Tick Control in Relation to the Rocky Mountain Spotted Fever: A Report of Cooperative Investigations Conducted by the Bureau of Entomology and the Montana Experiment Station
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abundance adult ticks adults feed appear April bedbugs Birdseye Bitter Root Valley Board of Health Bureau of Entomology canyons cerned chipmunk clear columbian ground squirrel cycle Dallas deﬁnite Dermacentor venustus eggs examined fact ﬁeld station ﬁnd ﬁnding ﬁrst ﬂesh free of ticks germ ground squirrel guinea pig Health and Mar.-Hosp horses and cows immature stages indicated infected ticks investigation laboratory large number larger animals less extent manís infection Marine Hospital Service McCalla and Brenton MONTANA AGRICULTURAL MONTANA EXPERIMENT STATION Montana State Board Mountain goats Mountain Spotted Fever number of adult nymphs and adults observations periments pine squirrel present R. A. COOLEY rock squirrel Rocky Mountain Spotted rodents scrotum seasonal history secured seems small mammals species of tick speciﬁc spotted fever tick susceptible temperature not taken tick bites tick control tick to attach ticks occur transmission transmit the disease west side wild animals Wilson and Chowning winter woodchuck