梨黑星病是梨的一种最重要的病害。除危害梢、叶外,还加害果实和嫩芽。常引起落叶,造成树势衰弱,产量和品质大幅度下降。梨黑星病的病原菌,以菌丝在发病的枝梢芽内和枝条上越冬。梨芽萌动时,病菌开始活动.到芽鳞开绽时,就会在嫩芽或花朵上危害。黑星病在春季发病的早晚和程度,与冬、春的雨雪多少有密切关系。一般冬、春雨雪多,湿度大的年份,发病就会早而 Pear scab is one of the most important diseases of pear. In addition to endanger the leaves, leaves, but also harm fruit and shoots. Often caused by deciduous, resulting in frailty, yield and quality dropped significantly. Pear scytacae pathogens to mycelial shoots in the shoots and branches overwintering. Sprouting buds, the bacteria began to move to the bud scales open, it will endanger the buds or flowers. Scab in the onset of spring sooner or later, and the degree of winter and spring rain and snow are closely related. General winter, snow and more spring, the humidity of the year, the incidence will be early