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[目的]研究室内条件下4种大环内酯类杀虫剂对玉米螟的2龄幼虫和3龄幼虫的杀虫活性及2种生测方法的比较。[方法]分别采用茎秆浸渍法和药膜法。[结果]室内试验表明,玉米螟2龄幼虫对供试药剂较3龄幼虫敏感;采用浸渍法测得的供试药剂对玉米螟的活性较药膜法高。[结论]4种药剂对玉米螟的活性大小为甲氨基阿维菌素苯甲酸盐>多杀菌素>乙基多杀菌素>阿维菌素。
[Objective] The research aimed to study the insecticidal activity of four macrolide insecticides to the 2nd instar larvae and the 3rd instar larvae of Ostrinia natto Mill. [Method] Stem stalks and membrane method were used respectively. [Result] The indoor experiment showed that the 2nd instar larvae of Corn borer were more sensitive to the 3rd instar larvae than the 3rd instar larvae. The activity of the tested pesticide against Ostrinia furnacalis was higher than that of the third larvae by immersion method. [Conclusion] The activity of four kinds of pesticides to corn borer was methotrexate benzoate, spinosad, spinetoram, abamectin.