白粉病是露地、保护地及全区蔬菜基地黄瓜的重要病害之一,流行性强,空气相对湿度52%~75%,气温20~25℃,最适宜此病发生,新疆地区的黄瓜都有此病发生,近年棚室栽培的黄瓜有发病增多趋势。白粉病主要危害黄瓜叶片,幼嫩叶片和老熟叶片都可受害,多从植株下部老叶开始发病,造成早期落叶,缩短结果期,降低果实质量和产量。白粉病在黄瓜的整个生育期均可发生,流行时间长,蔓延速度快,发 Powdery mildew is one of the most important diseases in open field, protected area and vegetable base cucumber in the whole region. The epidemic is strong. The relative humidity of air is 52% ~ 75%. The temperature is 20 ~ 25 ℃. The most suitable disease is cucumber in Xinjiang The disease occurred in recent years, greenhouse cucumber cultivation has an increasing trend. Powdery mildew mainly endangered cucumber leaves, young leaves and old leaves can be damaged, and more from the lower part of the plant began to attack the old leaves, resulting in early deciduous, shorten the fruiting period, reducing fruit quality and yield. Powdery mildew can occur throughout the growing season of cucumber, popular for a long time, spread rapidly, hair