根腐病:危害植株茎基部与芦头部分。发病初期,根及根茎部分变褐腐烂,叶柄基部产生褐色梭形病斑,逐渐叶片枯死、根茎腐烂。防治:发病初期用50%的多菌灵可湿性粉剂1000倍液或50%的甲基硫菌灵可湿性粉剂1000倍液喷雾防治。黑斑病:发病初期叶片出现紫黑色斑点,后扩大为近圆形暗褐色大斑。防治:发病初期用65%的代森锌可湿性粉剂500倍液或50%的甲基硫菌灵可湿性粉剂1000 Root rot: endanger plant stem base and reed head part. Early onset, part of the root and rhizome brown decay, petiole base brown shuttle flecks, gradually leaves withered, root rot. Prevention: early onset with 50% of carbendazim WP 1000 times or 50% thiophanate-methyl WP 1000 times spray control. Black spot: the early onset of purple purple spots on the leaves, enlarged to nearly circular dark brown spots. Prevention and treatment: early onset with 65% of the ADM zinc WP 500 times or 50% thiophanate-methyl WP 1000