Abstract
1. The tea red spider mite, Tetranychus kanzawai KISHIDA, is one of the serious pests of tea plant in Japan. Phencapton and Estox had been used since 1957 and 1964 respectively for the control of mites and showed very effective as acaricides in the tea fields. However, the controlling effect of Phencapton and Estox seemed to be decreased remarkably since 1961 and the late autumn in 1964 respectively in some tea fields.2. The author investigated the resistance responses of mite to Phencapton and Estox by the laboratory and field tests.3. The mite caught in the tea field in which Phencapton and Estox showed less effective, showed clear resistances to these chemicals. From the above results, it was considered that these resistances probably occurred between 1961 and 1962 on Phencapton and between. the spring and the autumn in 1964 on Estox in the tea field of Tea Research Station at Kanaya, Shizuoka prefecture.
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