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Comparative Studies on Resistance of Populus deltoides Bartr.cv. 'Lux' ex.1-69/55and P. xdakuanensis Hsu.to Anoplophora glabripennis

Wang Ruiqin Li Fenglan Huang Yiping Zhou Zhangyi(Beijing Forestry University)  
Different levels of resistance can be observed in various poplar varieties to Anoplophora glabripennis.The anatomical structure,the nutritive situation arid some chemical constituents in poplar have been investigated and compared to the strongly resistant poplar 69 variety and highly sensitive poplar Daguan variety.The test of feeding the larvae of Anoplophora glabripennis has been done.Experimental results indicated that the strong resistance mechanism of poplar 69 is due to the increase of stone cells in the bark,the close arrangement of fibers,the indiscriminate nature of cell walls in wood,and the production of the large quantity of cellulose.The lignin and ash content,and the decline in the quantity of nutritive constituents are the main factors relative to the strong resistance of this species.
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