对采自河北省、河南省和山西省的葡萄霜霉菌进行分离共获得11个菌株,在选定的8个葡萄品种上进行了致病型测定。经叶盘漂浮法与脱叶法比较,证明脱叶法更适合霜霉菌致病型的测定。确定了葡萄霜霉菌致病型的划分方法,将河北、河南和山西的葡萄霜霉菌的致病型分为两大类,为其他地区葡萄霜霉菌致病型的划分提供了依据,同时为科学防治葡萄霜霉病和搞好葡萄品种合理布局提供了理论基础。 A total of 11 strains were isolated from the grape downy mildew collected from Hebei, Henan and Shanxi Provinces. Pathogenicity was tested on the selected eight grape cultivars. Compared with defoliation method by leaf disk floating method, defoliation method is more suitable for the determination of downy mildew pathogenicity. The pathogenicity classification of grape downy mildew was determined. The pathogenicity of grape downy mildew in Hebei, Henan and Shanxi was divided into two categories, which provided the basis for the division of pathogenicity of grape downy mildew in other areas, Provide a theoretical basis for the prevention and control of grape downy mildew and the rational distribution of grape varieties.