, food-driven forager; sanitation and sealing address it directly.", "health_flag": null, "url": "https://againstpest.shop/identify/ants/little-black-ant/", "same_as": [] }, { "id": "pharaoh-ant", "common_name_en": "Pharaoh ant", "common_name_es": "Hormiga faraón", "scientific_name": "Monomorium pharaonis", "aliases_en": [ "sugar ant" ], "aliases_es": [ "hormiga faraona" ], "category": "ants", "category_name": "Ants", "size_mm": [ 1.5, 2 ], "identification_confidence": "expert", "confidence_note": "Pharaoh ants are easily confused with other tiny yellowish ants, and the distinction matters a great deal in hospitals and multi-unit housing. Have a specimen identified rather than guessing — your county extension office will often do it at no cost.\n", "diagnostic_features": [ "Very small at under 2 mm and pale yellow to light golden brown, often with a darker abdomen tip, appearing almost translucent against a white surface.", "Two nodes on the waist and three-segmented antennal club, which requires magnification to see.", "Workers are uniform in size and move in slow, steady trails, frequently along plumbing and electrical runs." ], "evidence_left": [ "Persistent indoor trails in heated buildings year-round, including in winter.", "Activity concentrated around water sources, bathrooms, and kitchens in apartment buildings and institutions." ], "distribution": "Throughout the United States as an indoor pest; cannot survive outdoors in most of the country and is essentially always a building-associated population.", "biology": "This species is the reason identification matters in multi-unit housing. Colonies have many queens, nest deep in wall voids and equipment, and respond to disturbance by budding into multiple new colonies — so an untargeted spray application reliably makes a pharaoh ant problem larger and spreads it to neighbouring units. Coordinated building-wide management is the only approach that works.\n", "prevention": [ "Report activity to building management early, because a single-unit response cannot resolve a building-wide population.", "Keep food sealed and surfaces dry; deny the moisture these colonies depend on.", "Do not apply repellent products, which cause colonies to bud and spread." ], "confused_with": [ "little-black-ant", "thief-ant" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Budding behaviour means uncoordinated treatment makes it worse, and in multi-unit buildings the population usually spans units. This needs a building-wide plan, not a unit-by-unit reaction.\n", "health_flag": null, "url": "https://againstpest.shop/identify/ants/pharaoh-ant/", "same_as": [ "https://en.wikipedia.org/wiki/Pharaoh_ant" ] }, { "id": "red-imported-fire-ant", "common_name_en": "Red imported fire ant", "common_name_es": "Hormiga roja de fuego", "scientific_name": "Solenopsis invicta", "aliases_en": [ "fire ant", "RIFA" ], "aliases_es": [ "hormiga brava", "hormiga colorada" ], "category": "ants", "category_name": "Ants", "size_mm": [ 2, 6 ], "identification_confidence": "field", "confidence_note": "The mound structure plus aggressive swarming response is distinctive within the species' range.", "diagnostic_features": [ "Reddish-brown head and thorax with a darker abdomen, and workers of clearly varying sizes within one colony.", "Two nodes on the waist and a two-segmented antennal club.", "Mounds are dome-shaped, up to about 45 cm across, with no single central opening — this absence of an obvious entrance hole is characteristic.", "Disturbing a mound produces immediate, coordinated swarming up vertical surfaces followed by near-simultaneous stinging." ], "evidence_left": [ "Dome mounds in open sunny turf, appearing rapidly after rain.", "Stings producing a burning sensation followed within a day by a distinctive sterile white pustule." ], "distribution": "Established across the Southeast and south-central states and parts of California; under federal and state quarantine in much of that range.", "biology": "Colonies relocate readily and can contain multiple queens. Stings are medically significant for people with hymenoptera allergy, and the characteristic pustule is a useful retrospective identifier.\n", "prevention": [ "Keep play areas, patios, and walkways mown and inspected so mounds are found before someone stands on one.", "Reduce standing water and overwatering in turf, which concentrates colonies.", "Wear closed footwear in infested turf." ], "confused_with": [ "harvester-ant", "pavement-ant" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Medically significant stings, quarantine regulations affecting soil and nursery stock movement, and colony relocation behaviour together put this beyond a reasonable homeowner response in most established-range settings.\n", "health_flag": null, "url": "https://againstpest.shop/identify/ants/red-imported-fire-ant/", "same_as": [ "https://en.wikipedia.org/wiki/Red_imported_fire_ant", "https://www.wikidata.org/wiki/Q133105" ] }, { "id": "thief-ant", "common_name_en": "Thief ant", "common_name_es": "Hormiga ladrona", "scientific_name": "Solenopsis molesta", "aliases_en": [ "grease ant" ], "aliases_es": [ "hormiga de grasa" ], "category": "ants", "category_name": "Ants", "size_mm": [ 1.3, 1.8 ], "identification_confidence": "expert", "confidence_note": "Separating thief ants from pharaoh ants needs magnification; the antennal club segment count is the deciding feature.", "diagnostic_features": [ "Among the smallest household ants at under 2 mm, pale yellow to light brown.", "The antennal club has two segments, against three in the similar-looking pharaoh ant — this requires a hand lens or microscope and is the reliable separator.", "Two nodes on the waist and very small eyes." ], "evidence_left": [ "Trails to greasy and protein-rich foods rather than to sweets.", "Nests in wall voids, in soil, and often adjacent to other ant colonies whose brood they raid." ], "distribution": "Widespread across the United States.", "biology": "Named for nesting close to other ant colonies and stealing their brood and food. Their extremely small size lets them enter sealed packaging.\n", "prevention": [ "Store protein and grease-rich foods in rigid sealed containers rather than in original packaging.", "Clean grease residue from ranges, extractor filters, and cabinet surfaces." ], "confused_with": [ "pharaoh-ant", "little-black-ant" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Correct identification against pharaoh ant decides the approach, and that determination needs magnification first.", "health_flag": null, "url": "https://againstpest.shop/identify/ants/thief-ant/", "same_as": [] }, { "id": "harvester-ant", "common_name_en": "Harvester ant", "common_name_es": "Hormiga cosechadora", "scientific_name": "Pogonomyrmex spp.", "aliases_en": [ "red harvester ant" ], "aliases_es": [ "hormiga recolectora" ], "category": "ants", "category_name": "Ants", "size_mm": [ 5, 10 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Large at 5 to 10 mm, red to reddish-brown, with a conspicuous fringe of long hairs beneath the head forming a beard-like structure called a psammophore.", "Nests are surrounded by a cleared, vegetation-free disc of bare ground, often with a gravel-covered surface and a single obvious entrance.", "Workers carry seeds along well-defined foraging trails radiating from the nest." ], "evidence_left": [ "A distinctly bare circular clearing around the nest entrance, unlike the fire ant's vegetated dome.", "Seed husks accumulated near the entrance." ], "distribution": "Western and southwestern United States, extending into the Great Plains.", "biology": "Seed-harvesting ants of open arid ground. They sting painfully when the nest is disturbed but are not building-invading pests, and several species are ecologically important — including as the primary food of the threatened Texas horned lizard.\n", "prevention": [ "Site play areas and paths away from established nests rather than removing colonies that pose no structural threat." ], "confused_with": [ "red-imported-fire-ant" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Rarely a structural or indoor pest, and ecologically valuable; identification usually ends the question.", "health_flag": null, "url": "https://againstpest.shop/identify/ants/harvester-ant/", "same_as": [] }, { "id": "german-cockroach", "common_name_en": "German cockroach", "common_name_es": "Cucaracha alemana", "scientific_name": "Blattella germanica", "aliases_en": [ "croton bug" ], "aliases_es": [ "cucaracha rubia" ], "category": "cockroaches", "category_name": "Cockroaches", "size_mm": [ 13, 16 ], "identification_confidence": "field", "confidence_note": "The paired pronotal stripes are decisive and visible without magnification.", "diagnostic_features": [ "Two dark parallel stripes run front to back on the pronotum, the shield-like plate behind the head. This is the single decisive feature.", "Adults are small at 13 to 16 mm, light tan to medium brown — much smaller than an American cockroach.", "Nymphs are nearly black with a pale stripe down the back and are wingless, and their presence indoors confirms a breeding population rather than a stray.", "Adults have fully developed wings that reach the tip of the abdomen, but they rarely fly and are usually seen running rather than in flight.", "Egg cases are pale brown, purse-shaped, and about 8 mm, and the female carries hers until shortly before hatching." ], "evidence_left": [ "Live insects visible in daylight, which indicates a population large enough that harbourage is saturated.", "Dark peppery fecal specks in cabinet corners, along hinges, and inside appliance housings.", "A distinctive musty odour in heavy infestations.", "Shed skins and empty egg cases in cracks near food and warmth." ], "distribution": "Throughout the United States, essentially always indoors and strongly concentrated in multi-unit housing, food service, and institutional settings.", "biology": "This is the mechanism that explains why sanitation alone rarely finishes the job. A German cockroach female produces an egg case holding roughly 30 to 40 eggs and carries it until hatching, which protects the brood; the species completes a generation in as little as two months under warm indoor conditions. A population therefore rebuilds from a small surviving remnant faster than most people expect, and any approach that kills the visible adults while leaving harbourage and food intact will appear to work for several weeks and then fail. They also aggregate in tight, warm cracks near food and water, which is why the insects you see are a small fraction of the population. In multi-unit buildings they move between units through shared plumbing and wall voids, so a single-unit response is usually temporary.