三种植物性杀虫剂对菜青虫的毒效  

Effects of Three Botanical Insecticides Against Pieris rapae L.

作　　者：龙丽萍[1] 凌炎[2] 唐文伟[2] 

机构地区：[1]广西农业科学院植物保护研究所 [2]广西大学农学院,广西南宁530005

出　　处：《湖南农业大学学报（自然科学版）》2006年第4期402-405,共4页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：广西青年科学基金项目(桂科青0007016);广西新世纪十百千人才工程基金项目(2001215);广西农业科学院科技发展基金项目(2002028;2002025)

摘　　要：为了解闹羊花素-Ⅲ,印楝素和鱼藤酮对菜青虫的作用方式,采用叶碟法和叶碟饲喂法,室内测定了这3种植物杀虫剂对菜青虫的非选择性拒食活性和毒杀活性.结果表明,0.1%闹羊花素-Ⅲ乳油对菜青虫的拒食活性和毒杀活性均强,而0.3%印楝素乳油和2.5%鱼藤酮乳油对菜青虫的拒食活性分别是毒杀活性的185.44倍和13.78倍.盆栽试验结果显示,0.1%闹羊花素-Ⅲ乳油2000～6000倍液对菜青虫有较好的毒杀和保叶效果,药后1～3d菜青虫的死亡率为92.45%～100%,第3天的保叶效果为96.63%～98.18%;0.3%印楝素乳油1000～2000倍液药后1d对菜青虫的毒杀作用效果较差,菜青虫死亡率仅为20.00%～34.00%,但第3天的保叶效果较好,为91.34%～96.13%;500～1500倍液2.5%鱼藤酮乳油对菜青虫的毒杀和保叶效果均差.The result of bioassay indicated that 0.1% rhodojaponin-Ⅲ EC had the same effect of antifeedant and toxic activity against the 3rd instar larvae of Pieris rapae L., while but the antifeedant activity of 0.3% azadiracbtin EC and 2.5% rotenone EC on this pest were stronger than its toxic activity, the variation of them were 185.44-fold and 13.78-fold, respectiyely. The result of pot testing showed that 0.1% rbodojaponin-Ⅲ EC bad obvious control effect on the pest and good effects on protecting leaves, the pest mortality rate in the first to the third day was 92.45%- 100% after treatment, and the leave protecting effect was 96.63%-98.18% in the third day with dilutions of 2 000-6 000 times. 0.3% azadirachtin EC gave only 20.00%-34.00% mortality rate on the pest in the first day, but provided 91.34%-96.13% leave protecting effect in the third day with dilutions of 1 000-2 000 times. 2.5% rotenone EC gave the lowest effect against the Pieris rapae L.with dilutions of 500- 1 500 times.

关 键 词：植物性杀虫剂 菜青虫 毒力 防治效果 

分 类 号：S482.39[农业科学—农药学]