M45型多旋翼植保无人机减量施药对稻飞虱防治效果的影响

目的 研究多旋翼植保无人机减量施药对雾滴沉积效果以及稻飞虱防治效果的影响，促进水稻减量施药技术发展。方法 采用M45多旋翼植保无人机开展水稻施药田间试验，选取15.0和22.5 L/hm² 的施药液量，以及人工施药推荐剂量100%、90%、80%的3种减量农药剂量，研究不同施药液量和减量农药剂量对雾滴沉积效果以及稻飞虱防治效果的影响。结果 水稻冠层上部的雾滴沉积量明显优于冠层下部，2种施药液量以及3种减量农药剂量对雾滴沉积量的影响不显著；施药1周后稻飞虱数量显著减少。在相同施药液量条件下，减量农药剂量的变化对稻飞虱防治效果影响不明显。80%的农药剂量能满足稻飞虱防治要求。结论 无人机水稻施药作业中可选择80%的农药剂量进行减量施药。本研究可为水稻减量施药、减少水稻植保作业成本提供有益参考。

Effects of reduced pesticide application on rice planthopper control by M45 multi-rotor plant protection UAV

Objective In order to explore the effect of reduced pesticide application on the control effect of rice planthopper by multi-rotor plant protection UAV and promote the development of reduced pesticide application technique for rice.Method Field experiment was carried out using an M45 multi-rotor plant protection UAV for rice pesticides application. We used two spray volumes of 15.0 and 22.5 L/hm², and three pesticide dosages of 100%, 90%, and 80% of the conventional artificial control dosage. The effect of different spray volume and reduced dosage on the droplet deposition and the control of rice planthopper were analyzed.Result The droplet deposition in the upper part of the rice canopy was significantly higher than that in the lower part of the canopy. The differences of two spray volumes and three dosages on the droplet deposition were not significant. At the same time, the number of rice planthopper decreased significantly after one week of treatment. Under the condition of the same spray volume, the effect of reduced dosage on the control effect of rice planthopper was not significant. Rice spray dosage of 80% of manual application met the requirement of rice planthopper control.Conclusion The spray dosage of 80% can be considered as feasible dosage in the UAV application for rice. The results provide useful reference for promoting the reductions of pesticide application for rice and the operating cost of rice plant protection.