Photos from the WFIWC Archives:
Yellowstone National Park

Spraying lead arsenate on lodgepole pines infested with larvae of needletiers (Argyrotaenia tubulana Freeman) and sawflies (Neodiprion burkei Middleton) along the park highway near West Yellowstone, MT, July 1924. Harry E. Burke studied these insects and supervised spraying during 1925-1927.(Furniss & Renkin 2003, Figure 8). Coeur d'Alene FIL photo no. 263 from WFIWC archives.

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