Theses experiments were conducted to evaluate the selectivity of tebufenpyrd to Amblyseius womersleyi, which is the most effective biological control agent in the integrated management of tea red spider mite, Tetranychus kanzawai. Adult female predatots survived on a diet of tea red spider mite immatures intoxicated with tebufenpyrad, and their fecundity was not substantially affected. And the sex-ratio of the progeny was female-biased for both diets, 2.29 females to 1 male for adult females reared on untreated prey and 2.23:1(♀:♂) for adult females reared on treated prey, suggesting that intoxicated prey had no serious effect on the sex-ratio of the progeny. Survival and prey consumption of adult female predators that were exposed to leaf discs dipped at tebufenpyrad concentration of100 ppm while they were fed tea spider mite eggs for 120h were not sigificantly affected, but their mobility and reproduction were affected. The results indicate that rates lower than 25ppm are likely to be required for the integrated management of T. kanzawai.
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