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Guthion® (O,O-dimethyl S-(4-oxo-1 ,2,3-benzotriazin-3-(4H)- ylmethyl) phosphorodithioate), used experimentally reduced the number of Douglas-fir cone midges (Contarinia oregonensis Foote) and cone moths (Dioryctria abietivorella Grote and Henricus fuscodorsana Kearfott) in the cones of Douglas fir. The effectiveness of this chemical increased with the amount of active ingredient applied per cone. At the highest rate of application, one well-timed spraying reduced the number of cone midges per cut face from 166 to 3 and the number of cone moths per one-half cone from 4 to none. Conelet abortion was reduced significantly over untreated controls. No adverse effect of the insecticide was recorded on Torymu8 sp., the principal parasite of the Douglas- fir cone midge.
Document Type: Research Article
Publication date: October 1, 1962
More about this publication?
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.