1Sanya Science & Technology Academy for Crop Winter Multiplication，Sanya 572000，Hainan，China|2Chinese Academy of Agricultural Sciences，Institute of Vegetables and Flowers，Beijing 100081，China
Abstract：The laboratory toxicity determination and control effects of 4 insecticides on diamondback moth were studied．The result showed that 48 h after spraying the toxicity of 5% chlorantraniliprole SC was the highest．The LC50 values was 0.563 0 mg·L-1．The toxicity of 10% spinosad WG was the second．The LC50 values were 0.856 7 mg·L-1．The toxicities of 1.9% emamectin benzoate EC and 1% avermecti EC were lower．The result of field drug effect experiment indicated that the efficacy of 5% chlorantraniliprole 1 000 times liquid SC was the best，reaching 95.04%，which was significantly higher than the other 3 insecticides．The control effect of 10% spinosad WG 5 000 times liquid was the second with the control efficacy of 82.01%．The 1.9% emamectin benzoate EC 1 500 times liquid and 1% avermecti EC 750 times liquid had the lower control effects，with the control efficacy of 71.67% and 63.95%，respectively.
