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河南省已栽植泡桐4亿株,由于缺少检疫和防治措施,使丛枝病日趋严重。据调查,4—6年生泡桐,病株率达70％以上,全省因丛枝病危害,每年少生长相木约23万立方米,损失约三千余万元。当前防治泡桐丛枝病多采取修除病枝和选用无病种根等措施,尚难控制丛枝病的蔓延。为了寻求有效的药疗措施,1983—1986年,用研制
Henan Province has planted 400 million Paulownia, due to the lack of quarantine and control measures, so that the bush disease worsening. According to the survey, 4 to 6 years old Paulownia, diseased plants rate of 70% or more, the province due to the bristle disease hazards, less annual growth of about 230,000 cubic meters, the loss of about thirty million yuan. At present, the prevention and treatment of Paulownia witches birch disease to take more than the removal of diseased branches and selection of disease-free seedling and other measures, it is difficult to control the spread of brooms. In order to seek effective medical treatment measures, 1983-1986, with the development