Missouri's Four Tick Species
American Dog Tick
Most commonly encountered in Missouri. Transmits Rocky Mountain spotted fever. Active April–August. Adults are large and easily detected.
Lone Star Tick
Highly aggressive — actively pursues hosts. Transmits ehrlichiosis, tularemia, STARI. Common throughout Missouri. Active spring through fall.
Blacklegged (Deer) Tick
Primary Lyme disease vector. Nymphs are poppy-seed sized — easily missed. Highest risk May–June (nymph stage) and October–November (adult stage).
Brown Dog Tick
Prefers dogs but will bite humans. Can complete entire life cycle indoors — infestations in kennels and homes are possible. Transmits Rocky Mountain spotted fever.
Lyme Disease Risk in Missouri
Missouri falls within the expanding range of blacklegged tick populations and reports confirmed Lyme disease cases annually, though at lower rates than the upper Midwest and Northeast where the disease is endemic. The St. Louis metro fringe counties — particularly St. Louis County, St. Charles County, and Franklin County with their combination of high deer density and wooded residential lots — report the highest blacklegged tick encounter rates in the state. The risk is real but proportionate: not every blacklegged tick carries Borrelia, and transmission requires a tick to be attached for 36–48 hours. Prompt tick checks after outdoor activity are the most effective personal protection measure.
Yard Treatment for Tick Control
Professional tick barrier treatments target the lawn-woodland interface — the transitional zone where maintained lawn meets wooded areas, landscape beds, or leaf litter accumulation. This interface is where the vast majority of tick encounters occur; ticks do not typically venture into the center of open, maintained lawns. Residual pyrethroid or bifenthrin applications to this zone, applied every 6–8 weeks from April through October, significantly reduce tick populations in the treated area. For rural Missouri properties with extensive woodland borders, perimeter treatment of the outdoor living areas — deck surrounds, play areas, garden edges — is the realistic management scope. D&D Pest Control serves Franklin County and rural Missouri for tick management programs. Visit ddpestcontrolmo.com.