<正>1986年9月至1989年6月间,在江苏各地采集大量病叶,进行组织分离、接种试验。结果表明,该病的病原菌有Alternaria sp., Colletotrichum sP.和Pestalotia sp.3种。根据它们的致病性以及出现的时期、数量等差异,初步认为A.sP.菌是该病的主要病原菌;次为Co.sp.

Studies were carried out from September, 1986 to June, 1989 to collect a large amount of diseased leaves, in order to find out the causal organisms of Ginkgo leaf blight. Among collections of diseased leaves from all parts of Jiangsu, 3 fungi were identified by means of tissue isolation and inoculation tests as the causal organisms of the disease. They were Alternaria sp., Colletotrichum sp. and Pestalotia sp. On the basis of the differences between their pathogcnicity, the quantity and time of occurrence, we preliminarily considered that, Alternaria sp. was the first important pathogen and then Colletotrichum sp. and Pestalotia sp. respectively.