Lone Star Tick Identification & Control

Quick Identification

• Size: Adults about ⅛ inch; larvae barely visible (period-sized)
• Color: Brown; adult female has a single distinctive white spot in the center of her back
• Key Features: Long, narrow mouthparts; round body shape (vs. oval for dog ticks); very aggressive biter; female’s white spot is the primary identification feature
• Active Season: April through July
• Risk Level: Moderate — transmits ehrlichiosis, tularemia; associated with alpha-gal syndrome (red meat allergy)

An Expanding Threat

The lone star tick has historically been most common in southern Illinois, but its range has been expanding northward in recent years. It’s named for the single white spot on the adult female’s back — a feature that makes females easy to identify but also leads to frequent confusion with the similarly sized deer tick.

Lone star ticks are aggressive biters — they actively pursue hosts rather than passively questing like deer ticks, and they’re less selective about their hosts, readily biting humans, dogs, and wildlife. They transmit ehrlichiosis and tularemia, and are increasingly associated with alpha-gal syndrome, a condition that triggers a potentially life-threatening allergic reaction to red meat and other mammalian products. Alpha-gal syndrome has been receiving significant medical and media attention as lone star tick populations expand.

The Illinois Department of Public Health notes that the lone star tick is not believed to transmit the Lyme disease bacteria, though it may be associated with a related but milder condition. If you’re finding ticks with a single white dot on their back, contact Sanctuary Pest Control at 815-993-3472 for professional tick assessment and barrier treatment.