黄芪为野生或栽培种，在河北省为传统中药材之一。黄芪在整个生长期受白粉病的为害相当严重，直接影响产量及品质。１症状黄芪白粉病不仅为害叶片，也为害花蕊、荚果、茎秆等部位，整株布满白粉，到秋天黄芪田发病率达１００％。２病原菌黄芪白粉病是由白粉菌属豌豆白粉菌（Ery Astragalus is a wild or cultivated species, one of the traditional Chinese herbal medicines in Hebei Province. Astragalus in the whole growing season by the powdery mildew damage is very serious, directly affect the yield and quality. 1 Symptoms Astragalus powdery mildew is not only harmful to the leaves, but also damage stamens, pods, stems and other parts of the whole plant covered with white powder, to the fall of the incidence of astragalus reached 100%. 2 pathogens Astragalus powdery mildew is from powdery mildew powdery mildew (Ery