不同虫态烟蚜对杀虫剂敏感性及其与解毒酶活力关系

Insecticide susceptivity in Myzus persicae of different life stage and correlation with detoxification enzyme activity

为更好地指导生产,本文研究了不同虫态烟蚜Myzus persicae对吡虫啉和丁硫克百威敏感性及其与羧酸酯酶、多功能氧化酶、谷胱甘肽S-转移酶比活力相关性。结果表明,3龄若虫对吡虫啉敏感性水平最低,4龄若虫对丁硫克百威敏感性水平最低。不同虫态烟蚜解毒酶活力随龄期逐渐增强,之后逐渐减弱,3龄若虫高于其他任何虫态,且多功能氧化酶和羧酸酯酶比活力与杀虫剂敏感性间存在强的负相关性。田间最佳防治虫态为1龄若虫、2龄若虫和成虫。

To guide the practice better,this work aims at the insecticide susceptible level of Myzus persicae in different life stages to imidacloprid and carbosulfan,and the effect of detoxification enzymes to insecticide susceptivity. Results showed that the susceptivity of M. persicae in all life stages to imidacloprid and carbosulfan decreased with the age firstly,and then increased continuously. The 3rd larvae were the most unsusceptible to imidacloprid,and the 4thexhibited the lowest susceptivity to carbosulfan. The mixed function oxidase and carboxylesterase specific activities of 3rdlarvae ＇ s were larger than any other states of the insect. There was a negative correlation between LC50 of M. persicae in different life stages to the two insecticides and specific activities of mixed function oxidase and carboxylesterase. And the best stages for control are the young larvae and the mature.