\n", "prevention": [ "Eliminate harbourage — the tight cracks and voids the population lives in — by sealing cabinet gaps, appliance housings, and the voids behind them.", "Remove food and moisture access completely, including pet food left out, grease films, and drips under sinks.", "Reduce clutter, especially cardboard and paper bags, which is prime harbourage.", "In a rental, report it to the landlord in writing immediately; a building-wide response is the only kind that works." ], "confused_with": [ "brown-banded-cockroach", "american-cockroach" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Reproductive rate, harbourage behaviour, and movement between units in multi-unit housing mean an established German cockroach population genuinely needs a coordinated professional approach. Correcting sanitation and harbourage is necessary and does real work, but is rarely sufficient on its own once the population is established.\n", "health_flag": null, "url": "https://againstpest.shop/identify/cockroaches/german-cockroach/", "same_as": [ "https://en.wikipedia.org/wiki/German_cockroach", "https://www.wikidata.org/wiki/Q13901" ] }, { "id": "american-cockroach", "common_name_en": "American cockroach", "common_name_es": "Cucaracha americana", "scientific_name": "Periplaneta americana", "aliases_en": [ "palmetto bug", "water bug", "sewer roach" ], "aliases_es": [ "cucaracha roja", "cucaracha de agua" ], "category": "cockroaches", "category_name": "Cockroaches", "size_mm": [ 34, 53 ], "identification_confidence": "field", "confidence_note": "Size alone nearly settles it; the pale pronotal margin confirms.", "diagnostic_features": [ "Very large at 34 to 53 mm, the largest cockroach commonly found in US homes.", "Reddish-brown overall with a pale yellowish band forming a rough figure-eight or margin pattern around the edge of the pronotum.", "Adults of both sexes have fully developed wings and can glide, particularly in warm conditions.", "Nymphs are uniformly reddish-brown and lack the German cockroach's pale dorsal stripe." ], "evidence_left": [ "Individual large insects appearing at night in bathrooms, kitchens, and basements, often near a floor drain.", "Droppings roughly 2 mm long, blunt-ended and ridged along the sides, larger and more cylindrical than mouse droppings.", "Dark, irregular egg cases about 8 mm glued to surfaces in damp areas." ], "distribution": "Throughout the United States, most abundant in the Southeast and in Gulf Coast states; strongly associated with sewers, steam tunnels, and moist basements.", "biology": "Despite the name this is primarily an outdoor and sewer-associated insect in most of the country, entering buildings through drains, sump pits, and gaps at grade. That distinction matters: sightings usually indicate an entry route and a moisture condition rather than an established indoor breeding population, which is the opposite of what a German cockroach sighting means. In Gulf Coast states they also live outdoors in palms and leaf litter, which is where the name \"palmetto bug\" comes from.\n", "prevention": [ "Fit and maintain drain covers, and keep floor-drain and sump traps filled so the sewer route is closed.", "Seal gaps at grade level, around utility penetrations, and beneath exterior doors.", "Correct basement and crawl space moisture, which is what makes the interior habitable.", "Clear leaf litter, mulch, and debris away from the foundation." ], "confused_with": [ "oriental-cockroach", "smoky-brown-cockroach", "german-cockroach" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Sightings usually mean an entry route from outdoors or a drain rather than an indoor population. Closing the route and correcting moisture resolves most American cockroach complaints without any treatment.\n", "health_flag": null, "url": "https://againstpest.shop/identify/cockroaches/american-cockroach/", "same_as": [ "https://en.wikipedia.org/wiki/American_cockroach", "https://www.wikidata.org/wiki/Q133163" ] }, { "id": "oriental-cockroach", "common_name_en": "Oriental cockroach", "common_name_es": "Cucaracha oriental", "scientific_name": "Blatta orientalis", "aliases_en": [ "water bug", "black beetle" ], "aliases_es": [ "cucaracha negra" ], "category": "cockroaches", "category_name": "Cockroaches", "size_mm": [ 22, 30 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Very dark, almost glossy black to deep reddish-brown, noticeably darker than any other common house cockroach.", "Females have only small wing pads and cannot fly; males have wings covering about three-quarters of the abdomen. Neither flies.", "Body is broad and somewhat flattened, 22 to 30 mm — between German and American cockroaches in size.", "Movement is slow and clumsy compared with other species." ], "evidence_left": [ "Insects found in basements, crawl spaces, floor drains, and window wells, generally at or below grade.", "A strong musty odour associated with the harbourage area." ], "distribution": "Across the northern and central United States and at higher elevations elsewhere; more cold-tolerant than other house cockroaches.", "biology": "Strongly tied to cool, damp locations at or below grade — drains, sump pits, crawl spaces, and leaf litter against a foundation. They tolerate cooler conditions than other species, which is why they are the basement cockroach in northern states.\n", "prevention": [ "Correct standing water and chronic damp in basements and crawl spaces — this is the controlling factor.", "Keep drain traps filled and fit covers on floor drains.", "Remove leaf litter and dense ground cover from against the foundation.", "Seal gaps at grade, around window wells, and at utility entries." ], "confused_with": [ "american-cockroach", "smoky-brown-cockroach" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Moisture and grade-level entry govern this species almost entirely; correcting both resolves most complaints.", "health_flag": null, "url": "https://againstpest.shop/identify/cockroaches/oriental-cockroach/", "same_as": [ "https://en.wikipedia.org/wiki/Oriental_cockroach" ] }, { "id": "brown-banded-cockroach", "common_name_en": "Brown-banded cockroach", "common_name_es": "Cucaracha de bandas marrones", "scientific_name": "Supella longipalpa", "aliases_en": [ "furniture cockroach" ], "aliases_es": [ "cucaracha de muebles" ], "category": "cockroaches", "category_name": "Cockroaches", "size_mm": [ 10, 14.5 ], "identification_confidence": "field", "confidence_note": "The transverse banding separates it from the German cockroach's longitudinal stripes — a common and consequential mix-up.", "diagnostic_features": [ "Two pale transverse bands run across the wings and abdomen, running side to side. The German cockroach's stripes run front to back on the pronotum instead, and this is the key separator.", "Small at 10 to 14.5 mm, light brown to tan.", "Males have full wings and fly readily when disturbed; females have shorter wings and do not fly.", "Egg cases are small, reddish-brown, and glued in clusters to undersides of furniture and inside electronics." ], "evidence_left": [ "Egg cases attached beneath tables, chairs, shelving, and inside appliance and electronics housings.", "Activity distributed throughout a building rather than concentrated near kitchens and bathrooms." ], "distribution": "Throughout the United States, more commonly reported in the South.", "biology": "Unlike the German cockroach this species does not concentrate near water, so it spreads through bedrooms, living rooms, and offices — inside picture frames, clocks, televisions, and upholstered furniture. Inspection focused on the kitchen will miss it entirely, which is why the mix-up with German cockroaches matters.\n", "prevention": [ "Inspect and treat the whole building rather than only kitchens and bathrooms.", "Check second-hand furniture and electronics carefully before bringing them in.", "Reduce clutter throughout, particularly cardboard and paper storage." ], "confused_with": [ "german-cockroach" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "The building-wide distribution makes thorough inspection difficult, and a kitchen-focused response reliably misses the population.\n", "health_flag": null, "url": "https://againstpest.shop/identify/cockroaches/brown-banded-cockroach/", "same_as": [ "https://en.wikipedia.org/wiki/Brown-banded_cockroach" ] }, { "id": "smoky-brown-cockroach", "common_name_en": "Smoky brown cockroach", "common_name_es": "Cucaracha marrón ahumada", "scientific_name": "Periplaneta fuliginosa", "aliases_en": [ "smokybrown" ], "aliases_es": [ "cucaracha ahumada" ], "category": "cockroaches", "category_name": "Cockroaches", "size_mm": [ 25, 38 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Uniform dark mahogany to near-black with a glossy sheen, and — importantly — no pale margin on the pronotum, which separates it from the American cockroach.", "Large at 25 to 38 mm, with wings extending beyond the tip of the abdomen in both sexes.", "Strong flier, readily attracted to lights at night." ], "evidence_left": [ "Insects around porch lights, in gutters, and in attics and soffits.", "Activity concentrated in the upper part of a structure rather than in basements." ], "distribution": "Southeastern United States and Gulf Coast, extending up the Atlantic coast.", "biology": "Loses moisture rapidly and so depends on consistently humid harbourage — tree holes, mulch, leaf litter, roof gutters, and attics. Entry is usually from above via the roofline rather than at grade, which is the opposite of the Oriental cockroach and changes where you look.