早春大棚或露地黄瓜定植后,叶片上出现水浸状病斑,有人误认为是霜霉病,使用防治霜霉病的有效药剂却全然无效。其实,这不是霜霉病,而是细菌性角斑病。怎样识别这两种病害呢?首先应根据病害的症状来鉴别。黄瓜霜霉病的发病初期,叶片正面出现水浸状褪绿斑点,逐渐扩大呈角状或不规则的黄褐色枯斑。空气潮湿时,可见灰黑色霉层。湿度越大,颜色越深。霉状物是鉴别黄瓜霜霉病的主要 Early spring greenhouses or open field cucumber colonization, the leaves appear flooded lesions, some mistaken for downy mildew, the use of effective agents to prevent downy mildew was completely ineffective. In fact, this is not downy mildew, but bacterial angular leaf spot. How to identify these two diseases? First of all should be based on the symptoms of the disease to identify. Early onset of cucumber downy mildew, the front of the leaves appeared flooding-like chlorotic spots, and gradually enlarged horny or irregular brownish yellow spots. When the air is wet, gray moldy layer can be seen. The greater the humidity, the darker the color. Moldy is to identify the main cucumber downy mildew