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杨树病害症状及防治
杨树若染上黑斑病,冬季清除枯枝烂叶,发病后喷施45%代森锌、70%甲基托布津200倍液。若染上了叶锈病,应选择抗病品种,用三唑酮、戊唑醇等化学药剂喷施。若染上溃疡病,需加强管理,用70%甲基托布津200倍液喷雾。若染上烂皮病,需刮除病斑,喷施福美砷、五氯酚钠等药剂。 一、黑斑病 ...
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