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Selective Toxicity of Three Acaricides to the Predatory Mite, Neoseiulus womersleyi and its Prey, Tetranychus urticae (Acari: Phytoseiidae, Tetranychidae)  

Cheon, Geum-Su (Department of Plant Medicine, Sunchon National University)
Paik, Chae-Hoon (Honam Agricultural Research Institute, NICS, RDA)
Kim, Sang-Soo (Department of Plant Medicine, Sunchon National University)
Publication Information
The Korean Journal of Pesticide Science / v.12, no.3, 2008 , pp. 249-255 More about this Journal
Abstract
The comparative toxicity of recommended rates of three acaricides, fluacrypyrim, cyflumetofen and spiromesifen to the predatory mite, Neoseiulus womersleyi and its prey, Tetranychus urticae was bioassayed in the laboratory. Fluacrypyrim and cyflumetofen were much less toxic to adult females of N. womersleyi than to those of T. urticae. Adult female predators treated with these two acaricides produced $88{\sim}93%$ as many eggs as did control females. Fluacrypyrim and cyflumetofen did not affect the hatch of N. womersleyi eggs or the development of surviving immature predators, and $92{\sim}96%$ of immature predators reached adulthood. Spiromesifen at its treated concentration did not significantly affect the survival and reproduction of adult female predators but caused 100% mortality in larvae of N. womersleyi. Adult female predators survived on a diet of spider mites treated with fluacrypyrim and cyflumetofen, and their fecundity was not significantly affected. Moreover, immature predators developed normally on prey treated with these two acaricides. The results indicate that fluacrypyrim and cyflumetofen are promising candidates for use in integrated mite management programs where N womersleyi is the major natural enemy.
Keywords
Neoseiulus womersleyi; Tetranychus urticae; acaricides; relative toxicity; integrated management;
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