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西瓜菌核病在保护地和露地栽培的植瓜上均可发生,以大棚内发生较重,从苗期至成株期均可发生,主要危害西瓜的茎蔓、叶片和果实。一、发病症状幼苗染病:子叶发病,初呈水渍状,逐渐扩大呈圆形或不规则形斑,不久扩展至整个子叶,引起子叶枯死,幼苗猝倒,并以此病株向四周扩展,形成明显的发病中心。茎部染病:多在茎基部、瓜蔓分枝处或叶柄基部开始,最初病斑呈水渍
Watermelon sclerotinia can occur in protected areas and open-field cultivated melon, with heavier occurrence in the greenhouse, from the seedling stage to adult stage, the main damage to watermelon stem vine, leaves and fruits. First, the symptoms of seedling disease: the incidence of cotyledons, showed the beginning of water-like, and gradually enlarged round or irregular shaped spots, and soon extended to the entire cotyledons, causing cotyledons withered, seedling cataplexy, The formation of a clear center of morbidity. Stem infection: mostly in the base of the stem, melon branches or petiole base began, the initial lesions were water stains