苹果进入贮藏期，极易发生病害。现介绍几种主要病害及防治方法。一、斑点病该病采收后至贮藏初期均有发生。其症状是：果面上发生黑褐色小圆斑，稍下沉，边缘清晰，病斑不深入果肉，仅表皮下细胞变色。后期病斑易被杂菌侵染，造成果实腐烂。一般果树早期落叶缺磷，采收较早， Apple into the storage period, prone to disease. Now introduce several main diseases and prevention methods. First, the spot disease after the disease recovery to storage have occurred. The symptoms are: dark brown spot on the surface of the fruit, a little sink, the edge clear, the lesion is not deep into the pulp, only the subepidermal cells discoloration. Later lesions easily infected by bacteria, causing fruit decay. Early fruit trees generally phosphorus deficiency, harvest earlier,