\n", "prevention": [ "Clear gutters and correct roofline drainage, which is the principal harbourage.", "Screen attic and soffit vents and seal gaps at the roofline.", "Reduce mulch depth and move woodpiles away from the structure.", "Switch exterior lighting to fixtures that attract fewer insects, or reposition them away from doors." ], "confused_with": [ "american-cockroach", "oriental-cockroach" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Habitat and roofline entry govern this species; gutter, vent, and moisture work addresses it directly.", "health_flag": null, "url": "https://againstpest.shop/identify/cockroaches/smoky-brown-cockroach/", "same_as": [] }, { "id": "subterranean-termite-swarmer", "common_name_en": "Subterranean termite (swarmer)", "common_name_es": "Termita subterránea (alada)", "scientific_name": "Reticulitermes spp.", "aliases_en": [ "flying termite", "white ant", "alate", "swarmer" ], "aliases_es": [ "termita voladora", "comején", "alada" ], "category": "termites", "category_name": "Termites", "size_mm": [ 6, 10 ], "identification_confidence": "field", "confidence_note": "The swarmer-versus-flying-ant distinction is reliable for a careful non-expert and is the highest-value identification on this site.\n", "diagnostic_features": [ "The waist is broad and straight — the body reads as a single uniform tube with no pinch. A flying ant has a sharply pinched, narrow waist. This is the most reliable feature.", "All four wings are the same length and shape, and extend well past the tip of the abdomen. A flying ant's forewings are clearly longer than its hindwings.", "The antennae are straight and beaded like a tiny string of pearls, not elbowed. A flying ant's antennae bend sharply.", "Wings detach very easily, so piles of equal-length discarded wings on windowsills and in spider webs are often the first evidence found.", "Body is dark brown to black, 6 to 10 mm including wings." ], "evidence_left": [ "Pencil-width mud tubes on foundation walls, piers, and crawl space surfaces — the definitive subterranean termite sign.", "Piles of shed wings of equal length on windowsills, in spider webs, or near light fixtures, typically in spring.", "Wood that sounds hollow when tapped, and blistered or darkened paint over damaged areas.", "Damaged wood packed with soil, which distinguishes subterranean damage from the clean galleries of drywood termites." ], "distribution": "Every state except Alaska, with the greatest activity across the Southeast and the southern half of the country. Formosan subterranean termites are established along the Gulf Coast, in Hawaii, and in parts of California.", "biology": "This is the mechanism that explains why treating visible damage does not solve the problem. Subterranean colonies live in the soil, not in the wood they eat, and reach the structure through shelter tubes that protect them from drying out. The colony may be substantial and some distance from the damage you can see, so removing or repairing damaged wood addresses the symptom and leaves the colony intact. Swarming is a reproductive event from a mature colony — typically several years old — which is why swarmers indoors are a serious finding rather than a nuisance. Foraging is driven by moisture, so anything that keeps soil damp against the structure increases pressure.\n", "prevention": [ "Eliminate wood-to-soil contact — deck posts, fence rails, siding, and trim that reach the ground are direct entry routes.", "Correct drainage so water moves away from the foundation, and repair leaking taps, gutters, and downspouts.", "Keep crawl spaces ventilated and dry, and remove cellulose debris such as form boards, stumps, and buried scrap wood.", "Maintain a visible inspection gap between soil or mulch and the bottom of siding, so tubes cannot be built out of sight." ], "confused_with": [ "carpenter-ant", "drywood-termite" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "A colony in the soil cannot be assessed or addressed from inside the building, the damage is structural, and in a real-estate transaction a documented inspection is usually required. This is one of the clearest cases on the site where professional involvement is genuinely warranted.\n", "health_flag": null, "url": "https://againstpest.shop/identify/termites/subterranean-termite-swarmer/", "same_as": [ "https://en.wikipedia.org/wiki/Reticulitermes", "https://www.wikidata.org/wiki/Q1414010" ] }, { "id": "drywood-termite", "common_name_en": "Drywood termite", "common_name_es": "Termita de madera seca", "scientific_name": "Incisitermes spp. / Cryptotermes spp.", "aliases_en": [ "powderpost termite" ], "aliases_es": [ "termita de madera seca" ], "category": "termites", "category_name": "Termites", "size_mm": [ 8, 12 ], "identification_confidence": "field", "confidence_note": "The frass pellets are distinctive enough to identify to group with a hand lens.", "diagnostic_features": [ "Fecal pellets are the defining evidence — hard, elongated, roughly 1 mm, six-sided in cross-section with concave faces, and they range from pale cream to dark brown regardless of the wood colour.", "Pellets accumulate in small piles beneath tiny round kick-out holes, resembling coarse sand or pepper.", "Swarmers are larger than subterranean swarmers at 8 to 12 mm, and are typically pale to reddish-brown with a darker head.", "Galleries cut across the wood grain and are clean and smooth inside, with no soil packing — the opposite of subterranean damage." ], "evidence_left": [ "Piles of six-sided pellets on windowsills, in cupboards, and on floors beneath infested timber.", "Small round kick-out holes about 1 to 2 mm in the wood surface.", "No mud tubes anywhere, which effectively rules out subterranean termites." ], "distribution": "A coastal and southern band — California, Arizona, the Gulf Coast, Florida, the Southeast coastal plain, and Hawaii. Largely absent from the interior and northern states.", "biology": "Drywood termites live entirely inside the wood they eat and need no soil contact and no external moisture source, which is why they infest furniture, picture frames, structural timber, and even wooden objects moved between buildings. Colonies are much smaller than subterranean colonies and grow slowly, so damage accumulates over years. Because there is no soil connection, the entire approach to them differs from subterranean termites — which is precisely why confusing the two wastes time and money.\n", "prevention": [ "Screen attic and foundation vents with fine mesh to block swarmer entry.", "Maintain paint and sealant on exposed wood, since swarmers enter through checks and cracks in bare timber.", "Inspect second-hand wooden furniture before bringing it indoors.", "Store firewood and lumber away from the structure." ], "confused_with": [ "subterranean-termite-swarmer", "powderpost-beetle" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Locating every infested member inside finished construction is the hard part, and the extent determines what response is appropriate. Assessment is the professional task here.\n", "health_flag": null, "url": "https://againstpest.shop/identify/termites/drywood-termite/", "same_as": [ "https://en.wikipedia.org/wiki/Drywood_termite" ] }, { "id": "house-mouse", "common_name_en": "House mouse", "common_name_es": "Ratón doméstico", "scientific_name": "Mus musculus", "aliases_en": [ "field mouse", "common mouse" ], "aliases_es": [ "ratón casero" ], "category": "rodents", "category_name": "Rodents", "size_mm": [ 65, 95 ], "identification_confidence": "field", "confidence_note": "Droppings size and shape separate mice from rats reliably without seeing the animal.", "diagnostic_features": [ "Droppings are 3 to 6 mm, rod-shaped with pointed ends, and scattered widely rather than deposited in one place — a single mouse produces dozens per day.", "Body is 65 to 95 mm excluding the tail, with a tail roughly as long as the head and body combined.", "Ears are large and prominent relative to the head, eyes are small and black, and the muzzle is pointed.", "Fur is dusty grey-brown above with a slightly paler belly; the tail is thinly furred with visible rings." ], "evidence_left": [ "Small droppings along walls, in drawers, behind appliances, and inside cupboards.", "Gnaw marks about 2 mm wide on packaging, and shredded paper, insulation, or fabric gathered into a nest.", "Greasy dark rub marks along frequently used routes at floor level.", "Scratching or scurrying inside walls and ceilings at night." ], "distribution": "Throughout the United States.", "biology": "House mice pass through a hole about 6 mm across — roughly the diameter of a pencil — which is why exclusion has to be genuinely thorough to work. They range only a few metres from the nest, so evidence is a good guide to where the nest is. They breed year-round indoors, reaching maturity in about six weeks, so a small population becomes a large one quickly. They are also curious about new objects, which is the opposite of rat behaviour and changes how monitoring works.\n", "prevention": [ "Seal every gap of 6 mm or more, using a material mice cannot gnaw through — steel wool packed into the gap and sealed over, or metal mesh, rather than foam or caulk alone.", "Fit door sweeps, and check where pipes, cables, and dryer vents pass through walls.", "Store dry food, pet food, and birdseed in rigid sealed containers.", "Remove nesting material and clear clutter from garages, basements, and storage areas." ], "confused_with": [ "deer-mouse", "norway-rat" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Exclusion is genuinely the controlling factor for house mice, it is inexpensive, and it is the only measure that stops recurrence. A response that removes animals without sealing the entry points reliably repeats.\n", "health_flag": null, "url": "https://againstpest.shop/identify/rodents/house-mouse/", "same_as": [ "https://en.wikipedia.org/wiki/House_mouse", "https://www.wikidata.org/wiki/Q35517" ] }, { "id": "deer-mouse", "common_name_en": "Deer mouse", "common_name_es": "Ratón de campo", "scientific_name": "Peromyscus maniculatus", "aliases_en": [ "white-footed mouse" ], "aliases_es": [ "ratón patiblanco" ], "category": "rodents", "category_name": "Rodents", "size_mm": [ 70, 100 ], "identification_confidence": "field", "confidence_note": "The sharply bicoloured tail and white underside are reliable field features, and this identification matters because of hantavirus.