Photos from the WFIWC Archives:
Control Methods

Ford Trimotor, sometimes called the "Tin Goose," owned by Johnson Flying Service, Missoula, MT. Two hundred of this aircraft were manufactured by Henry Ford from 1925-1933. It was covered with corrugated aluminum and the tail controls were external. This particular plane was still in use in Idaho to spray DDT to control the tussock moth (1947) and the spruce budworm (1955). I (M. Furniss) was the Project Entomologist on the 1955 project, which treated 1 million acres on the Boise N.F. and surrounding areas (with an assortment of kinds of aircraft). It is still the largest such spray project in Idaho; silviculture and forest management have replaced pesticides for managing this defoliator. (Furniss 2004, un-numbered Figure).

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