人类对果树病毒的研究已有半个多世纪,50多个国家相继开展了这方面的工作,现已探明,几乎所有果树都有数种乃至数十种病毒危害,其中苹果病毒造成的损失巨大。现在发达国家已形成了比较完整的无病毒苗木生产体系,我国也在病毒的调查鉴定、脱毒技术、培育无病毒苗木等方面取得 For more than half a century, more than 50 countries have carried out research on fruit tree viruses in this area. It has been proven that almost all fruit trees suffer from several or even dozens of types of viruses. Among them, the loss caused by the apple virus is huge . Now developed countries have formed a relatively complete virus-free seedling production system, our country is also in the investigation of the virus, virus-free technology, to develop virus-free seedlings and so on