Study on Control Effect of 50% Azoxystrobin-mancozeb WDG on Potato Late Bright

[Objective] The aim was to explore the control effect of 50%Azoxystrobin- mancozeb WDG on potato late bright. [Method]Taking 50% Azoxystrobin- mancozeb WDG and fungicide 58% metalaxyl-mancozeb wettable powder which used in large area as the test pesticides, the control effect of different doses 50% Azoxystrobin- mancozeb WDG on potato late bright were studied,by setting six treatments.[Result ] 50%Azoxystrobin- mancozeb WDG 800 times liquid was one of the choices for controlling potato late bright, which had the highest control effect, with 76.02%, and had the highest yield of 21 648.0 kg/hm2.The result was the best if began spraying in their early stage, once for 7 d, and continued 3-4 times.[Conclusion] The results provided references for reducing the hazards of potato late bright, and guiding the prevention and control of the potato late bright in local potato production.