白粉菌属于真菌门、子囊菌亚门、核菌纲、白粉菌目。均为植物病原菌，常寄生于植物茎叶。感病植物肉眼看上去，好象涂了一层白粉，因此称作白粉病。白粉菌为植物专性寄生菌，能为害多种经济植物，在生长季节３－５天可进行一次重复侵染，故某些年份在一些地区流行，造成严重的 Powdery mildew belongs to the fungal door, Ascomycetes sub-Men, nuclear mycobacterium, powdery mildew. Are plant pathogens, often parasitic on plant stems and leaves. Sick plants appear to the naked eye as if coated with a layer of white powder, hence the name powdery mildew. Powdery mildew is a plant-specific parasitic bacteria, can damage a variety of economic plants, 3-5 days in the growing season can be a repeat infection, so some years in some areas of popular, causing serious