Photos from the WFIWC Archives:
Equipment and Methodology

In 1945, a new insecticide, DDT, was tested as an alternative to lead arsenate against the hemlock looper in Clatsop County, Oregon. Here, W.J. Buckhorn (left) and R.L. Furniss of the Portland FIL count dead loopers that dropped from treated trees. Buckhorn had climbed to the top of 250 ft trees, topped them, and marked them with white flags to mark plot corners for spray-plane pilots. Writer Stewart Holbrook described the aftermath: "Thirty minutes after spraying, dead loopers began raining down from the canopy, eventually totaling 4 million to the acre as measured on 2x3 ft. muslin trays beneath the area." Photo 22 by Stan Speigle, WFIWC archives. (Furniss 2000, Fig. 8).

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