近年来,棚室黄瓜细菌性角斑病发生较重,由于其症状与霜霉病类似,许多菜农误以为是霜霉病,导致防治失败。黄瓜细菌性角斑病与霜霉病病斑,开始均呈水渍状,且由于受叶脉限制,均呈多角形。但角斑病病斑相对比较小,颜色较浅(发白),病斑比较薄,后期穿孔,对着光透视,有透光的感觉,病斑上常有乳白色细菌性粘液;而霜霉病病斑相对比较大,颜色较深(黄褐),病斑比较厚,不穿孔,对着光透视,没有透光的感觉,病斑上无粘液,叶背面病斑表面有灰黑色霉层。棚室黄瓜的发展是造成角斑病发病严重的主要原因。由于棚室轮作困难,而病菌可随病残体留在土壤中越冬,成为第二年初侵染来源。种子也可以带菌,当种子萌发时即可侵染子叶,并通过通风、农事操作等传播,进行再侵染,造成全棚发病。防治黄瓜细菌性角斑病,可采用 In recent years, greenhouse cucumber angular leaf spot disease occurred heavier, because of its symptoms and downy mildew similar to many vegetable farmers mistakenly think it is downy mildew, resulting in prevention and treatment failure. Cucumber bacterial angular leaf spot and downy mildew spot, began to show water-like, and due to the limitations of the veins, were polygonal. However, the incidence of angular leaf spot is relatively small, lighter color (whitish), lesser thinner, late perforation, facing the light, there is light feeling, milky white bacterial mucus often on the lesion; and downy mildew Disease lesion is relatively large, dark color (yellow brown), lesion thicker, non-perforated, facing the light, no light feeling, no mucus on the lesion, . The development of greenhouse cucumber is the main reason for the incidence of angular leaf spot disease. As a result of difficulties in the rotation of the greenhouse, the bacteria can stay in the soil with the sick residue and become the source of infection in the second year. Seeds can also carry bacteria. When the seeds germinate, they can invade the cotyledons and propagate through ventilation and agricultural operations to re-infect the whole shed. Control of bacterial angular leaf disease cucumber can be used