保护地黄瓜霜霉病的发病初期为３月下旬至４月上旬，从４月中下旬直到黄瓜拉秧，均为发病盛期，且危害重、来势猛、传播快。而这时又是黄瓜的采收期，所以此病对黄瓜的产量影响很大，甚至造成绝收。其防治技术如下：１．施肥　施足底肥，包括有机肥，氮、磷、钾肥，稀土、锌、 Protection of cucumber downy mildew disease early onset for late March to early April, from late April until cucumber seedlings, are the peak incidence, and endanger the heavy, Meng Meng, spread fast. But this time is the harvested cucumber, so the disease has a great impact on the yield of cucumber, or even cause absolute failure. Its prevention and cure technology is as follows: 1. Fertilization Shi foot fertilizer, including organic fertilizer, nitrogen, phosphorus, potassium, rare earth, zinc,