Effectiveness of several acaricides on tea red spider mite. Tetranychus kanzawai Kishida was evaluated in laboratory and field studies. In the laboratory study. ethoxazole (50. 100 ppm) was highly effective against egg and immature stages. but ineffective against adult females. Meantime, ethoxazole+fenpropathrin, chlorfenapyr+ flufenoxuron, milbemectin, acequinocyl, and bifenazate were highly effective against all stages of T. kanzawai. Diafenthiuron was highly effective against all stages tested with the exception of egg stage. In adult females treated with ethoxazole, we observed significant reduction in egg hatchability, but there was no obvious effect on number of eggs laid. In the tea field study, milbemectin and bifenazate were satisfactory control of mixed developmental stages, whereas, ethoxazole, ethoxazole+fenpropathrin, chlorfenapyr+flufenoxuron, acequinocyl, and diafenthiuron were also effective for the control of T. kanzawai.
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