Lone star tick
Amblyomma americanum
Prompt checks and edge habitat management are the measures that reduce exposure.
- Scientific name
- Amblyomma americanum
- Size
- 3–5 mm
- Group
- Ticks
- Identification confidence
- Identifiable with care
Identification confidence. The female's single white dot is unmistakable; males and nymphs are harder.
No licensed photograph yet
We have not yet licensed a photograph for this species. The written description above is complete and is what the identification depends on — it is not a caption for a missing picture.
How to recognise it
These are the features that identify a lone star tick. Each one is described in words so the identification works without the diagram.
- 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.
What it leaves behind
- 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.
Why an infestation persists
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.
Where it occurs
The Southeast, lower Midwest, and mid-Atlantic, with the range expanding northward.
Where to look for it
- On the body after time in wooded and shrubby areas within the species' range.
- [object Object]
- Around a deer trail or bedding area, where density is highest.
- All life stages bite people, so check for very small ticks as well as obvious ones.
When you see it, and why
Active from spring through late summer, with all life stages biting people — unlike some species where only certain stages do. This one actively host-seeks, moving toward a host rather than waiting passively, which is why encounters can feel more frequent than tick density alone would suggest.
What getting the identification wrong costs you
The female's single white dot is unmistakable and needs no magnification. The reason this identification matters to the public more than most is alpha-gal syndrome — an acquired allergy to mammalian meat that can develop after a bite from this species, with symptoms typically delayed several hours after eating, which is why it often goes unrecognised for a long time. If someone develops delayed reactions to red meat after a tick bite in this range, that history is worth telling a clinician.
What a professional actually does
As with other ticks, personal protection and prompt checks decide individual risk far more than any area treatment does. The property-level work that genuinely helps is reducing dense understorey and maintaining a clear, mown margin between used ground and woodland. If anyone in the household develops delayed reactions to red meat after a bite in this species' range, that belongs with a clinician rather than with a pest operator.
What prevents it
- Check promptly and thoroughly after time outdoors in the species' range.
- Maintain mown, clear borders between lawn and wooded or brushy areas.
Commonly confused with
American dog tick Dermacentor variabilis
The shield behind the head carries conspicuous white or silvery mottled ornamentation, unlike the blacklegged tick's solid dark shield.
Blacklegged tick Ixodes scapularis
Adult females have a solid dark reddish-orange abdomen with a distinct solid black shield behind the head, and no white markings or ornamentation.
Sources
Every claim on this page traces to one of these.
- US Environmental Protection Agency Tier 1. Pesticides.
- National Pesticide Information Center Tier 1. National Pesticide Information Center.
- Cooperative Extension System Tier 2. University extension entomology resources.