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deer at 4-poster device

In a field of tall dry grass, a deer eats from a bin at the bottom of a tall plastic container. Atop the edge of the bin are two posts, about 1 foot tall each, cased in yellow foam, which the deer's head, neck, and antlers are rubbing against as it eats.

White-tailed deer (Odocoileus virginianus) are a key host for blacklegged ticks (Ixodes scapularis), vectors of Lyme disease, anaplasmosis, and babesiosis in the eastern U.S. A common tool in integrated tick management programs is the “4-poster” device, which applies acaracide to deer as they feed on corn bait. (Photo by Wayne Ryan, USDA Agricultural Research Service, public domain)

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