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黄瓜细菌性角斑病在大棚黄瓜、陆露黄瓜均有不同程度的发生,发病率一般在30—50％,严重者达100％,而且在黄瓜全生育期均可为害,是黄瓜生长上的一大障碍。该病害主要为害叶片,也为害果实和茎蔓。叶片受害时,在叶正面病斑淡褐色,背面受叶脉限制呈多角形,初呈水渍状,表面可见乳白色细菌菌浓。果实上病斑可向内扩展,沿维管束的果肉逐渐变色,并可蔓延到种子。幼苗被害,子叶上初生水浸状圆斑,稍凹陷,后变褐色干枯,幼茎蔓延被害,可引起幼苗软化死亡
Cucumber bacterial angular leaf disease in greenhouse cucumber, Lulu cucumber have varying degrees of occurrence, the incidence is generally 30-50%, severe up to 100%, but also in the whole cucumber growth period can be harmful to the growth of cucumber A big obstacle. The disease is mainly harmful to the leaves, also harmful fruit and stem vine. Leaf damage, in front of the leaves light brown, the back of the veins restricted polygonal was initially showed water-like, visible milky white surface bacteria dense bacteria. Lesions on fruit can be expanded inwards, and the flesh of the vascular bundle gradually discolors and can spread to the seeds. Seedlings were killed, cotyledons on the newborn flooding-like spots, slightly depressed, brown after drying, young stems spread damage, can cause seedling softening death