Effectiveness of spirodiclofen and fluacrypyrim+tetradifon on tea red spider mite, Tetranychus kanzawai was evaluated in laboratory. Spirodiclofen was highly effective against egg, larva and protonymph, however, efficacy for adult female was slightly reduced. Fluacrypyrim+tetradifon was highly effective against egg, larva and protonymph, but ineffective against adult female. In surviving adult females treated with spirodiclofen or fluacrypyrim+tetradifonethoxazole, we observed significant reduction in reproduction and egg hatchability. Spirodiclofen and fluacrypyrim+tetradifon were highly effective on mixed developmental stages of T. kanzawai. Based on the results, spirodiclofen and fluacrypyrim+tetradifon could be used for the control of T. kanzawai and 90-120 ppm of these two acaricides were recommended as their field rates.
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