大力推广无病毒果树苗木发展果树生产，已成为广大农村牧区提高经济效益、脱贫致富的一条捷径。但是，果树生产中一直存在许多不如人意之处，如产量不高、质量欠佳等，其中自然条件、生产技术等因素的局限自不可忽视，但病毒侵害亦是相当重要的原因。目前，病毒侵害果树的... Vigorously promoting virus-free fruit tree seedlings to develop fruit trees has become a shortcut for rural areas and pastoral areas to increase economic efficiency and get rid of poverty and prosperity. However, many unsatisfactory results have been found in the production of fruit trees, such as low yield and poor quality, among which the limitations of natural conditions, production technology and other factors can not be ignored. However, the virus attack is also a very important reason. At present, the virus attacks fruit trees ...