\n", "diagnostic_features": [ "Sharply two-toned colouring — brown to greyish above with a crisply white belly, feet, and underside, with a clean dividing line rather than a gradual blend.", "The tail is distinctly bicoloured, dark above and white below, which the house mouse's uniformly greyish tail is not.", "Eyes are large and prominent, and ears are large and thinly furred.", "The body measures 70 to 100 mm excluding the tail, making it slightly larger and longer-legged than a house mouse seen alongside it." ], "evidence_left": [ "Nests of shredded plant material in outbuildings, cabins, sheds, vehicles, and stored equipment.", "Caches of seeds and nuts in enclosed spaces.", "Droppings similar in size to house mouse droppings and not reliably distinguishable by eye." ], "distribution": "Across most of the United States, predominantly in rural, wooded, and grassland settings rather than dense urban areas.", "biology": "Deer mice are the primary reservoir of Sin Nombre hantavirus in North America, which causes hantavirus pulmonary syndrome. Infection risk is associated with breathing dust from disturbed nests, droppings, and urine in enclosed spaces — cabins, sheds, crawl spaces, and stored vehicles that have been closed up. That is the entire reason this identification matters to a homeowner, and it changes how a contaminated space should be handled: ventilate before entering and do not dry-sweep or vacuum the material.\n", "prevention": [ "Ventilate closed outbuildings and cabins for at least 30 minutes before entering and cleaning.", "Never dry-sweep or vacuum rodent droppings or nests; consult CDC guidance on wetting the material before removal.", "Exclude with the same 6 mm standard used for house mice.", "Keep stored feed and seed in sealed rigid containers and clear brush away from outbuildings." ], "confused_with": [ "house-mouse" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Hantavirus risk makes cleanup of a contaminated enclosed space a health matter rather than a housekeeping one. Follow CDC guidance, and get help for a heavily contaminated building.\n", "health_flag": "hantavirus", "url": "https://againstpest.shop/identify/rodents/deer-mouse/", "same_as": [ "https://en.wikipedia.org/wiki/Peromyscus_maniculatus" ] }, { "id": "norway-rat", "common_name_en": "Norway rat", "common_name_es": "Rata parda", "scientific_name": "Rattus norvegicus", "aliases_en": [ "brown rat", "sewer rat", "common rat" ], "aliases_es": [ "rata noruega", "rata de alcantarilla" ], "category": "rodents", "category_name": "Rodents", "size_mm": [ 200, 250 ], "identification_confidence": "field", "confidence_note": "Tail-to-body ratio separates Norway from roof rats decisively.", "diagnostic_features": [ "The tail is shorter than the head and body combined — laid back along the animal it does not reach the shoulders. This separates it from the roof rat.", "Heavy-bodied and blunt-nosed, 200 to 250 mm excluding tail, with small ears that do not reach the eyes when folded forward.", "Fur is coarse, brown to grey-brown above with a paler grey underside.", "Droppings are 18 to 20 mm with blunt, rounded ends — capsule-shaped, and about three times the length of mouse droppings." ], "evidence_left": [ "Burrows 50 to 100 mm across in soil next to foundations, under slabs, beneath decking, and along fence lines.", "Well-worn runways with dark greasy rub marks along walls at floor level.", "Gnaw marks about 4 mm wide, and damage to wiring, plastic pipe, and structural material." ], "distribution": "Throughout the United States, concentrated in urban areas, ports, and near waterways and sewers.", "biology": "Norway rats are ground-dwelling and burrow, so they occupy basements, crawl spaces, sewers, and the ground floor rather than the attic. They are strongly neophobic — genuinely wary of new objects in their environment, which is the opposite of mouse behaviour and means monitoring devices are often ignored for days. They pass through a gap of about 20 mm and gnaw through many materials, so exclusion has to use resistant materials.\n", "prevention": [ "Seal gaps of 20 mm or more using metal mesh, sheet metal, or mortar rather than foam or plastic.", "Remove harbourage — dense ground cover, woodpiles, stored material against walls, and neglected outbuildings.", "Secure refuse in rigid bins with tight lids, and manage compost, fallen fruit, and pet food outdoors.", "Fit covers on floor drains and repair broken sewer laterals, which are a common and overlooked route." ], "confused_with": [ "roof-rat", "house-mouse" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Established rat populations damage structure and wiring, carry genuine health risk, and usually extend beyond one property. Exclusion is essential and does the lasting work, but an established population normally needs coordinated help as well.\n", "health_flag": null, "url": "https://againstpest.shop/identify/rodents/norway-rat/", "same_as": [ "https://en.wikipedia.org/wiki/Brown_rat", "https://www.wikidata.org/wiki/Q26130" ] }, { "id": "roof-rat", "common_name_en": "Roof rat", "common_name_es": "Rata de tejado", "scientific_name": "Rattus rattus", "aliases_en": [ "black rat", "ship rat", "fruit rat" ], "aliases_es": [ "rata negra", "rata de barco" ], "category": "rodents", "category_name": "Rodents", "size_mm": [ 160, 205 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "The tail is longer than the head and body combined — laid back it reaches past the shoulders. This is the decisive separator from the Norway rat.", "Slender and pointed-nosed, 160 to 205 mm excluding tail, noticeably lighter in build than a Norway rat.", "Ears are large and thin, reaching the eyes when folded forward.", "Droppings are 12 to 13 mm with pointed ends, more spindle-shaped than the Norway rat's blunt capsules." ], "evidence_left": [ "Activity overhead — noises in attics, ceilings, and soffits rather than in basements.", "Damage to fruit on trees, and hollowed citrus left hanging.", "Runways along utility lines, fence tops, and tree branches contacting the roof." ], "distribution": "Coastal and southern states — the Pacific coast, the Gulf Coast, Florida, and the Southeast, plus Hawaii. Largely absent from the northern interior.", "biology": "Roof rats are agile climbers that live above ground, which is why they occupy attics and upper storeys while Norway rats occupy basements. They travel along branches, utility lines, and fence tops, so the entry route is usually at the roofline. Like Norway rats they are wary of new objects.\n", "prevention": [ "Trim tree limbs back at least 1.2 m from the roof and remove vines climbing walls.", "Seal roofline gaps, screen vents and eaves, and cap chimneys.", "Harvest fruit promptly and clear fallen fruit and nuts.", "Secure attic access points and check where utility lines enter." ], "confused_with": [ "norway-rat" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Roofline access points are difficult and often unsafe to inspect and seal properly, and an attic population damages wiring and insulation.", "health_flag": null, "url": "https://againstpest.shop/identify/rodents/roof-rat/", "same_as": [ "https://en.wikipedia.org/wiki/Black_rat" ] }, { "id": "bed-bug", "common_name_en": "Bed bug", "common_name_es": "Chinche de cama", "scientific_name": "Cimex lectularius", "aliases_en": [ "bedbug", "mahogany flat" ], "aliases_es": [ "chinche", "chinches de cama" ], "category": "bed-bugs", "category_name": "Bed bugs", "size_mm": [ 4, 5 ], "identification_confidence": "field", "confidence_note": "Adult bed bugs are identifiable with care. Eggs and first-stage nymphs are close to invisible without magnification, so an inspection that finds nothing is not proof of absence.\n", "diagnostic_features": [ "Adults are 4 to 5 mm, roughly the size and shape of an apple seed — flat and oval when unfed, swollen and elongated to nearly cylindrical after feeding.", "Colour is mahogany to reddish-brown, becoming darker and redder after a blood meal.", "The body is wingless with short, thick antennae and a distinctly flattened profile that lets it occupy very narrow seams.", "The abdomen has visible horizontal ridges giving a segmented, banded appearance across the back.", "Nymphs are smaller and translucent to pale yellow-white, becoming visible mainly after feeding when a red blood spot shows through." ], "evidence_left": [ "Dark, ink-like fecal spotting along mattress seams, in the box spring frame, along headboard joints, and behind loose wallpaper. The spots bleed slightly into fabric like a felt-tip pen mark, which distinguishes them from ordinary dirt.", "Shed skins — pale, empty, adult-shaped husks — accumulated in harbourage areas. These are often the easiest evidence to find.", "Eggs about 1 mm, pearly white, cemented into crevices in small groups.", "A sweet, musty odour in heavily infested rooms." ], "distribution": "Throughout the United States in every kind of housing and lodging, with the greatest burden falling on multi-unit rental housing.", "biology": "Bed bugs feed on blood, usually at night, and spend the rest of the time hidden in tight seams and crevices close to where people sleep. This harbourage behaviour explains why a single surface spray application fails: the population is inside mattress seams, bed frame joints, and behind skirting, not on the open surfaces that get treated. They survive long periods without feeding, so leaving a room empty does not clear it. They are not associated with dirt or poor housekeeping — a clean home is as susceptible as any other, and clutter matters only because it creates more places to hide. They are not known to transmit disease to people, which is a genuinely important thing to know for anyone frightened by an infestation.\n", "prevention": [ "Encase the mattress and box spring in a purpose-made bed bug encasement and leave it on — this traps anything inside and removes the most difficult harbourage from the problem.", "Launder bedding and clothing and dry on the hottest setting the fabric tolerates; the dryer, not the wash, is what does the work.", "Inspect luggage and second-hand furniture, and keep luggage off beds and floors when travelling.", "Reduce clutter around the bed and pull the bed away from walls where practical." ], "confused_with": [ "carpet-beetle", "bat-bug" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "Harbourage behaviour puts most of the population out of reach of anything a resident can do, and failed partial attempts spread the infestation. This is also where the two most dangerous DIY practices occur — flammable liquids applied as a treatment, and improvised heating — both of which have caused fatal fires.