采用点滴法和浸叶法对斜纹夜蛾(Spodoptera litura Fabricius)进行了毒力测定,并对其在田间进行了药效测定.结果表明,点滴法处理后48 h,甲维盐的LD50为8.70 μg/g,毒死蜱的LD50为10.37 μg/g,虫螨腈的LD50为13.16 μg/g,虫酰肼的LD50为64.26 μg/g.浸叶法处理后48 h,甲维盐的LC50为0.70 μg/mL,虫螨腈的LC50为1.52μg/mL,虫酰肼的LC50为6.77μg/mL,毒死蜱的LC50为36.41μg/mL.室外测定的结果表明,甲维盐与虫螨腈的防效较高,药效持续时间较长.由此可见,甲维盐和虫螨腈对斜纹夜蛾的毒力相对较高.%In order to screen out the pesticides for controlling Spodoptera litura Fabricius effectively, topical application method, leaf-dipping method and outdoor determination method were used to test the toxicity of 4 pesticides on S. Litura. The results showed that the LDK of the drop method was 8.70 M-g/g for peacekeeping salt, 10.37 μg/g for chlorpyrifos, 13.16 μg/g for chlorfenapyr, 64.26 μg/L for tebufenozide 48 h after treatment. The LC50 of the leaf-dipping method was 0.70 μg/mL for peacekeeping salt, 1.52 μg/mL for chlorfenapyr, 6.77 μg/mL for tebufenozide, 36.41 μg/mL for chlorpyrifos 48 h after treatment. The results of the outdoor measuring method showed that peacekeeping salt and chlorfenapyr had better control effect and longer lasting time. Thus, the virulence of peacekeeping salt and chlorfenapyr against S. Litura was relatively higher.
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