莲菜腐败病又称腐烂病,是莲藕发生最普遍、为害最重的一种病害。该病主要为害地下茎,叶片和叶柄也可受害。地下茎受害,初期症状不明显,剖视茎部,可见近中心处微管束变褐,随病情发展,变色部位逐渐扩大,严重时地下茎全部成褐色腐烂,不能食用。由于地下茎受害,藕株输导机能受阻,致使地上部叶色变淡,严重时叶缘变褐干枯或卷曲,叶柄顶部亦呈弯曲状,并变褐干枯,最后全田一片枯黄,似火烧 Lotus rot disease, also known as rot disease, is the most common occurrence of lotus root, the most harmful damage to a disease. The disease is mainly harmful underground stems, leaves and petioles can also be affected. Underground stem damage, the initial symptoms are not obvious, cut the stem section, we can see near the center of the microtubule brown, with the progression of the disease, gradually expanding the site of discoloration, serious underground stems all brown rot, can not eat. Due to underground stem damage, lotus root conduction function blocked, resulting in pale aboveground leaves color, severe brownish brown leaf edge or curly, petiole top also curved, and browning and drying, and finally the whole field of a yellow, like fire