黄瓜霜霉病又称“跑马干”,病害发生重的温室可在1～2周内成片枯黄,是黄瓜生产中的毁灭性病害。一、发病规律本病由真菌侵染引起。病孢子是靠气流在各茬黄瓜上传播的。孢子囊萌发最适温度是16～22℃,温度高于30℃孢子活动缓慢。若单从湿度方面看,相对湿度在83%以上时有利于发病 Cucumber downy mildew, also known as “horse running dry”, heavy green house disease can be 1 to 2 weeks into a piece of yellow, cucumber production is a devastating disease. First, the incidence of the disease caused by fungal infection. Spores are spread by air on all cucumbers. Spore germination optimum temperature is 16 ~ 22 ℃, the temperature is higher than 30 ℃ spore activity is slow. If only from the humidity point of view, the relative humidity of 83% or more conducive to the disease