应用浸叶法评价14 种杀虫剂对棉花粉蚧的毒力

棉花粉蚧（Phenacoccus solenopsis Tinsely）是一种近年来在世界范围内发生危害的入侵性害虫，已给巴基斯坦、印度等多国的棉花生产造成严重损失。2008 年中国大陆发现其发生，目前已在局部地区入侵棉田、造成危害，对中国棉花产业潜在威胁巨大。为了寻找合适的防治药剂，采用浸叶法测定了14 种杀虫剂对棉花粉蚧三龄若虫的毒力。结果表明，高效氯氟氰菊酯、丙溴磷、毒死蜱和阿维菌素相对毒力较高；随着处理时间延长，阿维菌素、甲维盐、多杀霉素和溴虫腈4 种杀虫剂对棉花粉蚧三龄若虫毒力上升明显。药后24 h，14 种药剂的相对毒力由高到低依次为高效氯氟氰菊酯、丙溴磷、毒死蜱、阿维菌素、辛硫磷、丁硫克百威、多杀霉素、溴虫腈、高效氯氰菊酯、灭多威、甲维盐、三唑磷、矿物油、鱼藤酮；药后48 h，14 种药剂的相对毒力由高到低依次为高效氯氟氰菊酯、丙溴磷、阿维菌素、毒死蜱、甲维盐、溴虫腈、多杀霉素、丁硫克百威、辛硫磷、高效氯氰菊酯、灭多威、三唑磷、矿物油、鱼藤酮，与药后24 h的相对毒力顺序略有变化。

Toxicity of 14 insecticides to cotton mealybug Phenacoccussolenopsis Tinsely with leaf dipping method

The cotton mealybug Phenacoccus solenopsis Tinsely has become an important alien invasive pest, and hascaused serious damage to the cotton industry in Pakistan and Indian in recent years. It was found to infest in 2008 inmainland China, and infected some cotton plantations in several places, and would be a great potential threat to cottonindustry of China. For presenting effective insecticides to control the cotton mealybug, toxicity of 14 insecticides to 3rdnymph of the cotton mealybug with leaf dipping method was determined in this paper. The results showed that the toxicityof lambda-cyhalothrin, profenophos, chlopyrifos, and avermectins was relatively high in 14 insecticides tested. With longertreatment time, the toxicity of avermectins, emamectin benzoate, spinosad and chlorfenapyr increased significantly. After24 hours treatment, relative toxicity of the 14 insecticides from high to low was lambda -cyhalothrin, profenofos,chlorpyrifos, avermectins, phoxim, carbosulfan, spinosad, chlorfenapyr, beta cypermethrin, methomyl, emamectin benzoate,triazophos, petroleum oil, and rotenone respectively. After 48 hours treatment , those relative toxicity from high to low waslambda -cyhalothrin, profenofos, avermectins, chlorpyrifos, emamectin benzoate, chlorfenapyr, spinosad, carbosulfan,phoxim, beta cypermethrin, methomyl, triazophos, petroleum oil, and rotenone. Compared to 24 hours, the relative toxicitysequence of 48 hours varied a little.