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通过室内外系统试验探讨了印楝素乳油对小菜蛾Plutellaxylostella种群的控制作用。结果表明 ,其控制作用主要表现在对成虫产卵的显著忌避作用、对幼虫的拒食作用以及对生长发育的影响和减少幼虫危害力等方面。印楝素乳油 0 0 0 5mL L处理对成虫的忌避率为 78 3% ,对幼虫的选择性和非选择性拒食率分别为 71 8%和 6 2 9% ,幼虫总取食量是对照的5 9 0 % ,使小菜蛾种群趋势指数 (I值 )降为 2 4,干扰作用控制指数 (IIPC)为 0 10 79。采用状态空间分析法就印楝素乳油施用后小菜蛾种群数量动态的模拟分析亦表明 ,其显著的控制作用表现在种群发展初期对成虫的忌避作用
The control effect of azadirachtin on Plutella xylostella population was studied through indoor and outdoor systematic experiments. The results showed that the control effect mainly manifested in the significant evasion of adult eggs, the antifeeding effect on larvae, and the growth and development of the impact and reduce the harmful effects of larvae and so on. Azadirachtin EC 0 0 0 5mL L treatment of the rejection rate of 78 3%, selective and non-selective anti-larvae feeding rate of 71 8% and 62 9%, the total larval intake of food control The population trend index (I value) of Plutella xylostella was reduced to 24 and the IIPC was 0 10 79. Simulated analysis of population dynamics of Plutella xylostella after applying azadirachtin also showed that its significant control effect was the repellent effect on adults at the initial stage of population development