| This research aimed at the influence of Xylotrechus rusticus (L) Cytospora chrysosperma(Pers.) Fr. and Erwinia herbicola(Lohms) Dye. on Populus pseudo-simonii X p.nigra wood property. The quality of healthy wood and harmed wood were tested and analyzed,mainly about the following wood properties:anatomical characteristics of wood including fibre length,fibre diameter,fibre length-width ratio,fibre wall thickness,fibre indiameter,fibre wall-indiameter ratio,vessel wall thickness,vessel indiameter,and vessel wall-indiameter ratio,which were measured by computer vision technique;physical feature including density and hardness;chemical properties including the contend of holocellulose,lignin,extraction and other chemical properties. By comprehensive Coordinates and comprehensive mark,the wood quality and characteristics under different influence were evaluated and the preferential order of pulpwood were drawed.The results were of follows:the harm of Xylotrechus rusticus (L) was mainly on fibre length and holocellulose decreased,cell thickness increased,which were all unfavorable to papermaking. For full use the natural resource,the wood harmed by Xylotrechus rusticus (L) could be used to make paper which do not seriously emphasizing on paper intention. Cytospora chrysosperma(Pers.) Fr. and Erwinia herbicola(Lohnis) Dye. had seriously influenced the property of Populus pseudo-simonii Xp.nigra. The fibre length,fibre diameter,fibre length-width ratio,fibre indiameter,vessel indiameter and the content of holocellulose decreased,other features increased. The Cytospora chrysosperma(Pers.) Fr. harmde wood and Erwinia herbicola(Ldhnis) Dye. harmed wood were not fit for papermaking. The preferential order of pulpwood were:the healthy wood,the Xylotrechus rusticus (L) harmed wood,the Cytospora chrysosperma(Pers.) Fr. harmed wood and the Erwinia herbicola(Lohnis) Dye. harmed wood.The results of this research would be good guidance to the utilization of plantation forest of populus.
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