近几年来,黄瓜霜霉病猖獗,严重威胁黄瓜生产,1979年大流行使黄瓜大幅度减产,有的生产队甚至毁种。黄瓜霜霉病在全国普遍发生,严重之年减产30～70％。华北、东北地区5～7月的温度适合发病,是否流行依降水情况而定。一般认为初侵染源由南方传来,春季多东风和东南风易造成病害大流行。 In recent years, cucumber downy mildew rampant, a serious threat to cucumber production, the cucumber in 1979 a substantial reduction of the pandemic, and some even destroyed the production team. Cucumber downy mildew occurred in the country generally, a serious annual reduction of 30 to 70%. North China, Northeast 5 to 7 months for the temperature of the disease, whether the epidemic depends on precipitation conditions. Generally believed that the source of primary infection came from the south, the spring easterly and southeast wind easily cause disease pandemic.