百部·楝·烟乳油防治桃蚜及其在莴苣上的残留试验

百部·楝·烟乳油是一种天然植物杀虫剂。对桃蚜的药效试验结果表明 ,在室内 1.1%百部·楝·烟乳油稀释 15 0 0倍、30 0 0倍和 6 0 0 0倍液 ,药后第 1、3、5天的防治效果为 91.6 3%～ 99.6 1% ;在田间稀释 80 0倍和10 0 0倍液 ,药后第 1、3、5天的防治效果为 90 .6 3%～ 97.98% ,均相当于或略优于 5 0 %高渗抗蚜威可湿性粉剂2 5 0 0倍液的效果。此外 ,百部碱、楝素和烟碱在莴苣叶片上的残留在自然状态下消失较快 ,百部碱T 1/2为 0 .76d(天 ) ,楝素为 0 .5 8d(天 ) ,烟碱为 0 .48d(天 ) ,而且喷药后在叶片上的残留量少 ,因此可以在蔬菜生产中推广应用

The Controlling Effects of Emulsion of Stemona, Chinaberry alkali and Tobacco alkali on Myzus persicae and Their Residual Test in Lettuce

A botanical insecticide is made from stemona, Chinaberry and tobacco. The controlling effects of 1.1% emulsion diluted with 1500, 3000 and 6000 water on Myzus persicae were: indoors, 91.6%～99.6% after spraying 1,3 and 5 days; in the fields, the effects of it diluted with 800 and 1000 water were 90.6%～98.0% after spraying above same days. They were equal to or better than the results of 50% kangyawei wettable powder diluted with 2500 water. The residue of this insecticide disappeared quickly in the lettuce l...