\n", "health_flag": null, "url": "https://againstpest.shop/identify/bed-bugs/bed-bug/", "same_as": [ "https://en.wikipedia.org/wiki/Bed_bug", "https://www.wikidata.org/wiki/Q28147" ] }, { "id": "bat-bug", "common_name_en": "Bat bug", "common_name_es": "Chinche de murciélago", "scientific_name": "Cimex adjunctus", "aliases_en": [ "bat bed bug" ], "aliases_es": [ "chinche de murciélagos" ], "category": "bed-bugs", "category_name": "Bed bugs", "size_mm": [ 4, 5 ], "identification_confidence": "expert", "confidence_note": "Bat bugs and bed bugs are separated by the length of hairs on the pronotum, which needs a microscope. This is exactly the case where a specimen should go to an extension entomology lab — and the distinction changes everything, because the real problem is a bat roost.\n", "diagnostic_features": [ "Essentially identical to a bed bug in size, colour, and flattened oval shape at normal viewing distance.", "The fringe hairs along the edge of the pronotum are longer than the width of an eye, against shorter than an eye width in the bed bug. This requires magnification and is the only reliable separator.", "Found in association with attics, chimneys, wall voids, and light fixtures rather than concentrated around beds." ], "evidence_left": [ "Insects appearing at ceiling level, around light fixtures, or dropping from above.", "Signs of a bat roost — guano accumulations, staining at gaps in the roofline, or noises at dusk." ], "distribution": "Across the United States wherever bats roost in structures, most commonly reported in the Midwest and East.", "biology": "Bat bugs feed primarily on bats and move into living space when the bat colony leaves or is excluded. Treating them as bed bugs misses the point entirely: the source is the roost. Bat exclusion is also regulated in many states because several bat species are protected and exclusion is prohibited during maternity season, which is a genuine legal constraint, not a formality.\n", "prevention": [ "Have the roost identified and addressed first; the insects follow the bats.", "Do not attempt bat exclusion without checking your state's protected-species rules and maternity-season restrictions." ], "confused_with": [ "bed-bug" ], "treatment_verdict": "professional-required", "treatment_verdict_reason": "The underlying problem is a bat roost, and bat exclusion is legally restricted in most states during maternity season. Several bat species are protected under state and federal law.\n", "health_flag": "rabies-exposure", "url": "https://againstpest.shop/identify/bed-bugs/bat-bug/", "same_as": [] }, { "id": "brown-recluse", "common_name_en": "Brown recluse", "common_name_es": "Araña reclusa parda", "scientific_name": "Loxosceles reclusa", "aliases_en": [ "fiddleback spider", "violin spider" ], "aliases_es": [ "araña violinista", "araña marrón" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 6, 12 ], "identification_confidence": "expert", "confidence_note": "Brown recluses are among the most over-reported spiders in North America. The great majority of reports from outside the established range are something else, and the eye arrangement — not the violin mark — is the feature that decides it. Have a specimen identified before concluding.\n", "diagnostic_features": [ "Six eyes arranged in three pairs forming a semicircle, rather than the eight eyes of nearly all other spiders. This requires magnification and is the only reliable diagnostic feature.", "The legs are uniformly coloured with no bands, stripes, or spines — a banded or spiny-legged spider is not a recluse.", "The body is uniform tan to dark brown, 6 to 12 mm, with a leg span around 25 mm.", "A darker violin-shaped mark on the cephalothorax with the neck pointing backward is often present, but many harmless spiders have similar markings and some recluses show it faintly. Do not identify on this feature alone." ], "evidence_left": [ "Irregular, wispy sheet webbing in undisturbed storage, in boxes, and behind stored items — recluses do not build orb webs.", "Shed skins in undisturbed corners of basements, attics, and cupboards." ], "distribution": "A well-defined range across the central and southern Midwest and mid-South — broadly Kansas, Oklahoma, Texas, Arkansas, Louisiana, Missouri, Iowa, Nebraska, Illinois, Indiana, Kentucky, Tennessee, Mississippi, Alabama, and Georgia. Reports far outside this range are very frequently misidentified.\n", "biology": "Recluses are genuinely reclusive and bites are uncommon relative to how often they are blamed. Most bites occur when a spider is pressed against skin — in clothing, bedding, or gloves that have been stored undisturbed. Bite outcomes vary widely and most heal without intervention, but a minority produce a necrotic lesion. Many wounds diagnosed as recluse bites are later found to be other conditions, including infections, which is one reason a suspected bite belongs with a medical professional rather than a website.\n", "prevention": [ "Store clothing, shoes, and bedding in sealed containers rather than open boxes in garages, attics, and basements.", "Shake out stored clothing and footwear before use.", "Reduce clutter in undisturbed storage areas, which is the harbourage.", "Fit door sweeps and seal gaps at grade." ], "confused_with": [ "cellar-spider", "wolf-spider", "hobo-spider" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Identification is the whole question, and it is genuinely difficult. Most suspected recluses are not recluses. Confirm before doing anything else.\n", "health_flag": "medically-significant", "url": "https://againstpest.shop/identify/spiders/brown-recluse/", "same_as": [ "https://en.wikipedia.org/wiki/Brown_recluse_spider", "https://www.wikidata.org/wiki/Q194266" ] }, { "id": "black-widow", "common_name_en": "Black widow", "common_name_es": "Viuda negra", "scientific_name": "Latrodectus mactans and related species", "aliases_en": [ "southern black widow", "western black widow" ], "aliases_es": [ "araña viuda negra", "capulina" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 8, 13 ], "identification_confidence": "field", "confidence_note": "The mature female's combination of glossy black body and red ventral hourglass is reliable for a careful observer.", "diagnostic_features": [ "Mature females are glossy jet black with a red or orange hourglass marking on the underside of the abdomen — visible only from below, so the spider must be seen from underneath or in its web.", "The abdomen is distinctly globular and the body is 8 to 13 mm, with a leg span around 40 mm.", "Males and immatures look entirely different — smaller, paler, with white and reddish stripes or spots — and are not medically significant.", "The web is a strong, irregular, three-dimensional tangle rather than a flat orb, and is notably tough compared with other spider silk." ], "evidence_left": [ "Coarse, irregular tangle webs close to the ground in protected spaces — under outdoor furniture, in meter boxes, in woodpiles, under decking, in garages, and in undisturbed corners.", "Round, papery, cream-coloured egg sacs about 10 mm suspended in the web." ], "distribution": "Across the southern, western, and central United States; several Latrodectus species are present, with the southern black widow in the Southeast and the western black widow across the West.", "biology": "Black widows are not aggressive and bite defensively, usually when pressed against skin or when a web is disturbed by hand. Envenomation causes systemic effects — muscle cramping and pain rather than local tissue damage — and is treatable. Bites are rarely fatal in the United States but genuinely warrant medical evaluation, particularly for children and older adults.\n", "prevention": [ "Wear gloves when moving woodpiles, stored materials, and outdoor furniture that has stood undisturbed.", "Clear clutter and stored material from garages, sheds, crawl spaces, and along foundations.", "Fit tight-sealing covers on meter boxes and utility housings.", "Shake out gloves, boots, and stored items before use." ], "confused_with": [ "false-widow", "cellar-spider" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Identification and removing the harbourage generally settle it. A confirmed bite is a medical question, not a pest control one.\n", "health_flag": "medically-significant", "url": "https://againstpest.shop/identify/spiders/black-widow/", "same_as": [ "https://en.wikipedia.org/wiki/Latrodectus_mactans" ] }, { "id": "cellar-spider", "common_name_en": "Cellar spider", "common_name_es": "Araña de sótano", "scientific_name": "Pholcus phalangioides", "aliases_en": [ "daddy long-legs spider", "granddaddy long-legs" ], "aliases_es": [ "araña patona" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 7, 10 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Extremely long, thin, fragile legs — up to five or six times the body length — with a small, pale, elongated body.", "Colour is pale tan to grey, translucent, with a cylindrical abdomen.", "When disturbed in its web it vibrates rapidly, becoming a blur. This behaviour is characteristic.", "The web is an irregular, untidy tangle in ceiling corners, not an orb." ], "evidence_left": [ "Loose tangle webs accumulating in ceiling corners, basements, crawl spaces, and garages.", "Accumulated shed skins and prey remains beneath the web." ], "distribution": "Throughout the United States, almost entirely indoors and in protected structures.", "biology": "Harmless to people and a frequent predator of other spiders, including species of greater concern. Persistent webbing indicates available prey and undisturbed space rather than a problem in itself. The widely repeated claim that they are highly venomous but unable to bite through human skin has no scientific support.