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Increase in toxicity to Drosophila melanogaster of phorate-treated soils



Increase in toxicity to Drosophila melanogaster of phorate-treated soils



J Econ Entomol 58(3): 491-497



Phorate-treated soils previously shown more toxic to Drosophila than phorate were found highly toxic to phosphate resistant house flies. Musca domestica L.; less toxic to larvae of the Mexican bean beetle, Epilachna varivestis Mulsant; nontoxic to phorate -susceptible larvae of the Colorado potato beetle, Leptinotarsa decem-lineata (Say); and nontoxic to the southern armyworm, Prodenia eri-dania (Cramer). The toxicant present was stable, showed good residual toxicity to houseflies and high cholinesterase inhibition. Gas chroma-tography with an electron capture detector and column chromatography indicated the presence of phorate, several of its oxidative metabolites, and a large quantity of unidentified components. None of the oxidative metabolites individually were sufficiently toxic to account for the toxicity. Several combinations of phorate or the oxidative metabolites or both were synergistic with sufficient increase in toxicity possibly to account for the high toxicity of the treated soils to Drosophila. Toxicity of the sulfone of phorate or the unidentified components was not studied.

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Accession: 014517615

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DOI: 10.1093/jee/58.3.491


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