作　　者： ; ; ; ; ;

机构地区： 华南农业大学资源环境学院农药与化学生物学教育部重点实验室

出　　处： 《华中农业大学学报》 2004年第5期 515-518,共4页

摘　　要： 印楝素A、印楝素B和印楝素A+B(1∶1,m/m)对斜纹夜蛾2龄幼虫具有较好的拒食活性,处理后24 h,拒食中浓度(antifeedant medial concentration, AFC50)分别为0.97 mg/L、2.42 mg/L和1.01 mg/L;印楝素A与印楝素B按质量比1∶1混合后具有增效作用.印楝素A、印楝素B和印楝素A+B对大菜粉蝶3龄幼虫具有一定的拒食活性,处理后24 h,AFC50分别为176.67 mg/L、224.48 mg/L和149.99 mg/L;印楝素A与印楝素B按质量比1.6∶1混合后具有一定的增效作用.3 mg/L印楝素A和印楝素B能延缓斜纹夜蛾的化蛹,降低蛹重,且印楝素B对蛹的影响高于印楝素A.1 mg/L印楝素A与印楝素B能明显降低斜纹夜蛾幼虫的体重,处理后3～5 d,印楝素B对斜纹夜蛾幼虫的体重的影响明显高于印楝素A. Azadirachtin A, azadirachtin B and azadirachtin A+B(1 ∶1,m/m) possessed good antifeedant activity against 2nd instar larvae of Spodoptera litura when AFC 50S were 0.97 mg/L, 2.42 mg/L and 1.01 mg/ L treatment after 24 h. Azadirachtin A, azadirachtin B and azadirachtin A+B (1. 6∶1,m/m) possessed antifeedant activity against 3rd instar larvae of Pi eris brassicae when AFC 50S were 176.67 mg/L, 224.48 mg/L and 149.99 mg/L treatment after 24 h. Mixed in proportion as 1∶1 or 1.6∶1(A∶B, m/m), azadirachtin A+B possessed synergism. 3 mg/L azadirachtin A and azadirachtin B could prolong the larvae time and reduce the pupae weight of S.litura.Effect of azadirachtin B on pupae of S.litura was higher than that of azadirachtin A treatment after 3～5 d.1 mg/L azadirachtin A and azadirachtin B could reduce t he larvae weight of S.litura.Effect of azadirachtin B on the larvae weight o f S.litura was higher than that of azadirachtin A treatment after 3～5 d.

关 键 词： 印楝素 印楝素 生物活性

领　　域： [农业科学] [农业科学]