甘薯病毒病是影响甘薯产量和品质的重要因素,在大田的发病率几乎达100%,一般减产达20%以上。种薯连续种植多年后,由于受病毒侵染会出现植株矮化,叶片卷曲,皱缩,花叶,叶脉坏死等症状导致长势衰退,产量和品质降低甘薯是无性繁殖作物,遭受病毒侵染后,可以代代相传,严重危害生产的发展。因此,甘薯种薯经过一系列技术措施清除薯块体内的病毒后,在隔离措施下,经过几代种植获得的无病毒或极少有病毒侵染的种薯就是脱毒种薯。它的优点是叶片平展、肥大,叶色浓绿,根系发达,植株健壮,生长势强, Sweet potato virus disease is an important factor affecting the yield and quality of sweet potato. The incidence rate in the field is almost 100%, and the general yield reduction is more than 20%. After years of continuous planting of seed, plant dwarfing, leaf curling, shrinkage, mosaic, vein necrosis and other symptoms lead to the recession, yield and quality decrease due to virus infection. Sweet potato is a vegetative propagation crop, and after being infected by virus , Can be handed down from generation to generation, seriously jeopardizing the development of production. Therefore, sweet potato seed through a series of technical measures to clear the tubers of the virus, the isolation measures, after several generations of planting obtained without virus or very little virus-infected seed is virus-free seed. It has the advantage of flat leaves, hypertrophy, dark green leaves, roots developed, robust plants, strong growth potential,