甘薯在福建省是仅次于水稻的一种主要粮食作物,常年种植面积达400～500万亩.近年来,本病在我省沿海薯区发生和蔓延,严重危害部份薯区,成为阻碍甘薯生产发展的主要因素之一.1978年以来,我们对本病的发生和危害进行了调查.为了查明病害的性质,我们还进行了电镜观察. Sweet potato in Fujian Province is second only to rice as a staple food crops, annual perennial acreage of 400-500 acres .In recent years, the disease occurred in the coastal potato area and spread, a serious hazard to some of the potato area, a hindrance One of the major factors in the development of sweet potato production has been the investigation of the occurrence and harm of this disease since 1978. In order to identify the nature of the disease we also conducted electron microscopic observations.