Photos from the WFIWC Archives:
Yellowstone National Park

During 1929-1934, an infestation of western spruce budworm in Cody Canyon, Wyoming, was sprayed heavily with a solution of lead arsenate in an attempt to protect the scenic east entrance to Yellowstone Park. This crew is dousing an infested Douglas-fir. In response to the insistence of local inhabitants, thousands of gallons of spray were applied to trees around seven ranches and along the road leading to the Park (Furniss & Renkin 2003, Figure 5B). Coeur d'Alene FIL photo from WFIWC archives.

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