关键词: 新疆杨, 北抗杨, 光肩星天牛, 发育抗性, 抗虫性

Abstract: [Objective] In this study, the resistant difference between Populus deltoides cl. Beikang(PDB) and Populus alba var. pyramidalis (PAP) against Anoplophora glabripennis (ALB) in northwest China was investigated to provide reference for selecting resistant popular varieties plating in Arid and semi-Arid regions of Northwestern China.[Method] Six preferred clones of PDB (16-4, 16-8, 16-17, 16-18, 16-22, 16-27) were provided by Prof. Han Yifan research group of the Forestry Research Institute, Chinese Academy of Forestry in 1999. From 2003 to 2011, 18 poplar varieties, including 6 PDB asexual lines as well as PAP, were selected to screen multi species and pure forest resistance test that was conducted in experimental plots in Dengkou County, Inner Mongolia, and 104 individuals of the clones in an area of 2.72 hm² were observed in a pure forest resistance experimental plots. In 2013, 1 000 PDB trees were planted, with PAP served as the control, to carry out expanded experiments in the epidemic area of the Linhe District, Dengkou County, and Hangjinhou County. The differences of the oviposition, egg hatching, larval feeding and development of ALB in PAP and PDB were dissected to analyze the spawning and emergence of ALB in the epidemic area, and to analyze the difference in the insect's evolution trend in PAP and PDB.[Result] It was showed that PAP bark had strong selective resistance to ALB adult oviposition. The ALB larvae seldom fed the phloem of PAP, and mainly depended on feeding xylem to complete their development. Therefore, PAP bark was damaged slightly, while PAP xylem was seriously affected with the ALB adult emergence rate 25.8%. PDB bark had weaker resistance to ALB adult oviposition selection. ALB larvae fed the cambium and phloem of PDB, resulting in the palm like depression of the bark and the spawning grooves healed to form a larger scar. The damage to the bark appearance was serious; however, the PDB cambium, phloem, and xylem showed a strong resistance to the development of each larval stage and to the emergence and emergence of the adults, and the emergence rate was only 0.25%.[Conclusion] PAP had a strong resistance to ALB attacking, but its developmental resistance was weak; without human intervention, the pest density in pure forest increased progressively; its resistance did not last long; the damages occurred after many years with dense ALB galleries and thus the wood value was reduced significantly. Comparatively PDB's resistance to the damages of ALB was weak, but the developmental resistance was strong; and its resistance to damages of ALB in the pure forest was showed persistently and steadily with few galleries in xylem. Thus the different clones of PDB could be selected according to needs of gender, trunk, and speed nature to improve afforestation resistance. Such as in a quick greening as the goal, 16-27 clones (PDB 1, male) could be selected as the fastest growing; being its good trunk shape and tall, and 16-4 clones (female) could be selected with the highest growth as farmland shelter; 16-8 clones (male) could be selected with good trunk shape and without catkins pollution.

Key words: Populus alba var. pyramidalis, Populus deltoides cl. Beikang, Asian longhorned beetle, development resistance, insect resistance