印楝素乳油对小菜蛾种群的控制作用  

Effects of azadirachtin against the diamondback moth, Plutella xylostella

作　　者：侯有明[1] 庞雄飞[2] 梁广文[2] 

机构地区：[1]福建农林大学植物保护学院,福州350002 [2]华南农业大学昆虫生态研究室,广州510642

出　　处：《昆虫学报》2002年第1期47-52,共6页Acta Entomologica Sinica

基　　金：国家自然科学基金 ( 39870 441);中国博士后科学基金 ( 2 0 0 0 );福建省教育厅资助项目 (K2 0 0 31)

摘　　要：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 。Effects of azadirachtin dosages on population dynamics of the diamondback moth (DBM), Plutella xylostella, were investigated in both laboratory and field. The results showed that azadirachtin strongly deterred the adult from laying eggs and significantly inhibited larval feeding on the plant with it. When 0.005 mL/L of azadirachtin was applied, 78.3% of the adults of DBM was kept away from the host plant and larval antifeedant ranged from 62.9% to 71.8%. Total food intake by DBM larva decreased to 59.0% of that in the control. The index of population trend of DBM decreased to 2.4 from 22.0 in the control. The interference index of population control was 0.1079. Based on the space-state equation of cybernetics, models of DBM population dynamics were set up, which indicated the deterrent activity of azadirachtin to the adult egg-laying played a key role in population control.

关 键 词：印楝素油 小菜蛾 种群控制 忌避作用 拒食作用 

分 类 号：S436.36[农业科学—农业昆虫与害虫防治] S482.39[农业科学—植物保护]