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一、发病症状:初期树干皮孔边缘形成灰色隆起水泡,小泡成圆形,直径约1毫米,破裂后流出褐色液体,下面形成新皮恢复健康。如小泡不断扩展,连成不规则状大泡,破裂后将留下褐色伤疤,皮层腐烂。发病严重,树干一周布满伤疤,植株死亡。二、发病规律:该病发病初期为4月上旬,高峰期为5月中旬至6月上旬,7月至8月病势减轻,9月份又有发展,10月份停止发病。通过对郑庄子乡李各庄村30亩中林46杨造林地此病发生情况调查发现,及时灌水及管理对此病发生有重要影响。北部经及时
First, the incidence of symptoms: the beginning of the trunk lenticel to form a gray bulge blisters, vesicles into a round, about 1 mm in diameter, after the burst out of the brown liquid, the formation of a new skin below to restore health. Such as vesicles continue to expand, even into irregular bubble, rupture will leave brown scars, cortex decay. Seriously ill, the trunk covered with scars a week, the plant died. Second, the incidence of the law: the disease early onset in early April, the peak from mid-May to early June, July to August reduce the disease, in September there are developments in October to stop the disease. A survey on the occurrence of the disease in the afforestation site of 30 mu in Ligezhuang Village, Zheng Zhuangzi Township, found that timely irrigation and management have an important impact on the occurrence of the disease. North by the time