1981～1990年作者对70年代选育出定植在不同地区的杨树新品种试验林中的各优系的抗病虫性进行了观察试验。研究结果表明,中林46等12个新无性系对多种林木病虫害有较强的抗性,特别对杨树溃疡病有高度的抗性。通过研究,确定了适合在暖温带、温带和江淮亚热带地区发展和推广的抗病虫品种。 From 1981 to 1990, the authors observed and tested the pest and disease resistance of each excellent line in the poplar new variety test forest planted in different regions in the 1970s. The results showed that 12 new clones such as Zhonglin 46 had strong resistance to various forest pests and diseases, especially to poplar canker disease. Through the research, we identified the resistant pest species suitable for development and popularization in the warm temperate zone, temperate zone and sub-tropical Jianghuai area.