葡萄霜霉病是由葡萄生单轴霉所致的真菌病害。该病在我国葡萄产区发生普遍，为害严重。在郓城葡萄产区，每年８～９月是该病的发生高峰期，常造成葡萄提前落叶，严重影响葡萄树势和产量，一般葡萄园减产１０％～３０％，严重的减产５０％以上。目前在郓城防治葡萄霜霉病的常用 Grape downy mildew is a fungal disease caused by Plasmopara viticola. The disease occurred in our country’s grape-producing areas widespread, serious damage. In Tancheng Grape Region, the annual peak of the disease occurs from August to September of each year, which often leads to early deciduous grapes and seriously affects the grapevine yield and yield. Generally, the yield of vineyard is reduced by 10% -30% and that of serious grapes is reduced by 50% or more . Currently in Tancheng prevent grape downy mildew commonly used