甘薯在贮藏过程中因块根体积大 ,皮薄水分多 ,组织柔软 ,加上贮藏不当 ,常易产生病害 ,造成薯块的大量腐烂。遭受病害的薯块表皮稍暗 ,组织稍变软 ,近薯表的薯肉变褐色或黑褐色 ,有的表皮呈粉红色或白色霉层。受冻薯块往往部分组织形成硬核 ,煮后仍坚硬 ,有时还发出一种酒精气 Sweet potato in the storage process due to large root volume, thin skin and more water, soft tissue, coupled with improper storage, often prone to disease, resulting in a large number of decay potato tubers. Sick potato tuberous skin slightly darker, tissue slightly softened, near the potato table brown or brownish brown potato, and some epidermis was pink or white mildew. Frozen potato blocks are often part of the formation of hardcore, still hard after cooking, and sometimes also issued a kind of alcohol gas