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Title: The effect of chrysanthemum leaf trichome density and prey spatial distribution on predation of Tetranychus urticae (Acari: Tetranychidae) by Phytoseiulus persimilis (Acari: Phytoseiidae)
Authors: Stavrinides, Menelaos 
Skirvin, D. J. 
Keywords: Phytoseiidae;Predatory mites;Californicus McGregor
Category: AGRICULTURAL SCIENCES;Agricultural Biotechnology;Other Agricultural Sciences
Field: Agricultural Sciences
Issue Date: 1-Jan-2003
Source: Bulletin of Entomological Research, Volume 93, Issue 4, July 2003, Pages 343-350
Journal: Bulletin of Entomological Research 
Abstract: The effect of plant architecture, in terms of leaf hairiness, and prey spatial arrangement, on predation rate of eggs of the spider mite, Tetranychus urticae Koch, by the predatory mite Phytoseiulus persimilis Athias-Henriot was examined on cut stems of chrysanthemums. Three levels of leaf hairiness (trichome density) were obtained using two different chrysanthemum cultivars and two ages within one of the cultivars. The number of prey consumed by P. persimilis was inversely related to trichome density. At low prey densities (less than ten eggs per stem), prey consumption did not differ in a biologically meaningful way between treatments.The effect of prey spatial arrangement on the predation rate of P. persimilis was also examined. Predation rates were higher in prey patches on leaves adjacent to the release point of P. persimilis, but significantly greater numbers of prey were consumed in higher density prey patches compared to low density patches. The predators exhibited non-random searching behaviour, spending more time on leaves closest to the release point. The implications of these findings for biological control and predator-prey dynamics are discussed.
ISSN: 00074853
DOI: 10.1079/BER2003243
Type: Article
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