添加表面活性助剂对2种药剂防治小菜蛾的增效作用

为了探索添加表面活性助剂对药剂防治小菜蛾效果的影响,采用叶片残留药膜法研究了两种药剂中分别添加两种表面活性助剂后对小菜蛾的毒力,并进行了田间防治试验。室内毒力测定表明,有机硅表面活性助剂0.03%Silwet 408对2%甲氨基阿维菌素苯甲酸盐微乳剂(ME)有明显的增效作用,使之对小菜蛾幼虫毒力提高了2.37倍,而矿物源增效剂0.3%GY-Spry对2%甲维盐ME没有明显增效作用;两种表面活性助剂对20%阿维·杀虫单ME均没有明显的增效作用。田间药效试验结果表明,添加两种表面活性助剂均能显著提高两种药剂对小菜蛾的防治效果,7d后防治效果分别达到91%和96%以上,均显著优于药剂单独使用时的效果。

The synergism of insecticides with surfactants for control of Plutella xylostella

In order to explore the effects of added surfactants on the control effects of two insecticides against Plutella xylostella, toxicity of two insecticides with or without two different surfactants was evaluated by the leaf-dip method in the lab and field trail. The indoor toxicity test showed that the adding of Silwet 408 to emamectin benzoate 2% ME significantly increased the toxicity by 2.37-fold, but GY-Spry did not show any synergistic effect. The two surfactants did not show any synergistic effects to abamectin·monosultap 20% ME. Field trials demonstrated that the two insecticides mixed with the two surfactants could increase the control effect against P. xylostella, with the efficacy of more than 91% and 96%, respectively, 7 days post application, which were better than that when the insecticides were used alone.