研究了海南槟榔炭疽病的症状及其病原菌的形态特征、致病性，并分析了病原菌的rDNA－ITS序列。结果表明：从海南槟榔的5个主要栽培区采集的26份病样中均获得了相似的分离物；病原菌分生孢子长卵圆形或圆柱形，大小为（12．0～21．3）μm ×（3．5～6．0）μm，经回接后形成的症状与田间典型症状一致；病原菌在系统进化树上与胶孢炭疽菌处在同一分支，同源性达100％。综合该病原菌的形态特征、致病性和rDNA－ITS区段的分析结果，将海南槟榔炭疽病的病原鉴定为胶孢炭疽菌（ Colletotrichum gloeosporioides）。%The symptoms of arecanut anthracnose in Hainan as well as the morphological characteristics and pathogenicity of pathogen of this disease were studied, and the ribosomal DNA-ITS sequence of this pathogen was analyzed.The results indicated that similar isolates were all obtained from 26 diseased arecanut samples collected from 5 main cultivating regions of Hainan; the conidia of this pathogen were oval or cylindrical, and their size was (12.0~21.3)μm ×(3.5~6.0)μm;after being inoculated, this pathogen caused the same symptoms as the typical symptoms in field diseased samples; the pathogen was in the same branch with Colletotrichum gloeosporioides in phylogenetic tree, and the homology of this two reached 100%.According to the morphological characteristics, pathogenicity and rDNA-ITS sequence of the pathogen of arecanut anthracnose in Hainan, it was identified as Col-letotrichum gloeosporioides.
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