甘薯丛枝病在当地群众中称之为“疯病”、“疯株”、“甘薯公”.其病状特点为:主蔓矮缩,侧枝丛生,叶色淡黄,叶片薄而细小,缺刻增多,侧根须根细小而繁多,苗期发病者不能结薯或仅生小薯,中后期(即开始结薯后)发病者则薯块小而干瘪,薯皮粗糙有突起,颜色加深,薯肉煮不烂.为了查明病原,我们进行了电子显微镜观察研究. Sweetpotato birch disease in the local masses called “crazy disease”, “crazy strain”, “sweet potatoes.” The symptoms are: the main Man dwarf, collateral tufts, yellow leaves, thin and thin leaves, nick Increased, small and numerous lateral root fibrous roots, the incidence of seedling disease can not only tubers or tubers, in the late (ie after the onset of tubers) the incidence of small and shriveled potato tubers, rough skin protruding processes, deepening the color of potato Not bad to cook, in order to identify the pathogen, we conducted electron microscopy observation.