甘薯花叶病在河南许昌、郑州、新乡等地区发生很普遍。在甘薯生长期间除黑斑病外,其次算是甘薯花叶病害的危害最为严重;据有经验的老农谈:此病约在数十年前就有发现,其后逐渐普遍,近年来在苗床和大田期为害严重,对生产有一定的影响。1958—1961四年来,作者在河南省许昌、禹县、漯河、郾城、西华等地调查试验,苗床期平均发病率为13.45％,大田期为13.95％;感染此病的平均损失率达到7.4％。此病有二种类型:甘薯轻型花叶病毒初期,叶片网状脉表现清晰,呈明脉状。此后沿叶脉呈一片不规则的褪 Sweet potato mosaic disease occurred in Xuchang, Henan, Zhengzhou, Xinxiang and other areas are common. In addition to black spot disease during the growth of sweet potato, followed by the most serious hazards of sweet potato mosaic disease; According to experienced farmers talk about: the disease was discovered about a few decades ago, then gradually common in recent years in the seedbed and Field serious damage, have a certain impact on the production. In the four years from 1958 to 1961, the authors investigated in Xuchang, Yu County, Luohe, Tancheng, Xihua and other places in Henan Province. The average incidence of disease was 13.45% in seedling stage and 13.95% in field stage. The average rate of infection was 7.4%. There are two types of the disease: sweet potato mosaic virus early, clear reticular veins, showing bright veins. There was an irregular fade along the veins