你的梨园黑星病泛滥成灾的原因主要是管理粗放、树势衰弱，因此首先应加强管理、增施有机肥、合理修剪，以养壮树势，在药剂防治上提出以下两点供参考．（1）发芽前喷布40％福美脚可湿性粉剂80～100倍，作为铲除剂；（2）花后根据降雨情况每隔15～20天喷杀菌剂二次，以保护花序 The reason why your pear scab is rampant is that the management is extensive and the shrubs weak. Therefore, we should first strengthen the management, increase the organic manure, and pruned the tree vigorously so as to raise the following points for the prevention and control of pesticides. . (1) before germination 40% of the United States and the United States Foot WP 80 to 100 times as a shovel; (2) after the flowering every 15 to 20 days after the spray fungicide secondary to protect the inflorescence