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一、杨树溃疡病1发病规律主要发生于苗木移植过程中,3月下旬开始发病,4月中旬至5月下旬为发病高峰期,6月初基本停止,10月后稍有发展。该病可侵染树干、根茎和大树枝条,但主要危害树干的中部和下部。发病初期树干皮孔附近出现水泡,水泡破裂后流出带臭味的液体,内有大量病菌。病部最后干缩下陷成溃疡斑,病斑处皮层变褐腐烂,当病斑横
First, the incidence of poplar canker disease 1 occurs mainly in seedling transplantation process, the onset of disease in late March, mid-April to late May for the onset of the peak, basically stopped in early June, after a slight development in October. The disease infects tree trunks, rhizomes and boughs, but harms the middle and lower parts of the tree trunk. Early blisters appear near the trunk of the trunk blisters, blisters rupture out of the smell of liquid, there are a large number of bacteria. Diseases finally shrink shrink into ulcer spots, lesions at the cortex brown rot, when the lesion horizontal