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[目的]寻找控制二斑叶螨的药剂,延缓对联苯肼酯抗性的产生。[方法]采用玻片浸渍法研究了联苯肼酯与毒死蜱对二斑叶螨的联合毒力。[结果]联苯肼酯的毒力明显高于毒死蜱,24、48、72 h的LC50值分别为10.927 7、5.154 3、3.389 4 mg/L,毒死蜱LC50值分别为433.295 3、206.798 5、69.094 4 mg/L。两药剂混用时,在1∶1~1∶80混配范围内具有增效作用,以1∶1比例混配增效作用最明显;随着毒死蜱用药量的提高,共毒系数呈现下降趋势。[结论]联苯肼酯与毒死蜱混用对二斑叶螨具有明显的增效作用。
[Objective] The research aimed to find the agent for controlling Tetranychus urticae and delay the production of Bifizinafine resistance. [Method] The joint toxicity of bifenazate and chlorpyrifos to Tetranychus urticae was studied by glass slide dipping method. [Result] The results showed that the toxicity of bifenazate was significantly higher than that of chlorpyrifos. The LC50 values at 24, 48 and 72 h were 10.927 7, 5.154 and 3.3389 4 mg / L, respectively. The LC50 values of chlorpyrifos were 433.295 3,206.798 and 5,69.094 4 mg / L. When the two agents are mixed, they have synergism in the range of 1: 1 to 1: 80 and synergistic effect in the ratio of 1: 1 is the most obvious. With the increase of the dosage of chlorpyrifos, the co-toxicity coefficient shows a downward trend. [Conclusion] The combination of bifenazate and chlorpyrifos had a synergistic effect on two-spotted spider mites.