近年来,梨黑斑病成为我县梨树的主要病害之一。该病可造成叶片及果实早期脱落,树势衰弱,商品率下降。笔者经过几年的调查和试验,总结出了一套行之有效的防治方法,现介绍如下。一、症状叶片受害:叶片发病初期为米粒大小的黑色斑点,扩大后为黑色圆形病斑,病斑内外及正反两面颜色 In recent years, pear spot has become one of the major diseases of pear tree in our county. The disease can cause the leaves and fruits early fall off, tree weakness, the decline in commodity rate. After several years of investigation and experimentation, the author summed up a set of effective prevention and control methods, are presented below. First, the symptoms of leaf damage: the early onset of leaves for the size of black rice spots, expanded to a black circular lesions, both inside and outside the lesion color and both sides