Bulletin of Reagent Control Test on Grape Downy Mildew and Powdery Mildew

[Objective] The research aimed to screen the reagents that could effectively control the downy mildew and powdery mildew of grape.[Method] In the field plot experiment,6 kinds of reagents were set up for controlling grape downy mildew,and 2 reagents were set up for controlling grape powdery mildew,the medication was applied once every 7 d interval in initial stage of 2 diseases occurring,and applied 3 times totally,the statistics were made for diseased leaf rate and disease index after 7-10 d medication applying,and control effect was analyzed.[Result] Among 6 reagents,Dimethomorph,Huishuangte,Gold-ridomil and Miejuncheng all had good control effect on grape downy mildew.In the area where downy mildew was serious,Huishuangte had best disease control effect.In the area where disease was not so severe,Dimethomorph and Gold-ridomil were in the optimal control effect and the next one was Miejuncheng.The tested 3 reagents all could control grape powdery mildew well.In the region where powdery mildew was serious,Triadimefon had best disease control effect and in the region where powdery mildew was mild relatively Amistar had best control effect and secondly was Dilikang.[Conclusion] The study provided the important guiding basis for controlling on these 2 diseases.