苹果干腐病又称胭腐病，一般为害定植后管理不善的幼树和衰弱的老树。初染病时，在嫁接部位形成暗褐色病斑，沿技干向上扩大，严重时幼树桔子死亡。病害若发生在枝干的上部，初为暗褐色、水渍状的不规则或椭圆形病斑，沿技干上下发展逐渐形成略凹陷的带状条斑，病部粗糙，与健 Apple dry rot, also known as rot disease, the general damage after planting poorly managed saplings and feeble old trees. In the first case of infection, dark brown spots formed at the grafting site, expanding upward along the technical level, and the young trees died in serious cases. If the disease occurs in the upper part of the stems, the beginning of the dark brown, water-like irregular or oval lesions, along the technical development of upper and lower development gradually formed a slightly recessed banding, rough, healthy