现今防治苹果白粉病的两个主要手段是:1.施用药物预防侵染或在其发生初期制止发展;2.在果树休眠期对枝梢上的或在发芽后数周内对短果枝上的剪除病芽。在感病的桔苹(Cox’s Orange Pippin)品种上对冬季剪除被害枝的剪截部位和春季剪病枝的剪除时期进行了研究。从田间观察看出,上部带有病梢的枝条,病梢以下的3个芽;不带病梢的枝条,染病顶芽以下的5个芽(包括顶芽在内),比较有可能发病。据此进行田间防治,效果比只剪病梢病芽而不剪下部几个芽的好。春季,初侵染在吐绿后,开始发 The two main methods to prevent and control apple powdery mildew nowadays are as follows: 1, the drug is applied to prevent infection or stop the development in the early stage of its occurrence; 2) on the shoots during dormancy of fruit trees or on the short fruit branches Cut off the buds. In the susceptible varieties of Cox’s Orange Pippin, the cut-off site of cut off branches in winter and the cut-off period of cuttings in spring were studied. Observed from the field, the upper part of the branches with the disease tip, disease buds following the three buds; branches without disease tip, the top buds buds following 5 buds (including the top buds included), more likely to onset. According to the prevention and treatment of the field, the effect is better than cutting the buds without cutting a few buds. Spring, the initial infection after spit green, began to send