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杨梅是我国的一种特产果树,它的树体经济寿命长、效益高、管理方便,近年来在我国南方山丘坡地发展很快。浙江省到1987年杨梅的栽植面积已达33万亩,成为山区农民致富的主要经济来源。但在杨梅果园内,人们看到了部分杨梅树体上出现小叶、簇枝、梢枯等不正常的病状,发病果树产量极低,大小年结果现象严重,树体衰弱,如浙江省杨梅重点产区慈溪县的彭东、彭桥、龙南等乡镇,二万多亩杨梅中,有10％左右的面积不同程度地发生病害,每年要减收杨梅
Yangmei is a kind of special fruit tree in our country. Its tree has long economic life, high efficiency and convenient management. In recent years, it has been developing rapidly in the hillside in southern China. Zhejiang Province, Yangmei in 1987 planted area has reached 33 million mu, becoming the main source of income for mountain farmers to get rich. However, in the Yangmei Orchard, people have seen some abnormalities such as lobules, tufts and shoots on the Myrica rubra trees. The yield of fruit trees is very low, the annual results are serious and the trees are weak. For example, Area Cixi Peng, Peng Bridge, Longnan and other towns, more than 20,000 mu of bayberry, about 10% of the area of varying degrees of occurrence of disease, to reduce the annual bayberry