\n", "prevention": [ "Remove webs mechanically with a vacuum or broom; they rebuild only where prey is available.", "Reduce exterior lighting that concentrates flying insects near entrances.", "Correct basement and crawl space damp." ], "confused_with": [ "brown-recluse", "black-widow" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Harmless, and mechanical web removal plus reducing the insect prey supply resolves the complaint entirely.", "health_flag": null, "url": "https://againstpest.shop/identify/spiders/cellar-spider/", "same_as": [] }, { "id": "yellowjacket", "common_name_en": "Yellowjacket", "common_name_es": "Avispa chaqueta amarilla", "scientific_name": "Vespula spp. and Dolichovespula spp.", "aliases_en": [ "yellow jacket", "meat bee", "ground wasp" ], "aliases_es": [ "avispa amarilla", "chaqueta amarilla" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 10, 16 ], "identification_confidence": "field", "confidence_note": "The hairless, sharply patterned body separates wasps from bees reliably, and the distinction matters.", "diagnostic_features": [ "Bright, sharply defined yellow and black banding with a smooth, hairless, glossy body. A honey bee is fuzzy and duller golden-brown by comparison — this is the key separator.", "The waist is narrow and clearly pinched, and the wings fold longitudinally along the body at rest.", "Legs are tucked close to the body in flight, unlike a paper wasp's dangling legs.", "The body measures 10 to 16 mm, smaller and more compact than a paper wasp, with the abdomen tapering to a blunt point rather than a long stalk." ], "evidence_left": [ "Nests in the ground, in wall voids, in attics, and in dense shrubs, with a steady stream of traffic in and out of a single opening.", "Aggressive interest in food and drink outdoors in late summer, which honey bees do not show." ], "distribution": "Throughout the United States.", "biology": "Colonies grow through the season and peak in late summer and early autumn, which is when nearly all stings occur and when the insects switch to seeking sugars and protein from human food. They sting repeatedly rather than once, and disturbing a ground or wall-void nest triggers a coordinated defensive response. Colonies die off in winter in most of the country and the nest is not reused.\n", "prevention": [ "Keep refuse bins closed and clean, and cover food and sweet drinks outdoors in late summer.", "Check the ground and shrubs for traffic before mowing or trimming.", "Seal gaps at the roofline, in siding, and around utility entries in spring, before colonies establish." ], "confused_with": [ "honey-bee", "paper-wasp" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "A nest in a wall void or in the ground near an entrance is a genuine stinging hazard, defensive response is coordinated, and the risk is severe for anyone with a hymenoptera allergy.\n", "health_flag": "sting-allergy", "url": "https://againstpest.shop/identify/stinging-insects/yellowjacket/", "same_as": [ "https://en.wikipedia.org/wiki/Yellowjacket" ] }, { "id": "paper-wasp", "common_name_en": "Paper wasp", "common_name_es": "Avispa papelera", "scientific_name": "Polistes spp.", "aliases_en": [ "umbrella wasp" ], "aliases_es": [ "avispa de papel" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 16, 25 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Long, slender body with a very narrow waist, 16 to 25 mm, usually brown with yellow or reddish markings.", "The long back legs dangle conspicuously below the body in flight — this is the easiest field separator from a yellowjacket.", "The nest is a single open, downward-facing comb of exposed hexagonal cells, suspended by a narrow stalk, with no papery outer envelope." ], "evidence_left": [ "Open umbrella-shaped combs under eaves, in door frames, on porch ceilings, in grills, and inside meter boxes.", "A small number of adults resting directly on the visible comb." ], "distribution": "Throughout the United States.", "biology": "Colonies are much smaller than yellowjacket colonies — often a few dozen individuals — and paper wasps are markedly less defensive, generally stinging only when the nest is touched or approached very closely. They are useful predators of caterpillars. Nests in low-traffic locations frequently warrant no action at all.\n", "prevention": [ "Check eaves, door frames, and grills in early spring when nests are small and founding queens are alone.", "Screen or seal the openings of meter boxes, vents, and hollow structural sections." ], "confused_with": [ "yellowjacket", "mud-dauber" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Location decides it. A nest away from doors and traffic is generally best left alone; one at a doorway or in a play area needs a different answer.\n", "health_flag": "sting-allergy", "url": "https://againstpest.shop/identify/stinging-insects/paper-wasp/", "same_as": [] }, { "id": "honey-bee", "common_name_en": "Honey bee", "common_name_es": "Abeja melífera", "scientific_name": "Apis mellifera", "aliases_en": [ "honeybee" ], "aliases_es": [ "abeja de miel" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 12, 15 ], "identification_confidence": "field", "confidence_note": "Identifying a honey bee correctly is important because the right response is a beekeeper, not a pest treatment.", "diagnostic_features": [ "Body is densely covered in fine hairs, giving a fuzzy appearance, and the colouring is muted golden-brown to amber with darker bands rather than bright yellow.", "Broader and less sharply waisted than a wasp, 12 to 15 mm.", "Hind legs are broad and flattened and often carry visible packed pollen.", "Barbed sting, so a honey bee stings once and leaves the sting in place; wasps do not." ], "evidence_left": [ "A swarm — a dense hanging cluster of thousands of bees on a branch, fence, or wall — which is a temporary, generally docile stage while the colony seeks a new home.", "An established colony inside a wall or chimney, indicated by steady two-way traffic at a single gap and sometimes by wax or honey staining." ], "distribution": "Throughout the United States, both managed and feral.", "biology": "Honey bees are pollinators of substantial agricultural importance and are not a pest species. A swarm is usually temporary and often moves on within a day or two. A colony established inside a structure is a different matter and needs removal of the comb as well as the bees, because abandoned comb and honey attract other pests and can damage the building. Many areas have beekeepers who collect swarms at no cost, and killing a colony inside a wall without removing the comb reliably causes a secondary problem.\n", "prevention": [ "Seal gaps at the roofline, in siding, and around chimneys and vents in early spring before scouts locate the cavity.", "Cap unused chimneys and screen vents." ], "confused_with": [ "yellowjacket", "bumble-bee", "carpenter-bee" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "The correct response is a beekeeper or a live-removal specialist, not a pest treatment. A colony inside a structure needs the comb removed as well as the bees.\n", "health_flag": null, "url": "https://againstpest.shop/identify/stinging-insects/honey-bee/", "same_as": [ "https://en.wikipedia.org/wiki/Western_honey_bee" ] }, { "id": "carpenter-bee", "common_name_en": "Carpenter bee", "common_name_es": "Abeja carpintera", "scientific_name": "Xylocopa spp.", "aliases_en": [ "wood bee", "boring bee" ], "aliases_es": [ "abejorro carpintero" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 12, 25 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "The top of the abdomen is shiny, black, and hairless — this is the decisive separator from a bumble bee, whose abdomen is densely furry.", "Large and robust at 12 to 25 mm, with a fuzzy yellow thorax.", "Males hover aggressively near nest sites and cannot sting at all; females can sting but rarely do." ], "evidence_left": [ "Perfectly round entry holes about 12 mm in diameter in bare softwood — fascia, eaves, decking, railings, and outdoor furniture.", "Coarse sawdust beneath the hole and yellowish staining on the wood below it.", "Buzzing and hovering activity around eaves in spring." ], "distribution": "Throughout the United States, most commonly reported in the South and East.", "biology": "Carpenter bees excavate galleries in wood to nest rather than eating it, strongly preferring bare, unpainted, weathered softwood. Individual galleries are extended year after year, and cumulative damage over many seasons can become structurally meaningful. Woodpeckers enlarging galleries to reach larvae often cause more visible damage than the bees. They are also effective pollinators.\n", "prevention": [ "Paint or varnish exposed softwood — they strongly prefer bare weathered wood, and a maintained finish is genuinely effective.", "Fill and finish existing galleries in autumn after activity ends.", "Use hardwood or finished material for new trim, railings, and outdoor furniture." ], "confused_with": [ "bumble-bee", "honey-bee" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Maintaining a painted or sealed finish on exposed softwood addresses carpenter bees directly, and they are valuable pollinators.\n", "health_flag": null, "url": "https://againstpest.shop/identify/stinging-insects/carpenter-bee/", "same_as": [] }, { "id": "blacklegged-tick", "common_name_en": "Blacklegged tick", "common_name_es": "Garrapata de patas negras", "scientific_name": "Ixodes scapularis", "aliases_en": [ "deer tick" ], "aliases_es": [ "garrapata del venado" ], "category": "ticks", "category_name": "Ticks", "size_mm": [ 1, 3 ], "identification_confidence": "expert", "confidence_note": "Nymphs — the stage responsible for most disease transmission — are about the size of a poppy seed and are genuinely difficult to identify. Many state health departments and extension services offer tick identification.\n", "diagnostic_features": [ "Adult females have a solid dark reddish-orange abdomen with a distinct solid black shield behind the head, and no white markings or ornamentation.", "The legs are dark, almost black, which is the source of the name.", "Adults are 3 to 5 mm unfed; nymphs are 1 to 2 mm and roughly poppy-seed sized, which is why they go unnoticed.", "The mouthparts are long and clearly visible from above, projecting forward beyond the body outline." ], "evidence_left": [ "Ticks found attached after time in wooded areas, leaf litter, or tall grass at woodland edges.", "Peak nymph activity in late spring and early summer." ], "distribution": "The Northeast, mid-Atlantic, upper Midwest, and parts of the Southeast; the closely related western blacklegged tick occupies the Pacific coast.", "biology": "This is the principal vector of Lyme disease in North America, and also transmits anaplasmosis and babesiosis. Transmission risk rises with attachment time, which is the entire reason prompt tick checks and correct removal matter more than anything else. Nymphs cause most human cases because they are small enough to escape notice. Consult CDC guidance for removal technique and for what symptoms warrant medical attention.