果树冬前修剪,是一项重要的增产措施。它不仅能调整树形、均衡树势、使营养得到合理分配,而且还能结合修剪,消灭多种果树越冬病虫,来年大大减轻病虫害。现将几种可与修剪结合消灭的主要病虫症状简述如下。白粉病:主要发生在果树枝稍顶端,危害嫩梢叶片。受害的病梢节间明显缩短,有 Pruning of fruit trees before winter is an important stimulation. It can not only adjust the tree shape, balance the tree vigor, make the nutrition get the reasonable distribution, but also can combine the pruning, eliminate a variety of fruit trees overwintering pests and diseases in the coming year greatly reduce pests and diseases. Several types of major pests and diseases that can be eliminated in combination with pruning are summarized as follows. Powdery mildew: mainly occurs on the top of the branch of fruit trees, damaging the shoots of young shoots. Victims of disease internodes significantly shorter, there