桃树“红叶病”,病因不明,只因叶红,群众名为“红叶病”。此病早在六十年代在北京四季青公社门头村果树队的桃园大久保桃树上发现。桃树受“红叶病”危害后,主要表现枝芽枯死,树势衰弱,产量下降,病情严重者可减产一半以上。多年来,对于“红叶病”生产上仅采取剪锯病枯枝、挖除严重病弱树等消极措施,因而未能有效地控制其发展蔓延,近年来病 Peach tree “leaf disease”, the etiology is unknown, only Ye Hong, the masses called “leaf disease.” As early as the sixties in the Beijing Sijiqing commune Mentougou fruit trees team Taoyuan Okubo peach found. Peach trees affected by “red leaf disease”, the main performance buds dead, tree weakness, production decline, serious illness can reduce production more than half. Over the years, for the production of “leaf-leaf disease”, only the adoption of negative measures such as cutting sawdust and removing severely weakened and diseased trees failed to effectively control its development and spread. In recent years,