Asian Longhorned Tick
Haemaphysalis longicornis
Moderate Risk Risk
Known to transmit: Under investigation — transmits SFTS virus in Asia, Theileriosis (in cattle)
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About
An invasive species first detected in the US in 2017. Females can reproduce without mating, allowing populations to explode rapidly. A single tick can produce thousands of offspring. Still being studied for disease transmission in the US.
Appearance
Light to medium brown, no distinctive markings
Size
Adult: 2–3mm unfed
Habitat & Range
Habitat
Pastures, tall grass, areas with livestock, suburban yards
Region
Eastern US — 19+ states as of 2024
Peak Season
June–September
Life Stages
Larva (< 1mm)
Can appear in massive numbers.
Nymph (1–1.5mm)
Round body. Hard to distinguish from other species.
Adult (2–3mm)
Small, round, light brown. No ornate markings.
Safety Tips
- 1.Can appear in extremely large numbers — hundreds on a single animal
- 2.Report sightings to your state agriculture department
- 3.Still being studied for human disease risk in the US
- 4.Major threat to livestock, especially cattle