大果水晶梨是近几年引入我市的优良晚熟砂梨新品种,在栽培中我们发现,该品种如管理不善,易感染黑斑病,常常引起早期落叶,使树势衰弱,继而影响果实品质,造成很大损失。为引起广大果农高度重视,现将黑斑病的危害症状、发病规律及防治方法介绍如下。1危害症状该病主要危害大果水晶 Large fruit crystal pear is introduced into our city in recent years, good late maturing new varieties of sand pear, we found in the cultivation, the species such as poor management, susceptible to black spot disease, often lead to early deciduous, so that the weak potential of trees, and then affect the fruit Quality, causing great losses. In order to arouse the great attention of the majority of fruit growers, the hazard symptom, incidence law and prevention and cure of black spot disease are introduced as follows now. 1 Harmful symptoms The disease is mainly endangering large crystal