Decline of Phorate and Dimethoate Residues in Treated Soils Based on Toxicity to Drosophila melanogaster


Source: Journal of Economic Entomology, Volume 58, Number 1, February 1965 , pp. 106-111(6)

Publisher: Entomological Society of America

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Dimethoate and phorate were studied as soil treatments in the field and laboratory, using toxicity to Drosophila melanogaster (Meigen) to determine the rate of breakdown. Initial recoveries of surface treatments with both insecticides in the field were significantly greater than the amount applied. The high dimethoate recoveries were confirmed in laboratory surface treatments of moistened soil. Surface treatment of air dry soils and soil insecticide mixtures produced recoveries lower than applied. The high recoveries of phorate field surface treatments were not confirmed by laboratory surface treatments, but are obtained throughout the laboratory study when phorate-soil mixes were held in a 3-in. layer. These phorate soil mixes gradually increased in toxicity for 28 days, when they were equivalent to 4 times the phorate applied.

Following the high initial recoveries, the surface treatments of both insecticides declined in a conventional manner. Phorate breakdown was greatest during the first week and almost complete at the end of 1 month. Dimethoate declined more slowly, with about 30% remaining at the end of 1 month.

Document Type: Research Article

Publication date: February 1, 1965

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.
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