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1972年至1973年,我们在张家口坝上地区对杨树腐烂病进行了调查和防治试验工作,现将情况和试验结果,整理如下: 一、分布及为害 杨树腐烂病发生在东北、华北、内蒙、青海、新疆等省(区)。我省在坝上地区发生普遍。主要为害小叶杨、青杨、唐柳、加杨、河柳等枝干皮部。轻者影响林木生长,重者造成大面积死亡。如张北县中心林场、沽源县平定堡林场天合永林区、尚义县北石楞林场,林内发病率一般在10—30％,严重的达60％以上。1972年天合永林区,发生面积八十多亩,伐除
From 1972 to 1973, we conducted a survey and prevention and control work on poplar rot in the dam area of Zhangjiakou. The situation and test results are summarized as follows: I. Distribution and Harmness Poplar rot disease occurs in the northeast, north China, Inner Mongolia, Qinghai, Xinjiang and other provinces (regions). My province occurs generally in Bashang area. The main damage Populus, Poplar, Tang Liu, plus Yang, river willow and other branches of the Ministry of dry skin. Light affect the growth of trees, severe cases caused a large area of death. For example, Zhangbei County Center Forest Farm, Pingyuanbao Forest Farm in Guyuan County, Yonghe District, and the Forest of Stone Forest in Shangyi County have a prevalence of 10-30% in the forest and more than 60% in serious cases. 1972 Yonghe District, Tianhe, occurred more than 80 acres of area, removed