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Helicopter Application of Guthion for the Control of the Douglas- Fir Cone Midge1

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This paper reports the degree of effectiveness of helicopter application of Guthion® (O,O-dimethyl S-(4-oxo-l,2,3-benzotriazin- 3-(4H)-ylmethyl) phosphorodithioate) to open-grown Douglas-fir for control of the Douglas-fir cone midge Contarinia oregonensis Foote). Control varied with rate of application and position of cones in the tree; it was greatest in the tops of trees that had received the most insecticide and decreased downward in the tree and with lighter deposits. Spray deposits measured on small sample cards ranged from 0 to 2.08 lb. of insecticide per acre. The spray pattern on the forest floor was investigated. Details of the chemical analysis and a method of rapid assay are given.

Document Type: Research Article

Publication date: October 1, 1963

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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