论文部分内容阅读
从病原菌的初侵染来源、病菌对银杏离体叶片和实生苗叶片的侵害三个方面研究银杏叶枯病病原菌侵染特性 ,结果表明 :细交链孢菌 (Alternaria tenuis Ness)可在落叶、冬芽、树皮、芽鳞片中越冬 ,以芽鳞片、冬芽、落叶为主 ;炭疽菌 (Colletotrichumsp.)存在于冬芽和芽鳞片中 ;各组织分离都未发现有盘多毛孢菌 (Pestalotia ginkgo Hori)。在人工接种时 ,3种病原菌都只能通过伤口侵染银杏叶片 ;在有伤口的情况下接种 ,病菌在离体叶片上的扩展速度都较实生苗叶片上的快 ,其中细交链孢菌的致病力最强。
The infection characteristics of pathogen of Ginkgo blight were studied from three aspects: the source of primary infection of pathogen and the invasion of ginkgo from the leaves of ginkgo and the leaves of seedling. The results showed that Alternaria tenuis Ness Winter buds, barks and buds were overwintered, with bud scales, winter buds and fallen leaves as main components. Colletotrichum sp. Was found in winter buds and buds. Pestalotia ginkgo Hori was not found in all tissues. . In artificial inoculation, all three kinds of pathogenic bacteria could infect Ginkgo biloba leaves through wounds. When inoculated with wounds, the rate of pathogen expansion on isolated leaves was faster than that on seedling leaves, The most virulent.