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Toxicity of Pesticide Residues to a Beneficial Arthropod, Phytoseiulus persimilis (Acari: Phytoseiidae)

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Phytoseiulus persimilis (Athias-Henriot) is a predatory mite used to control the twospotted spider mite, Tetranychus urticae (Koch). Since the beginning of the 1970s, the predatory mite has been mass-released in greenhouses where pesticides have been previously sprayed to control various pests (Fungi, Acarina, or Insecta). Residues of these treabnents are sometimes toxic to P. persimilis, precluding its expected beneficial action. We present a method to estimate the effects of residue from one pesticide in a situation where several pesticides are used concomitantly. We estimated the residual toxicity of 27 commonly used pesticides and expressed them as thresholds for P. persimilis. These thresholds correspond with the number of days after treatment when the pesticide remains toxic for P. persimilis and therefore correspond with the optimal time before release of the predaceous mite after a pesticide treatment.

Document Type: Research Article

Publication date: December 1, 1992

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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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