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马铃薯晚疫病是马铃薯生产中一个主要病害,可危害叶片、茎和薯块造成减产。叶片受害叶缘产生水渍状黄褐色病斑,迅速扩大成不规则大斑,叶片背面边缘产生白色霉状物。植株茎部受害,产生稍凹陷的褐色条斑,病斑上也长出白霉。病薯内部组织变褐坏死,病健组织无明显分界,无食用价值,土壤干燥时,呈干腐状。
Late blight of potato is a major disease in potato production, which can endanger the yield reduction of leaves, stems and tubers. Leaf damage blade edge water-like brown spots, quickly expanded into irregular big spot, leaves the back edge of white mildew. Plant stem damage, have slightly concave brown streaks, lesions also grow white mold. Internal tissue brown potato necrosis, disease-free tissue no obvious demarcation, no edible value, dry soil, was dry rot.