杨树生长快,木材增产幅度大,栽培范围广,是营造用材林,防护林和城乡绿化的重要树种。杨树良种的选育历史较长,成效也比较显著,但以往的良种选育多着重于树木的生长量指标,对树木的抗病虫特性注意不够,特别是对树木的抗虫性研究更少。 近年来,由于杨树病虫害日益严重,致使大面积杨树人工林遭到破坏,尽管采取了物理、化学生物等多种防治措施,起到一些减缓作用,但效果仍然很不理想,许多主要病虫害仍 Poplar grow fast, timber yield increase, a wide range of cultivation, is to create timber, shelterbelt and urban and rural afforestation important species. Breeding of poplar seed has a long history and relatively good results. However, previous seed breeding focused more on the growth index of trees, not enough attention on the pest-resistance characteristics of trees, especially on the study of tree pest resistance less. In recent years, poplar plantations have been devastated by the growing severity of poplar diseases and insect pests. Despite the various physical and chemical biological control measures that have taken some mitigation effects, the effect is still far from satisfactory. Many major pests and diseases still