防治好霜霉病是夺取大棚黄瓜高产的关键。要防治好大棚黄瓜霜霉病必须抓好以下几项措施。 1.消灭侵染来源黄瓜霜霉病菌随黄瓜残枝枯叶在土壤中越冬,病原菌借助于气流、降雨等进行传播。因此,消灭初次侵染来源是予防霜霉病的一项重要措施。大棚黄瓜由于有塑料的覆盖,能阻挡外界病菌侵入,在棚内消灭初次侵染来源显得更为重要。其主要办法是实行 Prevention and control of downy mildew is the key to winning high yield greenhouse cucumber. To control the greenhouse cucumber downy mildew must do a good job following several measures. 1. Eliminate the source of infection Cucumber downy mildew Cucumber residual leaves with the winter in the soil, the pathogen by means of airflow, rainfall and other spread. Therefore, eliminating the source of primary infection is an important measure to prevent downy mildew. Greenhouse cucumbers due to plastic cover, can prevent the invasion of germs outside, in the shed to eliminate the source of the first infection is even more important. The main approach is to implement