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Laboratory Studies on Effects of Three Permethrin Formulations on Mortality, Fecundity, Feeding, and Repellency of the Twospotted Spider Mite (Acari: Tetranychidae)

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A monosize droplet generator was used to apply discrete amounts of three permethrin formulations (Ambush, TF2465, and D325) to bean leaf disks. After treatment, five adult female Tetranychus ulrticae Koch were placed on the disks. Fecundity, mortality, feeding rate, and repellency were detennined 24 and 48 h later. For each formulation, six droplet densities were used with five replicate leaf disks per droplet density. Results indicated that the effects of permethrin on T. urticae varied with both formulation and droplet density. With Ambush and TF2465, significant reductions in feeding and oviposition were recorded concomitantly with a significant increase in repellency. All of these effects were significantly correlated with droplet density. With D325, no significant treatment effects were observed. If the typical irritant effect of pyrethroids is partially responsible for the resurgence of mite populations within apple orchards, use of formulations that do not elicit this effect (i.e., D325) may allow these pesticides to be applied safely for control of other target species.

Document Type: Research Article

Publication date: April 1, 1993

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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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