苹果叶部病害的发生及防治要点＠丁培棣苹果叶部病害的发生及防治要点一、叶部病害的种类在我省常年发生并造成不同程度为害的苹果叶部病害有：白粉病、斑点落叶病、褐斑病、圆斑病、轮斑病、灰斑病等。二、叶部病害的发生与为害１、白粉病我省各地普遍发生。主要为害新梢和嫩叶... Occurrence and prevention of apple leaf disease @ Ding Peidi Apple leaf disease occurrence and control points First, the types of leaf disease occurs in our province perennial and cause varying degrees of damage Apple leaf disease are: powdery mildew, spotted leaf disease , Brown spot, circular spot, spot blotch, gray spot and so on. Second, the occurrence of leaf disease and damage 1, powdery mildew occurred throughout our province. Mainly harmful shoots and young leaves ...