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60年代以来,新疆、内蒙、河南等地的白榆人工林和次生林陆续出现成群或成片死亡。1982—1985年,作者曾先后对其死亡情况进行了大量调查,并对病榆木质部变色条纹和危害榆树的小蠹虫做了分离培养和接种试验。从榆木枯萎症状,病菌形态及接种后无死亡现象的结果表明,均与世界流行的荷兰榆病无相似之处。初步认为齐腹小蠹是导致榆树死亡的直接原因,而干旱为小蠹虫的滋生创造了有利条件。
Since the 1960s, elm forests and secondary forests of Ulmus pumila in Xinjiang, Inner Mongolia and Henan have witnessed deaths in groups or in succession. From 1982 to 1985, the author conducted numerous investigations into the deaths of the elm trees, and carried out isolation culture and inoculation tests on the discoloration streaks of elm trees and the bark beetles that endanger the elm trees. From the symptom of elm wilt, the morphology of the pathogen and the phenomenon of no death after inoculation, it showed that there were no similarities with the elm disease in the world. It is initially believed that Bydia pomonella is the direct cause of the death of the elm, and the drought has created favorable conditions for the growth of the bark beetle.