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Rate of Population Increase of the Two spotted Spider Mite (Acari: Tetranychidae) on Peanut Leaves Treated with Pesticides

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Abstract:

Several commonly used pesticides were evaluated for their effect on the intrinsic rate of natural increase (rm) of Tetranychus urticae Koch on peanut to determine whether or not stimulation of mite reproductive potential by pesticides was a factor contributing to mite population increases in peanut fields. Mites fed on peanut leaves treated with mancozeb, carbaryl, and mancozeb + carbaryl had slightly, but consistently, higher rm values than mites fed on leaves from the nontreated check. Mites exposed to peanut leaves treated with ammonical copper, fentin hydroxide, benomyl, and benomyl + mancozeb + carbaryl had slightly, but consistently, lower rm values than mites exposed to the nontreated check. The data suggest that some pesticides can contribute to increased mite populations in peanut fields by stimulation of the mite's reproductive potential, whereas other pesticides suppress mites by reduction of mite reproductive potential. Two spotted spider mites on peanut leaves exhibited a greater reproductive potential than reports in the literature for other plants. Therefore, when pesticides reduce the factors limiting populations on peanut, this reproductive potential may result in mite population increases.

Document Type: Research Article

Publication date: December 1, 1982

More about this publication?
  • 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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