\n", "prevention": [ "Check thoroughly after time outdoors, including scalp, waistline, and behind knees; prompt removal is the single most effective measure.", "Keep a mown border and a barrier of wood chips or gravel between lawn and woodland edge, where ticks concentrate.", "Move play equipment and seating away from woodland edges and out of leaf litter.", "Remove leaf litter and clear tall grass around the house." ], "confused_with": [ "american-dog-tick", "lone-star-tick" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Personal protection, prompt tick checks, and yard-edge habitat management are what actually reduce risk. Area-wide treatment is not what decides individual exposure.\n", "health_flag": "disease-vector", "url": "https://againstpest.shop/identify/ticks/blacklegged-tick/", "same_as": [ "https://en.wikipedia.org/wiki/Ixodes_scapularis" ] }, { "id": "american-dog-tick", "common_name_en": "American dog tick", "common_name_es": "Garrapata americana del perro", "scientific_name": "Dermacentor variabilis", "aliases_en": [ "wood tick" ], "aliases_es": [ "garrapata de madera" ], "category": "ticks", "category_name": "Ticks", "size_mm": [ 3, 5 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "The shield behind the head carries conspicuous white or silvery mottled ornamentation, unlike the blacklegged tick's solid dark shield.", "Adults are larger and more rounded at 3 to 5 mm unfed, and distinctly brown.", "The mouthparts are short compared with the blacklegged tick." ], "evidence_left": [ "Ticks found after time in grassy fields, along trails, and in scrubby edge habitat rather than deep woodland.", "Peak activity in spring and early summer." ], "distribution": "East of the Rocky Mountains and in limited parts of the Pacific coast.", "biology": "A vector of Rocky Mountain spotted fever and tularemia, though not of Lyme disease. Correct species identification therefore changes which illnesses are plausible after a bite, which is why it matters clinically.\n", "prevention": [ "Stay to trail centres and avoid brushing through tall grass at field edges.", "Perform prompt tick checks on people and pets.", "Keep grass mown and clear brush along paths and property edges." ], "confused_with": [ "blacklegged-tick", "brown-dog-tick", "lone-star-tick" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Personal protection and habitat management at the yard edge address exposure directly.", "health_flag": "disease-vector", "url": "https://againstpest.shop/identify/ticks/american-dog-tick/", "same_as": [] }, { "id": "lone-star-tick", "common_name_en": "Lone star tick", "common_name_es": "Garrapata estrella solitaria", "scientific_name": "Amblyomma americanum", "aliases_en": [ "turkey tick" ], "aliases_es": [ "garrapata de la estrella" ], "category": "ticks", "category_name": "Ticks", "size_mm": [ 3, 5 ], "identification_confidence": "field", "confidence_note": "The female's single white dot is unmistakable; males and nymphs are harder.", "diagnostic_features": [ "Adult females carry a single conspicuous white or cream spot in the centre of the back — the \"lone star\" — which is unmistakable and needs no magnification.", "Males have faint white streaking or horseshoe-shaped markings around the rear margin instead of a single spot.", "Reddish-brown, rounded, 3 to 5 mm unfed, with long visible mouthparts." ], "evidence_left": [ "Ticks found in wooded and shrubby areas of the Southeast and lower Midwest.", "Notably aggressive host-seeking; this species actively approaches a host, which most ticks do not." ], "distribution": "The Southeast, lower Midwest, and mid-Atlantic, with the range expanding northward.", "biology": "Transmits ehrlichiosis and several other agents, and bites from this species are associated with alpha-gal syndrome — an acquired allergy to mammalian meat that can develop after a bite. That association is the main reason this identification matters to the public, and it is a genuinely unusual consequence worth knowing about.\n", "prevention": [ "Check promptly and thoroughly after time outdoors in the species' range.", "Maintain mown, clear borders between lawn and wooded or brushy areas." ], "confused_with": [ "american-dog-tick", "blacklegged-tick" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Prompt checks and edge habitat management are the measures that reduce exposure.", "health_flag": "disease-vector", "url": "https://againstpest.shop/identify/ticks/lone-star-tick/", "same_as": [] }, { "id": "carpet-beetle", "common_name_en": "Carpet beetle", "common_name_es": "Escarabajo de alfombra", "scientific_name": "Anthrenus spp. / Attagenus spp.", "aliases_en": [ "varied carpet beetle", "black carpet beetle" ], "aliases_es": [ "escarabajo de las alfombras" ], "category": "pantry-and-fabric", "category_name": "Pantry and fabric pests", "size_mm": [ 2, 5 ], "identification_confidence": "field", "confidence_note": "Carpet beetle larvae are frequently mistaken for bed bugs, and the distinction changes the answer completely.\n", "diagnostic_features": [ "Adults are small, rounded, almost domed beetles 2 to 5 mm, mottled in black, white, and orange scales, or uniformly black depending on species.", "Larvae are elongated, carrot-shaped, and densely covered in stiff bristles, often with a tuft of longer hairs at the rear — bed bugs are flat, oval, and hairless, which is the decisive difference.", "Larvae leave behind shed skins that retain the bristly shape, unlike the smooth flat husks bed bugs leave." ], "evidence_left": [ "Irregular grazed damage to wool, silk, feathers, and animal-based materials, often under furniture and along carpet edges.", "Bristly shed skins accumulating in undisturbed areas, in air vents, and beneath heavy furniture.", "Adults found at windowsills, since they fly toward light." ], "distribution": "Throughout the United States.", "biology": "Larvae feed on keratin — wool, silk, feathers, hair, and dried animal matter — while adults feed on pollen outdoors and enter through open windows or on cut flowers. Damage is done entirely by the larvae, so finding adults at a window is a signal to look for larvae elsewhere.\n", "prevention": [ "Vacuum thoroughly along carpet edges, beneath heavy furniture, and in air vents, which is where larvae concentrate.", "Store wool, silk, and fur items cleaned and sealed, since soiled fabric is far more attractive.", "Check for and remove bird or rodent nests in voids, which are a common larval food source.", "Screen windows and check cut flowers brought indoors." ], "confused_with": [ "bed-bug" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Thorough vacuuming and proper storage of animal-fibre materials address carpet beetles directly.", "health_flag": null, "url": "https://againstpest.shop/identify/pantry-and-fabric/carpet-beetle/", "same_as": [] }, { "id": "powderpost-beetle", "common_name_en": "Powderpost beetle", "common_name_es": "Escarabajo taladrador de la madera", "scientific_name": "Lyctinae and related subfamilies", "aliases_en": [ "lyctid beetle", "wood borer" ], "aliases_es": [ "escarabajo de la madera" ], "category": "wood-destroying-beetles", "category_name": "Wood-destroying beetles", "size_mm": [ 2, 7 ], "identification_confidence": "field", "confidence_note": "The flour-fine frass is the separator from drywood termites and is checkable with a fingertip.", "diagnostic_features": [ "The frass is extremely fine and talc-like, flowing freely like flour when disturbed — this is decisive against drywood termite pellets, which are hard and six-sided.", "Exit holes are small and round, 1 to 2 mm, resembling shot holes in the wood surface.", "Adults are small, narrow, flattened beetles 2 to 7 mm, reddish-brown to black.", "Damage is confined to hardwoods with large pores — oak, ash, hickory, walnut, and bamboo — and does not occur in softwood framing." ], "evidence_left": [ "Fine flour-like powder beneath small round holes in hardwood flooring, trim, furniture, and cabinetry.", "Fresh powder that reappears after cleaning, which indicates active infestation rather than old damage." ], "distribution": "Throughout the United States.", "biology": "Females lay into the open pores of hardwood, so only hardwoods with large vessels are susceptible and softwood framing is not at risk. Infestation usually arrives in the wood itself — in flooring, trim, or furniture — and the life cycle can take a year or more, which is why damage appears well after installation. Determining whether an infestation is still active matters more than the damage already visible.\n", "prevention": [ "Reduce indoor humidity, since low moisture content in wood limits development.", "Use finished or sealed hardwood, which blocks egg-laying into open pores.", "Inspect unfinished hardwood and bamboo items before bringing them in." ], "confused_with": [ "drywood-termite" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Establishing whether the infestation is active, and whether the wood is hardwood rather than framing, decides everything that follows.\n", "health_flag": null, "url": "https://againstpest.shop/identify/wood-destroying-beetles/powderpost-beetle/", "same_as": [] }, { "id": "wolf-spider", "common_name_en": "Wolf spider", "common_name_es": "Araña lobo", "scientific_name": "Lycosidae", "aliases_en": [ "ground spider" ], "aliases_es": [ "araña de suelo" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 10, 35 ], "identification_confidence": "field", "confidence_note": "Wolf spiders are the most common spider mistaken for a brown recluse, and the eye arrangement settles it immediately.", "diagnostic_features": [ "Eight eyes in three rows, with two very large forward-facing eyes that reflect light brightly under a torch. A recluse has six eyes in three pairs and no eyeshine.", "Robust, hairy, and often boldly patterned with stripes or chevrons; a recluse is uniformly coloured and not hairy.", "Legs are spiny and often banded, whereas recluse legs are smooth and uniform.", "Large at 10 to 35 mm and fast-moving on the ground; they build no capture web." ], "evidence_left": [ "Spiders running across floors, especially at night and in autumn as they move indoors.", "Females carrying a round egg sac attached to the spinnerets, or carrying spiderlings on the back — behaviour no other common spider shows." ], "distribution": "Throughout the United States.", "biology": "Active hunters that pursue prey rather than building webs, so their presence indoors reflects available insect prey and easy entry at floor level rather than an established colony. They bite only defensively and are not medically significant.