Photos from the WFIWC Archives:
Equipment and Methodology

Ryan monoplane beneath a hopper and platform used for loading calcium arsenate dust to control a western hemlock looper outbreak in Pacific County, Washington, 1931. This was the first airplane dusting experiment attempted against a forest insect in western United States. (Photo 8768 by F.P. Keen, WFIWC archives). (Wickman et al. 2002, Fig. 8.)

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