1974 Douglas-Fir Tussock Moth Control Project
Abstract:In June and July of 1974, 427,000 acres of Douglas-fir and grand fir timberlands in Oregon, Washington, and Idaho were treated with DDT to control the Douglas-fir tussock moth. This was the largest all-helicopter forest spray project ever carried out in the United States and required cooperation by many state and federal agencies, universities, and private landowners. Almost total insect mortality occurred immediately after treatments were applied. Defoliation ceased almost completely, and a high proportion of foliage was saved.
Document Type: Journal Article
Affiliations: Forester, Insect and Disease Management, USDA Forest Service, Region 6, Portland, Oregon
Publication date: February 1, 1976
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