黄瓜肉质脆嫩,汁多味甘,具有清热、解渴、利水、消肿之功效,同时还兼有美容的功能,因此深受人们的喜爱,每年都被大面积种植。但在黄瓜的生长过程中,极易发生霜霉病,该病来势猛,传播迅速,在一两周内就会造成植株叶片大量枯死,严重地影响黄瓜的生长。病害流行时一般可造成20%～30 Cucumber meat crisp, juicy sweet, with heat, thirst, water, swelling of the effect, but also both beauty functions, so loved by the people, are planted a large area every year. However, in the process of cucumber growth, prone to downy mildew, the disease fierce, spread rapidly, within a week or two will result in a large number of plant leaves dead, seriously affecting the growth of cucumber. Diseases can generally cause 20% ~ 30 when the epidemic