Abstract:

The experimental stands of geographical provenance of Pinus tabulaeformis in Benxi and Liaoyang, Liaoning province, are in the areas where Matsu coccus matsumurae kuwana has occured. The study on the difference in resistance to Matsucoccus matsumurae kuwana is one part of the Pinus tabulaeformis provenance experiments. The amount of the Matsuscoccus matsumurae Kuwana nymphae occured in the 8 - year - old stands have been observed. The injury grade of trees have been classified one by one according to fourclass standard in the 10 - year - old stands. The results show that there is a significant difference in resistance to Matsucoccus matsumurae Kuwana between provenances. The 8 fine provenances arc selected based on the integrative evaluation of their adaptability, growth increment and resistance to Matsucoccus matsumurae, which are from Zunhua Huangling, Ningcheng, Chengde, Taishan, Qianxi, Huanglong, and Suizhong. The average rate of resistant tree is over 93% (86%- 100%). which is higher 1 8 percent than that of ordinary Pinus tabulaeformis stand Among ecotypes, the west - middle and east type are the best the orders are as follows: west - middle > east > northeast > middle > southwest > south > northwest the 3 latter ecotypes are unusable.

Key words: Pinus tabulaeformis, Matsucoccus matsumurae Kuwana, Elite provenance, Ecotype, Geographical variation, Resistant tree, Receptive tree, Hereditary gene