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大棚栽培,相对封闭,昼夜温差大,相对湿度高,植株上易凝结水滴,形成水膜,为喜湿性黄瓜霜霉病的发生、发展和危害提供了条件。一旦发生,一般减产15～20％,严重的可达50％以上。近年各地己摸索出一些生态防治的方法。 一、科学调节大棚的温、湿度。生态防治,要抓住外界最低温度稳定在10℃以上到大通风之前这段时间,科学调节棚内温湿度。上午将棚温控制在30～35℃,相对湿度65％～75％。室内温度大于35℃;开始放风,上午保持22～28℃,相对湿度60％;晚间温度下降,湿度上升,超过90％时,叶面渐渐形成水珠,这时要通风排湿,缩短叶面水膜的持续时间,限制发病,即
Greenhouse cultivation, relatively closed, large temperature difference between day and night, relative humidity, easy to condense water droplets on the plant to form a water film for the hygromycin cucumber Downy mildew occurrence, development and hazards provided the conditions. In the event of a general reduction of 15 to 20%, a serious up to 50% or more. In recent years, various localities have worked out some methods of ecological control. First, the scientific regulation of greenhouse temperature and humidity. Ecological prevention and control, we must seize the lowest outside temperature stable at above 10 ℃ to large ventilation during this period, the scientific regulation of greenhouse temperature and humidity. Morning shed temperature control at 30 ~ 35 ℃, relative humidity 65% to 75%. Indoor temperature is greater than 35 ℃; start the wind, the morning to maintain 22 ~ 28 ℃, relative humidity of 60%; night temperature drop, humidity rises, more than 90%, the leaves gradually formed water droplets, The duration of the water film, limiting the incidence, that is