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近年来,河北省张家口坝上地区,随着林业生产的发展,造林面积增大,病害也随之增多而严重;特别是杨树腐烂病,给生产造成了很大损失。为了保证生产任务的完成,防治杨树腐烂病就成为急待解决的重要问题。1965年我们在河北省张家口坝上地区,进行了杨树腐烂病的防治工作,现将结果报道如下:一、病害的一般情况和抗病品种的调查此病在河北省张家口坝上地区分布广,危害较严重。在张北、康保、沽元、尚义及商都等县,均有发生。康保机械林场1965年发病率为22%,死亡率为
In recent years, along the development of forestry production in the dam area of Zhangjiakou, Hebei Province, the area of afforestation has increased and diseases have also increased and become serious. In particular, poplar rot disease has caused great losses to production. In order to ensure the completion of production tasks, prevention and treatment of poplar rot disease has become an urgent issue to be solved. In 1965 we Zhangjiakou Bashang area in Hebei Province, carried out prevention and treatment of poplar rot disease, the results reported below: First, the general situation of disease and disease-resistant varieties of the disease in Zhangjiakou, Hebei Province, the area is widely distributed , More serious harm. In Zhangbei, Kangbao, Guyuan, Shangyi and Shangdu counties, have occurred. Kangbao Machinery forest farm incidence in 1965 was 22%, the mortality rate was