症状 :发病初期 ,植株外叶萎蔫 ,晴天中无更为明显。严重的病株 ,茎基部、根茎髓部完全腐烂。防治方法 :(1 )选用抗病品种。 (2 )种子用菜丰宁Ｂ1拌种 ,每 1 /1 5ｈｍ2 用 1 0 0ｇ,先将种子用水浸湿 ,均匀拌在种子上即可。 (3 )药剂防治。发病初期拔除病株 ,在病穴四周撒少许熟 Symptoms: In the early stages of disease, the outer leaves of the plant wilted and no clearings were found in the sunny days. Serious diseased plants, stem base, roots and pith completely decay. Control methods: (1) use of resistant varieties. (2) Seeds Fenfengning B1 seed dressing, 1/1 5hm2 with 1 0 0g, the first seed soaked with water, evenly mixed in the seeds can be. (3) Pharmacy control. In the early stages of diseased diseased plants, scattered in the sickness around a little cooked