黄瓜白粉病是近年发病较重的主要病害,特别是保护地黄瓜,由于生长期间易造成光照不足、通风不良、温度偏高偏低等,使植株生长较弱,发病率明显高于露地黄瓜,一般因病减产10-20％。高者达30％以上。过去防治黄瓜白粉病,多采用化学药剂,不仅提高了生产成本,也造成不同程度的环境污 Cucumber powdery mildew is more serious disease in recent years, especially cucumber protection, due to insufficient growth during the light caused by inadequate ventilation, poor ventilation, the temperature is low and so low, the growth of plants is weak, the incidence was significantly higher than the open field cucumber, The general cut 10-20% due to illness. High up to 30% or more. Past cucumber powdery mildew prevention and control, the use of chemical agents, not only increased production costs, but also caused varying degrees of environmental pollution