7种农药对瓜蚜的室内毒力测定

目的]采用浸叶法测定7种药剂对瓜蚜的毒力.结果]结果表明:阿维菌素活性最高,LC50值为8.2728 mg/L,其次为甲氨基阿维菌素苯甲酸盐,LC50值为23.2278 mg/L,啶虫脒的LC50值为29.2927 mg/L,吡虫啉和毒死蜱的敏感性最低,LC50值分别为46.0487、48.9797 mg/L.螺虫乙酯各测试质量浓度处理后48、72 h时的平均死亡率仅为8.9％、11.2％,高效氯氰菊酯测试质量浓度达2000mg/L时,24 h校正死亡率仅为37.97％.结论]7种药剂对瓜蚜的毒力排序为阿维菌素＞甲氨基阿维菌素苯甲酸盐＞啶虫脒＞吡虫啉＞毒死蜱＞高效氯氰菊酯＞螺虫乙酯.

Toxicities of Seven Types of Pesticide to the Melon Aphid Aphis gossypii

Aims] The toxicities of seven insecticides to melon aphid Aphis gossypii were studied by leaf-dipping method.Results] The results showed that abamectin had the highest toxicity with LC50 of 8.2728 mg/L,next was the emamectin benzoate with LC50 of 23.2278 mg/L.The LC50 of acetamiprid,imidacloprid and chlorpyrifos were 29.2927,46.0487 and 48.9797 mg/L respectively.The average mortality was 8.9 and 11.2% under the treatment of spirotetramat after 48 and 72 h.The corrected average mortality was 37.97% under the treatment of beta-cypermethrin with concentration of 2000 mg/L after 24 h.Conclusions] The toxicity of the seven pesticides to the Aphis gossypii from high to low is abamectin>emamectin benzoate>acetamiprid>imidacloprid>chlorpyrifos>beta-cypermethrin>spirotetramat.