白粉病是保护地西葫芦的重要病害。从苗期至收获期均可发生,主要危害叶片,偶而也危害叶柄、茎部。初期在叶面上产生近圆形白色粉斑,其后向四周扩展成边缘不明晰的连片白粉,严重时整个叶片布满白粉。后期白粉变为灰白色。轻病时叶组织不见明显病变,重病时变脆,明显老化,功能下降。防治方法:①选用抗病品种。② Powdery mildew is an important disease of zucchini in the protected area. From seedling to harvest can occur, the main hazards leaves, and occasionally endanger the petioles, stems. Early on the foliage produce nearly circular white plaque, then extended to the surrounding edge of the contiguous white powder, the entire leaf was covered with white powder. The late white powder turns gray. Slightly diseased leaf tissue no obvious disease, when the disease becomes brittle, significant aging, decreased function. Prevention and treatment methods: ① selection of disease-resistant varieties. ②