一、识别方法苹果白粉病主要为害新梢及嫩叶,也可危害花及幼果。新梢受病害侵蚀后节间缩短,叶片变的细长,叶缘上卷,质地硬而脆。受害部分都反盖一层白粉,后期变为黄褐色。嫩叶受害,叶背也覆盖一层白粉,逐渐皱缩。扭曲,早期脱落,成叶受害,叶背产生自粉状病,叶 First, the identification method Apple powdery mildew is mainly harmful to shoots and young leaves, but also can endanger flowers and young fruits. Shoot damage by disease after internodes shortened, leaves become slender, leaf margin on the volume, the texture hard and brittle. The victim parts are covered with a layer of white powder, later turned to brown. Injured young leaves, leaf back is also covered with a layer of white powder, gradually shrinking. Distorted, early off, into the leaves victims, leaves back from powdery mildew, leaves