叶片发病时,发病多从叶缘开始,病斑为褐色,扩展至全叶时很象霜害,易脱落。 新梢发病,产生圆长形褐色凹陷溃疡斑,病斑初期常流胶,溃疡扩展包围枝条后,病枝上部枯死。 二、发病条件。 开花期天气湿冷,容易形成花腐;果实成熟期温暖,多雨露或高湿环境对病菌繁殖与侵染有利,果腐严重。此 The incidence of leaves, the incidence began from the leaf margin, the lesion is brown, extended to the whole leaf is like frost damage, easy to fall off. Emergence of shoots, resulting in oblong brown depression ulcer plaque, lesion initial flow gel, ulcers extend the surrounding branches, the upper branch of the disease withered. Second, the incidence of conditions. Wet and dry flowering, easy to form flower rot; fruit mature warm, rainy or humid environment beneficial bacteria propagation and infection, fruit rot serious. this