Abstract: Based on the common unmanned aerial vehicle (UAV),the appropriate flight parameters of UAV for the control of diseases and insect pests in the ratooning rice field were studied,on the basis of widely used parameter such as flight height,spray volume and droplet size and the control effect of plant protection UAV on diseases and pests under different flight speeds was compared.The results showed that the flight parameters of the UAV represented by Dajiang MS-G1 were set at1.8 m altitude and 0.379 L/min rated flow,which can achieve good control effect in the range of4~6 m/s flight speed.However,with the increase of flying speed,the control effect decreased.According to the comprehensive control efficiency and cost,the control efficiency of the treatment with a flight speed of5 m/s was better than that of other treatments.

Key words: plant protection UAV, disease and pest control, flight parameters, regenerating rice