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Metabolism of Diazinon, Formetanate, Bifenthrin, DDT, Chlordimeform, and Bromopropylate in the Bulb Mite Rhizoglyphus echinopus (Fumouze and Robin) (Acari: Acaridae)

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Bulb mites, Rhizoglyphus echinopus (Fumouze and Robin), were exposed for 1 h to radiocarbon-labeled samples of diazinon, formetanate, bifenthrin, DDT, chlordime-form, or bromopropylate, and the extent of metabolism was assessed at 6, 12, 24, and 48 h after exposure. Pesticide degradation by bulb mites decreased in the order diazinon > bromopropylate > chlordimeform > bifenthrin > formetanate > DDT. Based on the nature of the metabolites formed in vivo and in vitro, we concluded that bulb mites possessed active oxidases, esterases, and transferases. Bifenthrin, chlordimeform, and bromopropylate were not toxic to bulb mites (LC 50 > 1,000 ppm), but they were very active against twos potted spider mites, Tetranychus urticae Koch. The relatively fast metabolism of these three compounds in bulb mites was in contrast with their slow degradation in twos potted spider mites in other studies; probably, differential metabolism played a major role in their selective toxicity. Although formetanate was toxic to both mite species, it was much more active against twos potted spider mites. Diazinon and DDT were not toxic to bulb mites. Differential metabolism also may play a role in the selective toxicity of these three compounds, but other factors (e.g., target site insensitivity) likely are involved.

Document Type: Research Article

Publication date: October 1, 1988

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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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