广州地区小菜蛾对Bt和阿维菌素敏感性的测定  

Studies on the Susceptibility of Guangzhou Diamondback Moth to Bacillus thuringiensis and Abamectin

作　　者：刘宏海[1] 黄彰欣[1] 

机构地区：[1]华南农业大学昆虫毒理研究室

出　　处：《中国蔬菜》1999年第2期9-11,共3页China Vegetables

摘　　要：采用叶片残留法测定了广州地区小菜蛾对Ｂｔ和阿维菌素的敏感性。结果表明，以ＬＣ５０比值分析，广州地区田间小菜蛾对福建Ｂｔ、湖北Ｂｔ、深圳Ｂｔ和揭阳Ｂｔ的抗性倍数分别为１．４４、２．９０、３．８２、３．００；对阿维菌素的抗性，以ＬＣ５０比值分析，３龄、４龄幼虫分别为２．３９倍和２．８６倍；以ＬＣ９５比值分析，３龄、４龄幼虫分别为４．２４倍和７．１１倍。从毒力回归直线方程斜率值分析，广州地区小菜蛾对几种Ｂｔ和阿维菌素有产生较高抗药性的发展趋势。Insecticide resistance of Guangzhou detected by the leaf residue bioassay showed that the resistance ratios were 1.44～3.82 folds to different Bt formulations;The resistance ratios of the 3rd and 4th instar larvae were 2.39 and 2.86 folds to Abamectin at LC 50 ,and were 4.24 and 7.11 folds at LC 95 . It was noticed that the slopes of LD P line from the Guangzhou Diamondback Moth population were less than that of LD P line from standard susceptible population. This suggests that the resistance of Guangzhou Diamondback Moth population to Bt and abamectin be heterogeneous. The developing insect resistance will be the greatest threat to the effectiveness of bioinsecticide Bt and abamectin.

关 键 词：BT 阿维菌素 小菜蛾 抗药性 敏感性 测定 

分 类 号：S433.4[农业科学—农业昆虫与害虫防治] S436.3[农业科学—植物保护]