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识别要点:叶缘有“v”字形病斑,病斑上叶脉坏死,维管束变黑;根部染病外皮变黑,内部组织干腐,维管束变黑,髓部组织呈黑色干腐,甚至空心。湿度大时,病部产生黄褐色菌脓或油浸状湿腐。防治方法:1.种子处理。50℃温水浸种30min。也可用种子重量0.2%的50%福美双可湿性粉剂或35%甲霜灵拌种剂拌种。2.农业措施。与非十字花科蔬菜轮作;采用抗病品种;播种不宜过早,适期蹲苗;苗期小水勤浇,降低土温,及时拔除病苗。
Identification of the main points: leaf edge with “V” shaped lesion, necrosis of the veins on the lesion, vascular bundle darkening; roots infected skin darkening, internal tissue dry rot, vascular bundle darkening, pulp tissue was black dry rot, Even hollow. Humidity, the disease caused by yellow-brown pus or oil-like wet rot. Control methods: 1 seed treatment. 50 ℃ warm water soaking 30min. Also available seed weight 0.2% 50% thiram or 35% metalaxyl seed dressing seed dressing. 2. Agricultural measures. And non-cruciferous vegetables rotation; the use of disease-resistant varieties; sowing should not be too early, the appropriate squat seedlings; seedling small water pouring, reducing soil temperature, timely removal of disease vaccine.