葡萄霜霉病是一种世界性的真菌性葡萄主要病害之一,各葡萄产区均有分布,尤其在多雨潮湿地区发生普遍。1834年在美国野生葡萄中首次被发现,我国1899年开始记载本病的发生。发病严重时削弱树势,果穗不能正常发育而品质变劣,甚至不能成熟,致使减产20%左右,同时影响下一年产量。发病原因:葡萄霜霉病的病原属鞭毛菌亚门的葡萄霜霉菌(图1),以卵孢子在病组织或土壤中的病残体上越冬,次年在12℃左右的 Grape downy mildew is one of the main diseases of the world’s fungal grapes. All grapes are distributed, especially in rainy and wet areas. It was first discovered in American wild grapes in 1834, and our country started to record the occurrence of this disease in 1899. Severe disease weakens the tree potential, the ear can not be normal development and deterioration of quality, or even not mature, resulting in about 20% reduction, while affecting the next year’s output. The cause of the disease: Grape downy mildew pathogen Flagellin submenor grapes downy mildew (Figure 1) to oospores in the diseased tissue or soil in the sick on the winter, the following year at about 12 ℃