根朽病属于真菌引起的病害。主要特点是根茎部腐烂的皮层内布满白色扇形菌丝层，受为害的根先腐烂，然后向根茎部扩展，造成根茎部皮层腐烂。 根部受伤是发病的主要条件。特别是施肥位置不当，施肥距主干太近或施肥过量，造成根部肥害，皮层腐烂，病菌侵入为害。土壤板结、积水 Root disease is a disease caused by fungi. The main feature is the decay of the root cortex covered with white fan-shaped mycelium layer, the roots of the first decay, and then to the rhizome expansion, resulting in rhizome cortical decay. Root injury is the main condition of the disease. In particular, improper fertilization, fertilization from the trunk too close or excessive fertilization, resulting in root fat, cortex decay, pathogen invasion. Soil compaction, water