\n", "prevention": [ "Fit door sweeps and seal gaps at grade, which is the entry route.", "Reduce exterior lighting near doors, which concentrates the insect prey.", "Clear heavy ground cover and debris against the foundation." ], "confused_with": [ "brown-recluse", "hobo-spider" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Harmless and entering at floor level; sealing and reducing prey attraction addresses it.", "health_flag": null, "url": "https://againstpest.shop/identify/spiders/wolf-spider/", "same_as": [] }, { "id": "hobo-spider", "common_name_en": "Hobo spider", "common_name_es": "Araña hobo", "scientific_name": "Eratigena agrestis", "aliases_en": [ "funnel weaver" ], "aliases_es": [ "araña de embudo" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 7, 14 ], "identification_confidence": "expert", "confidence_note": "Hobo spiders cannot be reliably separated from related funnel weavers without microscopic examination. Reports are also frequently made far outside the species' actual range.\n", "diagnostic_features": [ "Brown with a faint herringbone or chevron pattern along the abdomen, and uniformly coloured legs without distinct bands.", "Reliable separation from other funnel weavers requires microscopic examination of the genitalia — it cannot be done from a photograph.", "Builds a flat, horizontal sheet web with a funnel-shaped retreat at one edge, typically low down and in dark corners." ], "evidence_left": [ "Flat funnel webs in window wells, along foundation lines, in garages, and in basement corners.", "Fast-running spiders at floor level in late summer and autumn." ], "distribution": "The Pacific Northwest and parts of the northern Rocky Mountain states. Reports outside this region are almost always another species.", "biology": "Formerly listed as a spider of medical concern, the hobo spider's claimed role in necrotic lesions is not supported by current evidence and it has been removed from that classification by health authorities. Verify a suspected identification against your regional extension service.\n", "prevention": [ "Seal gaps at grade, in window wells, and along foundation lines.", "Reduce clutter and stored material in garages and basements." ], "confused_with": [ "brown-recluse", "wolf-spider" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Identification is unreliable outside a laboratory and the species is far less significant than its reputation suggests.", "health_flag": null, "url": "https://againstpest.shop/identify/spiders/hobo-spider/", "same_as": [] }, { "id": "false-widow", "common_name_en": "False widow", "common_name_es": "Falsa viuda", "scientific_name": "Steatoda spp.", "aliases_en": [ "cupboard spider", "closet spider" ], "aliases_es": [ "araña de armario" ], "category": "spiders", "category_name": "Spiders", "size_mm": [ 6, 11 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "Glossy dark brown to purplish-black with a globular abdomen, closely resembling a black widow at a glance.", "There is no red hourglass on the underside. A pale crescent or band often marks the front of the abdomen instead — this is the separator.", "Body 6 to 11 mm, slightly smaller and less glossy black than a mature female widow." ], "evidence_left": [ "Irregular tangle webs in sheds, garages, cupboards, and around window frames.", "Round cream egg sacs in the web, similar to a widow's." ], "distribution": "Widespread across the United States.", "biology": "Steatoda species are commonly killed in mistake for black widows. Bites are uncommon and not medically significant, and these spiders prey on widows where their ranges overlap.\n", "prevention": [ "Remove webbing mechanically and reduce clutter in sheds and garages.", "Wear gloves when moving long-undisturbed stored material." ], "confused_with": [ "black-widow" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Not medically significant; identification against black widow usually ends the question.", "health_flag": null, "url": "https://againstpest.shop/identify/spiders/false-widow/", "same_as": [] }, { "id": "mud-dauber", "common_name_en": "Mud dauber", "common_name_es": "Avispa alfarera", "scientific_name": "Sceliphron caementarium and related genera", "aliases_en": [ "dirt dauber", "organ pipe wasp" ], "aliases_es": [ "avispa de lodo" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 12, 25 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "The waist is extremely long and thread-like, far more elongated than any other common wasp — this alone identifies the group.", "Body is slender, 12 to 25 mm, usually glossy black, sometimes with yellow markings or a metallic blue sheen.", "The nest is a hardened mud structure — either a smooth lump or a set of parallel tubes resembling organ pipes — plastered to a sheltered vertical surface." ], "evidence_left": [ "Mud tubes or lumps on walls, ceilings, under eaves, in garages and sheds, and in disused equipment.", "Solitary wasps flying slowly and repeatedly to the same spot carrying mud." ], "distribution": "Throughout the United States.", "biology": "Solitary and non-defensive; they do not guard the nest and sting only if handled directly. They provision nests with spiders, including widows, so they are genuinely beneficial. Old nests are frequently reused by other insects.\n", "prevention": [ "Scrape old mud nests off surfaces once activity has ended, then clean the area.", "Screen open sheds and outbuildings if nesting is unwanted." ], "confused_with": [ "paper-wasp" ], "treatment_verdict": "prevention-first", "treatment_verdict_reason": "Non-aggressive, beneficial, and nests are removed mechanically once inactive.", "health_flag": null, "url": "https://againstpest.shop/identify/stinging-insects/mud-dauber/", "same_as": [] }, { "id": "bumble-bee", "common_name_en": "Bumble bee", "common_name_es": "Abejorro", "scientific_name": "Bombus spp.", "aliases_en": [ "bumblebee" ], "aliases_es": [ "abejorro común" ], "category": "stinging-insects", "category_name": "Stinging insects", "size_mm": [ 15, 25 ], "identification_confidence": "field", "confidence_note": null, "diagnostic_features": [ "The entire abdomen is densely furry, including the top — this is the decisive separator from a carpenter bee, whose upper abdomen is shiny, black, and bare.", "Large and robust at 15 to 25 mm, with broad black and yellow (sometimes orange or white) bands of dense hair.", "Flight is slow, heavy, and audibly low-pitched, quite unlike the faster, higher-pitched flight of a honey bee or a wasp." ], "evidence_left": [ "Small colonies in ground cavities, under decking, in compost, in old rodent burrows, or in insulation.", "A modest number of bees entering a single ground-level opening, unlike the heavy traffic of a honey bee colony." ], "distribution": "Throughout the United States; several species are in documented decline.", "biology": "Important native pollinators with small annual colonies of a few dozen to a few hundred individuals that die off in autumn, leaving only new queens. They are not aggressive away from the nest. Several North American species have declined sharply and at least one is federally listed as endangered, which makes needless destruction both unhelpful and potentially a legal matter.\n", "prevention": [ "Where the nest is away from traffic, leaving it alone through the season is usually the right answer — the colony dies off in autumn.", "Seal ground-level cavities and decking gaps in early spring, before queens select a site." ], "confused_with": [ "carpenter-bee", "honey-bee" ], "treatment_verdict": "monitor-and-assess", "treatment_verdict_reason": "Beneficial native pollinators with short-lived annual colonies. Location and season usually settle the question without any intervention.\n", "health_flag": null, "url": "https://againstpest.shop/identify/stinging-insects/bumble-bee/", "same_as": [] }, { "id": "brown-dog-tick", "common_name_en": "Brown dog tick", "common_name_es": "Garrapata marrón del perro", "scientific_name": "Rhipicephalus sanguineus", "aliases_en": [ "kennel tick" ], "aliases_es": [ "garrapata del perro" ], "category": "ticks", "category_name": "Ticks", "size_mm": [ 3, 5 ], "identification_confidence": "field", "confidence_note": "The defining clue is behavioural — this is the one tick that completes its whole life cycle indoors.", "diagnostic_features": [ "Uniform reddish-brown with no white ornamentation on the shield, separating it from the American dog tick.", "Elongated, narrow body outline rather than the rounded shape of Dermacentor species, 3 to 5 mm unfed.", "The base of the mouthparts is hexagonal when viewed from above, which is characteristic of the genus." ], "evidence_left": [ "Ticks found indoors at all life stages — crawling up walls, around door frames, and in cracks — which no other US tick does.", "Heavy infestation of a dog and of its resting areas, kennels, and bedding." ], "distribution": "Throughout the United States, strongly associated with dogs and indoor environments.", "biology": "Uniquely among common US ticks, this species completes its entire life cycle indoors, so an infestation can build inside a home or kennel without any outdoor exposure. That single fact changes the whole approach, and it is why finding ticks climbing indoor walls points to this species. It can transmit Rocky Mountain spotted fever and canine ehrlichiosis.\n", "prevention": [ "Work with a veterinarian on the dog itself, which is the reservoir; treating the building alone will not resolve it.", "Launder and heat-dry pet bedding, and vacuum cracks, baseboards, and resting areas thoroughly.", "Seal cracks and crevices in kennels and around baseboards where the stages hide." ], "confused_with": [ "american-dog-tick" ], "treatment_verdict": "professional-recommended", "treatment_verdict_reason": "An indoor-breeding tick population needs coordinated veterinary and structural action; addressing only one side reliably fails.\n", "health_flag": "disease-vector", "url": "https://againstpest.shop/identify/ticks/brown-dog-tick/", "same_as": [] } ] }