印楝素和Bt乳剂防治有机水稻二化螟的药效试验  

Study on the Efficacy of Azadirachtin EC and Bt Emulsion against Chilo suppressalis in Organic Rice

作　　者：曾晓楠[1] 聂乾忠[2] 刘东辉[1] 

机构地区：[1]湖南生物机电职业技术学院,湖南长沙410127 [2]湖南农业大学,湖南长沙410128

出　　处：《安徽农业科学》2009年第25期12054-12055,共2页Journal of Anhui Agricultural Sciences

摘　　要：[目的]探索有机水稻二化螟的生物防治技术。[方法]以杂交水稻组合88S/0293为供试品种,研究不同剂量的0.3%印楝素EC和Bt乳剂对有机水稻二化螟的防治效果及安全性。[结果]在水稻二化螟1龄幼虫高峰期用0.3%印楝素EC2 250 ml/hm2对水稻二化螟具有较理想的防治效果,其杀虫、保苗效果分别达91.6%和80.0%;用0.3%印楝素EC1 500 ml/hm2也有较好的防治效果,其杀虫、保苗效果也分别达到84.0%和72.7%;Bt乳剂500倍液有一定防治效果,其杀虫、保苗效果分别达77.9%和68.1%。使用印楝素EC和Bt乳剂不仅对稻株无药害,而且有明显的增产作用,可以作为当前有机稻米生产过程中防治二化螟的理想药剂。[结论]该研究为有机水稻二化螟的生物防治奠定了基础。[ Objective ] The aim was to explore the biological control technology for Chilo suppressalis in organic rice. [ Method ] With hybrid rice combination 88S/0293 as tested variety, the control effect of 0.3% Azadiraehtin EC and Bt emulsion at different dosages against C. suppressalis in organic rice and the safety were studied. [ Result] The application of 0, 3% Azadiraehtin EC at 2 250 ml/hm^2 had more ideal control effect against C. suppressalis in organic rice at the peak of 1 st larvae age and its insecticidal effect and seedling protection effect reached 91.6% and 80.0%, resp. The application of 0.3% Azadirachtin EC at 1 500 mL/hm^2 also had better control effect and its insecticidal effect and seedling protection effect reached 84.0% and 72.7% , resp. The application of Bt emulsion diluted 500 times also had certain control effect and its insecticidal effect and seedling protection effect were 77.9 and 68.1% , resp. The application of Azadirachtin EC and Bt emulsion not only had no phytotoxicity on rice but also had obvious yield increasing effect, which could be as ideal insecticides for controlling C. suppressalis in the process of organic rice production at present. [ Conclusion] The research laid the foundation for the biological control of C. suppressalis in organic rice.

关 键 词：印楝素EC BT乳剂 二化螟 防治效果 

分 类 号：S481.9[农业科学—农药学]