甘薯镰刀菌病害包括甘薯根腐病、蔓割病和褐斑病。根腐病发生在甘薯地下根部,呈褐色龟裂病斑。蔓割病发生在甘薯近地表处,发病时茎部裂开、可见维管束。甘薯褐斑病一般是在薯块、薯苗茎基部长出黑褐色病斑。一、甘薯根腐病主要发生在河北、山东、河南、江苏、安徽、陕西等地,轻者减产10%,重者减产可达40%,甚至造成绝收。1.田间症状主要发生在大田期,甘薯须根、根尖先发病,扩展至全根变黑 Sweet potato Fusarium diseases include sweet potato root rot, sprouting and brown spot. Root rot occurs in the underground roots of sweet potato, brown cracked lesions. Creeping occurs in the sweet potato near the surface, the incidence of stem dehiscence, visible vascular bundle. Sweet potato brown spot disease is generally in the tubers, potato seedling stem grow dark brown spots. First, sweet potato root rot occurs mainly in Hebei, Shandong, Henan, Jiangsu, Anhui, Shaanxi and other places, the light output reduction of 10%, the heavy output reduction of up to 40%, or even cause absolute failure. 1 field symptoms occurred in the field, sweet potato fibrous roots, apical first onset, extended to black rooted