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黄瓜霜霉病是一种暴发性、流行性很强的侵染性病害，是日光温室黄瓜最主要的病害，尤其在深冬季节，发病更为突出。现将该病深冬发生特点及防治对策简介如下：一、发生特点l．发病频次高。深冬季节，室外气温较低，温室管理以密闭保温为主，由于不能大放风，室内蒸发量小，水气
Cucumber downy mildew is an outbreak of epidemic of highly invasive diseases, is the most important greenhouse cucumber disease, especially in the winter season, the incidence is more prominent. Now characteristics of the disease occurred in the winter and prevention and treatment measures are as follows: First, the occurrence of characteristics l. Frequency of high incidence. In the deep winter season, the outdoor temperature is lower, and the greenhouse management is mainly based on airtight insulation. Since the indoor air can not be drained and the indoor evaporation is small, the moisture