黄瓜霜霉病是影响塑料大棚、温室黄瓜产量和品质的重要病害之一。常年造成减产10%～15%,严重年份可减产40%,甚至有个别棚绝产。1987～1988年,由于霜霉病危害,致使内蒙古呼盟的大部分棚、室黄瓜于结瓜盛期的6月中下旬扭秧,严重地影响了产量和经济效益。多年来,虽然不断引进新农 Cucumber downy mildew is one of the important diseases that affect the yield and quality of plastic greenhouse and greenhouse cucumber. Perennial caused 10% to 15% reduction in severe years can cut 40%, and even individual shed absolute production. From 1987 to 1988, due to the devastating effects of downy mildew, most of the canopy and house cucumbers in Inner Mongolia reached their peak in mid-to-late June, causing serious impact on yield and economic benefits. Over the years, although the continuous introduction of new farmers