飞机超低容量喷洒灭幼脲Ⅲ号防治刺槐外斑尺蠖试验

Experiment on the Diflubenzuron Control of Ectropis excellens by Ultravolume Aerial Spray

运用飞机超低容量喷洒灭幼脲Ⅲ号对刺槐外斑尺蠖幼虫进行了防治试验，结果表明，２０、２５、３０、３７．５ｇ／亩四种用药量１５天后的校正死亡率分别达到９９．４６％、９８．６６％、９９．２８％、９９．５４％。药效可持续影响到蛹及羽化成虫。

The experiment was conducted against the lavae of Ectropis excellens Butler by diflubenzuron through ultravolume aerial spray.The result shows that corrected mortality of the lavae in concentrations of 20,25,30 and 37.5g/mu are 99.46%,99.66%,99.78% and 99.54% respectively.Furthermore,The effectiveness of the chemicals lasts to have an influence on both pupar and emerging adult,but it has no harmful effect on natural enemies such as mantises et al.