Effectiveness and pesticide susceptibility of the pyrethroid-resistant predatory mite Amblyseius womersleyi in the integrated pest management of tea pests |
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Authors: | M Mochizuki |
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Institution: | (1) Department of Tea Agronomy, National Research Institute of Vegetables, Ornamental Plants and Tea, Kanaya, Shizuoka, 428-8501, Japan;(2) Present address: Entomology Group, National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki, 305-8604, Japan |
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Abstract: | To prevent the resurgence of the Kanzawa spider mite, Tetranychus kanzawai Kishida, on tea plants caused by the application of synthetic pyrethroid insecticides (SP), an SP-resistant strain of the predatory mite Amblyseius womersleyi Schicha was released onto tea bushes under SP (permethrin) application. The released predators successfully survived and may be able to suppress T. kanzawai. In the plot where A. womersleyi was released, the damage to new leaves was less severe than in the control plot and the predators remained resistant to the permethrin in the bushes. The selective use of pesticides that are harmless against natural enemies is necessary to achieve a program of integrated tea pest management. Although mortality of adult females of the tested strain in response to SP was from 6.5 to 89.3%, and mortality was more than 95% in response to several carbamate and organophosphate insecticides, usefulness of A. womersleyi as an agent of biological control was successfully demonstrated in the present study. |
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Keywords: | Acari Amblyseius womersleyi biological control Phytoseiidae synthetic pyrethroid tea Tetranychidae Tetranychus kanzawai |
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