黄瓜细菌性角斑病适宜高温高湿发病,一般晚于霜霉病流行。北方菜地发生较为普遍,露地和保护地都有发生。受害严重时,秧苗叶片变褐焦枯,造成不同程度的产量损失。 苗期发病时,子叶上形成圆形和半圆形的褐色斑,稍凹陷,后期子叶干枯。成株期叶片上初见水渍状圆形褪绿斑点,稍扩大后呈多角形褐色斑,外绕黄色晕圈。潮湿时 Cucumber bacterial angular leaf disease suitable for high temperature and humidity onset, generally later than the downy mildew epidemic. Northern vegetable occurrence is more common, open and protected areas have occurred. Serious damage, brown rice seedlings brown, resulting in varying degrees of yield loss. Seedling incidence, the formation of cotyledons and semi-circular brown spots, slightly depressed, cotyledons late dry. On the leaves of adult plants appeared on the first round of water-like chlorotic spots, slightly enlarged polygonal brown spots, halo around the yellow halo. When wet