15种杀虫剂对草地贪夜蛾卵的毒力测定

采用浸卵法测定了15种杀虫剂对草地贪夜蛾卵的毒力,并比较了不同杀虫剂的毒力水平。结果表明:100 mg/L处理后48 h,甲氨基阿维菌素苯甲酸盐(甲维盐)和灭多威对草地贪夜蛾卵孵化抑制率最高,达到100%,其LC 50分别为12.67 mg/L和16.95 mg/L;而200 mg/L的氯虫苯甲酰胺、多杀霉素、阿维菌素、高效氯氰菊酯、虱螨脲、辛硫磷和杀螟丹分别处理后72 h对草地贪夜蛾卵的孵化抑制率次之,在69.6%~87.65%之间,其LC 50分别为44.1、50.9、78.37、79.0、98.15、126.8 mg/L和137.7 mg/L。依据毒力测定的结果和高效低毒类杀虫剂优先选用的原则,推荐选择甲维盐、氯虫苯甲酰胺、多杀霉素、阿维菌素和高效氯氰菊酯作为防治草地贪夜蛾卵的主要药剂。

Toxicity of 15 insecticides against eggs of fall armyworm (Spodoptera frugiperda)

Using egg dipping method, the toxicities of 15 insecticides to eggs of Spodoptera frugiperda were tested under laboratory conditions. The results showed that 48 h post treatment with 100 mg/L of emamectin benzoate and methomyl, the hatching inhibition rates to eggs of S. frugiperda both reached 100%, and their 50% lethal concentration (LC50) values were 12.67 mg/L and 16.95 mg/L, respectively. And 72 h post treatment with 200 mg/L of chlorantraniliprole, spinosad, abamectin, beta cypermethrin, lufenuron, phoxim, and cartap, the hatching inhibition rate to eggs ranged from 69.6% to 87.65%, and their LC50 values were 44.1, 50.9, 78.37, 79, 98.15, 126.8 mg/L and 137.7 mg/L, respectively. Based on these results, to use emamectin benzoate, chlorantraniliprole, spinosad, abamectin, or beta cypermethrin as the main ingredients were recommended for the control of S. frugiperda eggs.