杀虫剂对小菜蛾幼虫的毒力研究

采用浸叶法测定10种杀虫剂对海南省海口、三亚、儋州小菜蛾田间种群的毒力。结果表明：10种药剂对海口地区小菜蛾3龄幼虫的毒力LC50大小顺序为：Bt＞氟啶脲＞多杀菌素＞茚虫威＞虫螨腈＞阿维菌素＞丁醚脲＞虫酰肼＞杀螟丹＞高效氯氰菊酯；三亚地区小菜蛾3龄幼虫的毒力LC50大小顺序为：Bt＞多杀菌素＞氟啶脲＞茚虫威＞虫螨腈＞阿维菌素＞虫酰肼＞丁醚脲＞杀螟丹＞高效氯氰菊酯；儋州地区小菜蛾3龄幼虫的毒力LC50大小顺序为：Bt＞多杀菌素＞茚虫威＞氟啶脲＞虫螨腈＞阿维菌素＞丁醚脲＞虫酰肼＞杀螟丹＞高效氯氰菊酯。3个地区

Toxicity of Several Insecticides to Plutella xylostella L.

The toxicities of 10 insecticides to the 3 instar larvae of Plutella xylostella collected from Haikou, Sanya and Danzhou of Hainan Province were tested by leaf-dipping method. The result indicated that the orders of toxicity (LC50) to Plutella xylostella collected from Haikou were Bt > chlorfluazuron> spinosad >indoxacarb > chlorfenapyr > abamectin > diafenthiuron >tebufenozide > Cartap > Beta cypermethrin. The orders to Plutella xylostella collected from Sanya were Bt >spinosad > chlorfluazuron >indoxacarb > chlorfenapyr > abamectin > tebufenozide > diafenthiuron > Cartap > Beta cypermethrin. The orders to Plutella xylostella collected from Danzhou were Bt > spinosad > indoxacarb > chlorfluazuron > chlorfenapyr > abamectin > diafenthiuron > tebufenozide > Cartap > Beta cypermethrin. They were all sensitive to Bt and spinosad, Haikou population was more sensitive than Sanya and Danzhou, expect the insecticides of Beta cypermethrin, Cartap and Bt.