一、症状 典型症状:先由根部腐烂,延至茎腐,以后顶梢尖缩,叶片枯落,最后全株枯死;病茎髓腔常现白絮状菌丝体。 根腐特点:多由伤口开始,根颈组织健时白色,病后初呈淡肉紅色,再转淡黄褐色。腐斑出現后外表呈水渍状,皮质部分消解后仅余发状纤维。 First, the typical symptoms of symptoms: first decay by the roots, extended to stalk rot, tip tip shrinking, leaf litter, and finally the whole body died; diseased stem often white flocculent mycelium. Root rot characteristics: From the beginning of the wound, root neck tissue health white, pale reddish early after the disease, and then turn light brown. After the appearance of rot stain appearance was water-like, after cortical partial digestion only hair-like fibers.