Short-term Effects of Permethrin and Fenvalerate on Oviposition by Chrysoperla carnea (Neuroptera: Chrysopidae)

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Adult Chrysoperla camea (Stephens) were exposed for 72 h in glass petri dishes to a range of concentrations of either of two pyrethroids, permethrin or fenvalerate. Each pesticide caused a significant reduction in the number of eggs deposited per live female during exposure, and the effect increased with increasing concentration. Adult females deposited fewer eggs on the upper, most heavily pyrethroid-treated surfaces. Females exposed for only 1 h to a field dose of permethrin or fenvalerate deposited similar numbers of eggs as the controls. Females exposed for 24 or 72 h to a field dose of permethrin or fenvalerate deposited significantly fewer eggs during the exposure period, but resumed oviposition at normal rates after transfer to untreated cages. Adults did not exhibit knockdown or mortality and oviposited normally when placed in mesh cages next to, but not in direct contact with, permethrin- or fenvalerate-treated plants. Adults released into cages containing permethrin- or fenvalerate-treated plants did not avoid landing on the plants, and 66.7 and 16.7%,respectively, of those that contacted the treated plants exhibited knockdown during the 6-h observation period. After recovery from the knockdown effects, females resumed oviposition at normal rates.

Document Type: Research Article

Publication date: August 1, 1985

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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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