目前，苹果上发现的病毒病有花叶病、锈果病、绿皱果病、小果病、环斑果病、粗皮果病、黄叶病等。果树一旦被病毒病侵染，就终生带毒持久危害，该病毒主要通过嫁接随同接穗、砧木、苗木远距离传播。嫁接繁殖数量越大，病毒传播的速度就越快。病毒病难以用化学药剂进行有效的预防控制，果树受病毒侵染后全树各部位都带有病毒,破坏和干扰树体的正常生长。导致树势衰弱、产量下降、品质变劣，商品率降低，严重的全株死亡。

At present, the virus diseases found on apple are mosaic disease, rust disease, green wrinkle, small fruit, ringspot, rough fruit, yellow leaf and so on. Once infected by the virus disease, fruit trees will carry the virus for a long time. The virus is mainly transmitted by grafting with scions, rootstocks and seedlings. The larger the number of grafts, the faster the virus spread. Virus disease is difficult to be effectively prevented and controlled by chemical agents. After infected by virus, all parts of the whole tree are infected with virus, which destroys and interferes with the normal growth of the tree. It leads to the decline of tree vigor, the decline of yield, the deterioration of quality, the decrease of commodity rate and the serious death of the whole plant.