Evaluation of control effect of low-volume spraying of difenoconazole· pyraclostrobin 15％ME on three apple leaf diseases by plant protection unmanned aircraft vehicle
To clarify the effect of nanofugicide difenoconazole·pyraclostrobin 15％ME,two kinds of spraying methods were adopted in this test,with water sensitive paper as an indicator of droplet deposition.The droplet density and droplet coverage rate of different fungicides sprayed by plant protection UAV and backpack electric sprayer were analyzed.Diseased leaf rate,disease index,control effect and overall benefit were investigated.The results showed that the flight height of plant protection UAV affected droplet deposition density and coverage.Droplet density and coverage of difenoconazole·pyraclostrobin 15％ME were different from those of difenoconazole·pyraclostrobin 25％SC.Every treatment had the best control effect on apple rust,with the efficacy above 97％.Control efficacy were above 90％on apple scab 15 days after treatment,but only 50％on apple Al tern aria blotch.The control cost,timeliness and energy saving of difenoconazole·pyraclostrobin 15％ME sprayed by plant protection UAV were significantly better than those of backpack electric sprayer.Therefore,application of difenoconazole·pyraclostrobin 15％ME by plant protection UAV can control apple scab and apple rust effectively and achieve the reduction of fungicide,with high overall benefit.
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