甘薯是河南省主要粮食作物之一 ,年种植面积 80万ｈｍ2 。由于甘薯病毒病的侵染 ,使甘薯产量和品质受到严重影响 ,每年造成近 2 0亿元的经济损失。利用生物技术培育的脱毒甘薯 ,不仅产量大幅度提高 ,而且品质也明显改善。为了加速脱毒甘薯技术的推广应用 ,确保其增产效果 ,广大 Sweet potato is one of the main grain crops in Henan Province with annual planting area of ​​800,000 hm2. Due to the infection of sweet potato virus disease, the output and quality of sweet potato are severely affected, causing an annual economic loss of nearly 200 million yuan. The use of biological technology to cultivate the virus-free sweet potato, not only a substantial increase in yield, but also significantly improved quality. In order to accelerate the popularization and application of virus-free sweet potato technology to ensure that its yield-increasing effect, the majority