本文目的在于提醒读者注意病毒的潜在危险,以避兔过去并不将病毒看成植物病态因素的状况。在进行这方面工作时,应当注意没有证据说明树木不感病,相反由于树木寿命长,将长期受害。关于病毒侵染农作物,所知甚多。侵染果树也已研究五十多年,但在英国,对其它木本观赏植物包括乔、灌木的研究近年才开始。现已发现相当数量为病毒,证明侵染是一种规律。在英国已知育44个属的木本植物中有类似病毒类病原引起的病害。由于苹 The purpose of this article is to remind the reader of the potential danger of a virus so as to avoid the situation where the virus was not regarded as a pathological condition in the past. In carrying out this work, care should be taken that there is no evidence that the trees are not affected by the disease, but conversely the long-term consequences of the long life of the trees. About the virus infects crops, I know a lot. Infestation of fruit trees has also been studied for more than fifty years, but in the United Kingdom, studies of other woody ornamental plants, including trees and shrubs, have only recently begun. It has been found that a considerable number of viruses prove that infection is a law. In the United Kingdom have been found in 44 genus of woody plants have similar virus-like pathogen-caused diseases. Because of Apple