Study on the application parameters and control efficacy against southern maize rust by plant protection unmanned aerial vehicles
In order to use plant protection unmanned aerial vehicles(UAV)to effectively control maize southern rust,spray volume of pesticide application solution and pesticide selection for the disease prevention and control by plant protection UAV was investigated.The results showed that when the application solution was 2 L/667m2 at a flight altitude of 2 m and a flight speed of 3 m/s,the deposition density of the pesticide droplets on the lower three leaves,three-ear-leaves and upper three leaves of maize plants was 91.72,57.75 droplets/cm2 and 13.42 droplets/cm2,respectively,and the deposition density of the droplets did not change significantly when the application solution increased to 3 L/667m2 and 4 L/667m2.When the application solution was 2,3 L/667m2 and 4 L/667m2,the pesticide deposition utilization rate was 52.59％,53.89％and 57.88％,respectively.Considering the operation efficiency,the optimal application solution of plant protection UAV for southern maize rust control was 2 L/667m2.Under these conditions,the control effects of spraying prothioconazole 30％OD,propiconazole 20％ME,difenoconazole·azoxystrobin 32.5％SC and prothioconazole·tebuconazole 40％SC against southern maize rust reached 96.72％,70.68％,80.54％and 69.71％,respectively,14 days after spraying.Therefore,spraying prothioconazole 30％OD,difenoconazole·azoxystrobin 32.5％SC,propiconazole 20％ME and prothioconazole·tebuconazole 40％SC at a flight altitude of 2 m,flight speed of 3 m/s,operation row spacing of 5 m,and application solution of 2 L/667m2 can effectively control southern maize rust.
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