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- After finding a suitable host, nymphs reach engorgement in 3-11 days, drop off, and molt into adults in 14-15 days (range 12-120 days). Adults can survive more than a year (about 600 days) unfed but after finding a suitable host, adults mate on the host after partial feeding. Engorgement of the female requires 4-17 days and she then drops off.
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Adult female Rocky Mountain wood ticks will insert their mouthparts into the host and feed until fully engorged, while male Rocky Mountain wood ticks feed for a shorter period of time. Adult Rocky Mountain wood ticks can survive for more than a year unfed.
The Rocky Mountain wood tick is the primary vector for Colorado Tick Fever Virus. This tick transmits the agents of Rocky Mountain spotted fever and Tularemia in Colorado. It also is the principal cause of tick paralysis in the state and is an experimental vector of Anaplasma ovis Lestoquard
Owners may observe engorged ticks on their livestock or pets. Dermacentor andersoni spp. ticks are quite large and easily recognized by white markings on the scutum, and by their posterior festoons (scalloped edges).
Female wood ticks feed for 4-17 days before dropping off their host and laying up to 6,000 eggs. The primary determinant of lifespan for Rocky Mountain Wood ticks is the availability of the blood meal required to reach each life stage.
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Morphology. Disease transmission. See also. References. Dermacentor andersoni, commonly known as the Rocky Mountain wood tick, is a hard tick, or member of the Ixodidae family, with three life stages including larvae, nymph, and finally adult, or, more entomologically, imago.
Further west in the northern intermountain region, large numbers of adult wood ticks can occur in April and May. Adult wood ticks can survive for up to 600 days without feeding. Adult ticks prefer medium to large-sized mammals and can be found questing about knee-high on the tips of vegetation.
Adults of the Rocky Mountain tick feed on larger mammals such deer, including humans. During each stage the tick may feed for days, sometimes weeks, before it becomes completely engorged blood. The American dog tick (Dermacentor variabilis), which is a common tick in the eastern plains areas of the state, has a similar life history.
