Twospotted Spider Mite (Acari: Tetranychidae) and Phytoseiulus persimilis (Acari: Phytoseiidae) on Greenhouse Roses: Spatial Distribution and Predator Efficacy


Source: Journal of Economic Entomology, Volume 88, Number 2, April 1995 , pp. 352-357(6)

Publisher: Entomological Society of America

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Interaction between twospotted spider mite, Tetranychus urticae Koch, and the predatory mite, Phtytoseiulus persimilis Athias-Henriot, on roses was studied in a greenhouse at Cornell University. In the absence of predators, the spider mite population showed typical S-shaped growth and averaged ≍4-fold increases in decline in 3 wk. In the presence of predators, spider mites showed an initially slow (<50%) increase followed by a decline concurrent with a rapid increase of predators. Spider mites were nearly eliminated within .'5 wk of the introduction of the predators. Most spider mites were found on the lower canopy when their overall density was low but more mites were found on the lower canopy when their density increased, especially in the absence of predators. Both spider mites and predators were strongly aggregated. The dispersion of spider mites was similar in the upper and lower canopy and was not affected by the presence of predators. Regressions of predator density on prey density revealed 44% positive density-dependent aggregation. The strength of aggregation increased with predator density and was positively associated with the suppression of prey population. The spicier mite population growth rate \Vas negatively related to both predator and spider mite density; the effect of predator density on the growth rate was 35 times greater than that of spider mite density. Potential for control of T urticae on roses through pest population monitoring and the integration of chemical and biological control is discussed.

Document Type: Research Article

Publication date: April 1, 1995

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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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