关键词: 无人机, 施药防治, 美国白蛾, 森林保护

Abstract: [Objective] This study investigated the flight parameters and control effects against Fall Webworm (Hyphantria cunea) by using UAV in poplar plantation. The results would provide a new way to control Fall Webworm.[Method]In this study, the droplets drifting distance, deposition density, penetrability and distribution of aerial spray by using UAV (YM-V6) for controlling Fall Webworm in the forest were investigated with water-based staining tracing method.[Result]The result showed that when the UAV was 2.5-3.5 m from the top of the canopy(relative flight height), and the flight speed of the UAV was within 1.5-3 m·s^-1, the droplets drift distance was limited in 2-3 m, spray penetration could reach 10 m, and the density and homogeneity of droplets were well, and as a result, the applying pesticide effect was well. Analyzing the droplets deposition effect in upper, middle and lower of the target showed that when the UAV flight speed was in 2.5 m·s^-1, and the relative flight height was 3.0 m in the plantation, the diameter of droplets in the upper part of forest was bigger, the homogeneity was lower; the diameter of droplets in middle and lower of forest was smaller, and the homogeneity was higher. The deposition density of droplets in up, middle, and lower part was significant different.[Conclusion]The applying pesticide effect was well when the UAV was 2.5-3.5 m from the top of the canopy,and the flight speed was within 1.5-3 m·s^-1. In spraying insecticides of Abamectin and Emamectin-benzoate by the UAV to prevent and control Fall Webworm, we surveyed the insecticides effect after 24, 48 and 72 h, the corrected mortality was about 30%,50% and 70%. The control effect of the single dose of Emamectin-benzoate was better than the single dose of Abamectin slightly.

Key words: UAV, prevention and control, Hyphantria cunea, forest protection