【摘要】 华山松大小蠹共生真菌（ Ｏｐｈｉｏｓｔｏｍａ ｓｐ ．和Ｌｅｐｔｏｇｒａｐｈｉｕ ｍ ｓｐ ．） 是克服寄主华山松树木抗性系统的先导和致死寄主树木的主要原因。华山松大小蠹共生真菌通过对寄主树木木质部树脂道泌脂细胞的分解和菌丝在寄主树木树脂道内的大量繁殖，堵塞寄主树木树脂道，使寄主华山松泌脂系统失去活性和抗性功能。同时，随共生真菌在寄主树木木质部内的发育，菌丝分解寄主木质部薄壁细胞，使寄主树木木质部物质代谢紊乱，导致寄主华山松迅速死亡更多还原

【Abstract】 Symbiotic fungi of \%Dendroctonus armandi \%such as \%Ophiostoma \%sp. and \%Leptographium \%sp. were the precursors to overcome the resistance system of host trees and the main factors to cause the host trees to die. Symbiotic fungi destroyed the bleeding cells and developed in resin ducts, blocking up resin ducts of host trees. At the same time, following the development of symbiotic fungi in inner xylem of host trees, fungi hyphae solved epithelial cells of host trees, which resulted in the disorder of the nutrient and water metabolic of the host and the quick death of host trees.更多还原