黄瓜霜霉病是黄瓜的毁灭性病害,也是最常见的病害之一。一旦发病,一般减产15%以上,严重的达50%以上,必须采取综合措施才能有效防治。一、科学调节大棚的温湿度霜霉病的发生与流行与大棚内的温度和湿度关系极为密切。当 Cucumber downy mildew is a devastating disease of cucumbers and is one of the most common diseases. Once the disease, the general reduction of more than 15%, severe up to 50% or more, we must take comprehensive measures to effectively control. First, the scientific regulation of greenhouse temperature and humidity Downy mildew and the prevalence of the epidemic and the greenhouse temperature and humidity are closely related. when