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[方法]小菜蛾是十字花科蔬菜上危害最为严重的害虫之一。采用浸液法研究了阿维菌素与毒死蜱联合混配对小菜蛾的毒力作用。[结果]结果表明:2种药剂单用时阿维菌素毒力高于毒死蜱,24 h时阿维菌素和毒死蜱的LC50值分别为380.6794、2,274.0142 mg/L。24 h内两药剂混用表现为相加作用。阿维菌素与毒死蜱的比例为1∶2.22时,48、72 h后的共毒系数可高达983和998,均表现为增效作用。[结论]随着时间的延长,2种药剂混配后表现为较强的增效作用。
[Method] Plutella xylostella was one of the most harmful pests on cruciferous vegetables. The toxicity of avermectin and chlorpyrifos combined with Plutella xylostella to Plutella xylostella was studied by immersion method. [Result] The results showed that the avermectin virulence of the two agents was higher than that of chlorpyrifos alone. The LC50 values of abamectin and chlorpyrifos were 380.6794,2,274.0142 mg / L at 24 h. Within 24 h, the two drugs showed additive effects. Avermectin and chlorpyrifos ratio of 1: 2.22, 48,72 h after the co-toxicity coefficient can be as high as 983 and 998, all showed a synergistic effect. [Conclusion] With the prolongation of time, the two agents showed stronger synergistic effect after mixing.