大棚黄瓜是大棚蔬菜主要种类之一,防治黄瓜病害,是发展蔬菜生产的必需,也是菜农的迫切要求。现将大棚黄瓜的几种病害及防治技术介绍如下:1黄瓜霜霉病1.1症状在叶片背面出现水浸状病症,病斑受叶脉限制,呈多角形、后为淡褐色,潮湿时病斑生长黑色霉层。1.2发病条件低温或高湿是黄瓜霜霉病发生的重要条件,发病适宜温度16℃～22℃,如果温度高于27℃,只能存活5～10天,棚温达 Greenhouse cucumber is one of the main types of greenhouse vegetables, cucumber disease prevention and control, is the development of vegetable production is necessary, but also the urgent request of vegetable growers. Cucumber cucumber now several diseases and prevention techniques are described below: 1 cucumber downy mildew 1.1 Symptoms in the back of the leaves appear flooding-like disease, the lesion is limited by the veins, was polygonal, after the light brown, damp spots growth Black moldy layer. 1.2 Conditions Low or high humidity is an important condition for the occurrence of cucumber downy mildew, the incidence of suitable temperature 16 ℃ ~ 22 ℃, if the temperature is higher than 27 ℃, can only survive 5 to 10 days, shed temperature reached