广东小菜蛾对阿维菌素的抗性研究

A Study on the Resistance of Diamondback Moth to Abamectin in Guangdong Province

广东省供港菜场小菜蛾对阿维菌素的抗性有逐年上升趋势 ,1992年抗性为 2倍 ,1994年为 12倍 ,1996年达 2 0倍 .广州内陆菜区与供港菜场 1992和 1999年小菜蛾对几种蔬菜常用药剂的抗性对比表明 ,2个菜区小菜蛾对阿维菌素、Bt制剂及昆虫生长调节剂定虫隆的抗性均有较大幅度地提高 ,而供港菜场小菜蛾的抗性更强 ;对敌敌畏、灭多威、氰戊菊酯及杀螟丹等有机化学农药的抗性 ,1992与 1999年则差别不大 ,象氰戊菊酯这样近年较少使用的药剂 ,抗性有减弱的迹象 .抗Bt品系小菜蛾对阿维菌素无交互抗性 ,对阿维菌素敏感的小菜蛾在阿维菌素的选择压力下亦会产生抗性 ,连续选育 2 0代 ,抗性倍数达 11.5 5倍 .用阿维菌素选育的抗性品系对定虫隆产生了明显的抗性 。

The DBM resistance of field populations in both Shenzhen and Guangzhou regions to abamectin and Bt ( Bacillus thuringiensis ) increased greatly in the past decade. However there haven’t been any significant change in the DBM resistance to some insecticides since 1992. The DBM strain susceptible (SS) to abamectin had gradually developed resistance to the antibiotic when DBM was treated regularly with sublethal dosage of the chemical. After 20 generations, the induced resistance level was as high as 11.55 fold compared with SS. There was no cross resistance between abamectin and each of Bt ( Bacillus thuringiensis ), DDVP, fenvalerate, and cartap, but the cross resistance of DBM population was found between abamectin and chlorfluazuron.