摘要
1989～1992年间,以银杏的冬芽、幼叶、嫩叶以及越冬后的落叶等为试验材料进行研究。结果表明,银杏叶枯病的三种病菌(Alternaria alternata;Colletotrichum gloeosporioides;Pestalotia ginkgo)均能在冬芽和落叶上越冬。当春季芽萌发后,银杏叶枯病的主要病原链格孢菌(A.alternata)能转移到部分嫩叶上,继续进行潜伏侵染,但其数量显著下降。3～6月间,越冬后落叶上的链格孢菌可以大量形成呈丛状的分生孢子梗,并不断产生新的分生孢子。上一年在落叶上产生的分生孢子,越冬后仍具有一定的发芽率。就病害的侵染源而言,带菌的落叶较带菌的冬芽,应更为重要。
The experiment was carried out in the period from 1989 to 1992. The author took the winter buds, Young leaves,tender leaves,tender leaves and overwintering fallen leaves of Oinkgo as experimental materials. The results demonstrated that all the three pathogens (Alternaria alternata, Col-letotrichum gloeosporioides, Pestalotia ginkgo) of ginkgo leaf blight overwintered on winter buds and fallen leaves in the form of mycelium. During the spring (after the germination of buds), the main pathogen-A. alternata of ginkgo leaf blight could be transferred to a part of tender leaves and continued its incubating infection, But there was a marked drop in quantity. During the months of March to June, clumped conidiophores were formed by A. alternata on the overwintering fallen leaves, and new conidiodpores constantly emerged. The conidiospores formed on the fallen leaves last year still retained the germination capacity to a certain degree. So far as the carriers were concerned, the winter buds could not be compared with fallen leavs in the sense of infectious source.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
1993年第4期53-56,共4页
Journal of Nanjing Forestry University：Natural Sciences Edition
关键词
银杏
叶枯病
初侵染源
链格孢菌
Leaf blight of ginkgo
Primary source of infection
Alternaria alternata
Colletotrichum gloeosporioides
Pestalotia qinkgo
