飞机喷洒甲维·灭幼脲的雾滴参数测定及其防治美国白蛾效果的研究

Application research of Hyphantria cunea Drury prevention and control using emamectin benzoate-chlorbenzuron by airplane

为控制美国白蛾的危害,采用EC120直升机空中喷洒甲维·灭幼脲飞机防治专用悬浮剂,防治面积1万hm2。结果表明:施药高度在距林木顶端15—20 m时,雾滴密度较高,雾滴大小合适,均匀度较高,有效喷幅较大;树体上部的雾滴直径较大,分布不均匀;中、下部雾滴较小,均匀度较好;雾滴在上、中、下部的沉积密度差异显著。林间防治效果调查显示,飞机距林木顶端15—20 m施药24 h后美国白蛾的校正死亡率为20%左右,48 h后对美国白蛾的虫口校正死亡率可达40%,72 h后对美国白蛾的校正死亡率在70%左右。

The control efficiency of emamectin benzoate-chlorbenzuron against Hyphantria cunea Drury was tested by EC120 helicopter,with the dimension of 10 000 hm2. When the flight height was 15—20 m over forest canopy,the droplets density was higher,the diameter of droplet was suitable,the homogeneity of droplet was better,and the effective spraying was bigger. The diameter of upper droplets was bigger than that of middle or lower droplets,but the droplet had less homogeneity. Among the deposition density of droplets in upper,middle,lower levels,there was significant difference. The corrected control effect was 20%,40%,70% respetively after spray in 24,48,72 h using emamectin benzoate-chlorbenzuron by airplane.