黄瓜霜霉病是大棚黄瓜的重要病害，该病发展迅速，往往在中；已病株出现后14天左右即可蔓延到全棚室发病，20天后植株叶片全部枯死。一般减产10G－30％，重者减产50％以上，严重影响了大棚黄瓜的生产。目前的常规防治方法成本高、污染重，因此，我们采用了无公害防治技术，收到 Cucumber downy mildew is an important disease of greenhouse cucumbers, the disease develops rapidly, often in; has emerged after about 14 days can spread to the entire studio incidence, 20 days after the plant leaves all died. The general cut 10G-30%, heavy cut more than 50%, a serious impact on the production of greenhouse cucumbers. The current conventional methods of prevention and control of high cost, heavy pollution, therefore, we adopted a pollution-free control technology, received