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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。
In order to control the harm of the American white moth, the EC120 helicopter was used to air-spray the special suspension and control agent for the virgin urea plane to control the area of 10,000 hm2. The results showed that the droplet density was higher, the droplet size was higher, the uniformity was higher and the effective spray amplitude was larger when the spraying height was 15-20 m from the top of the forest trees. The diameter of droplet in the upper part of the tree was larger and the distribution was not Uniform; the lower part of the droplet is smaller, the uniformity is better; the droplet density in the upper, middle and lower sediment differences significantly. The results of inter-forest control showed that the corrected mortalities of H. litura about 20% after 15-20 m application from the top of forest trees were 40% after 48 h, and the corrected mortalities to P. americana were 40% and 72%, respectively h after the white moth of the corrected mortality rate of about 70%.