Disappearance of Spray Deposits of DDT, Methoxychlor, Perthane, Ethion, and Diazinon from Concord Grapes1

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Losses of DDT, methoxychlor, and Perthane® (a mixture of diethyl diphenyl diehloroethane (95%) and related reaction products (5%) deposits from the third application of a 3-spray schedule on Concord grapes were measured at biweekly intervals over a period of 42 days. The effects of growth and weathering in reducing the amounts of each insecticide are given separately. Deposits of the three chlorinated hydrocarbon insecticides disappear in the order, from least to most rapid; DDT, methoxychlor, and Perthane. Weathering is primarily responsible for these losses. Reductions in Perthane deposits caused by high temperature were equal to or greater than reductions by rain-fall of 3.11 inches. At harvest. the residue of methoxychlor was below the tolerance and usually the combined residues from 2 DDT sprays followed by 1 methoxychlor spray was below the 100% total tolerance for the two insecticides. Reduction in deposits caused by growth and weathering in 4 weeks are presented for diazinon. The effects of growth and weathering on ethion deposits over a period of 4 or more weeks arc considered separately. Ethion deposits were more persistent than those of diazinon. When daily temperatures reached a maximum of 90° F. or above, marked and rapid losses in deposits of ethion were found.

Document Type: Research Article

Publication date: August 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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