Abstract:  To clarify the cause of castor bean bud rot, pathogenic strains were isolated by tissue isolation and tested for pathogenicity. Classification status of the pathogens were determined by ITS-PCR combined with morpho⁃ logical identification. Results showed that RFR1-4 isolated from the disease samples, was confirmed to be the pathogen according to Koch's rule. It was identified as Fusarium solani by morphological characteristics. By ITS analysis, EF1-α and β-tubulin sequences revealed a 100% identity with F. solani species complex by polyphasic identification of FUSARIUM-ID database. Therefor, the pathogenic strain (RFR1-4) was identified to be a member of F. solani species complex which caused castor bean bud rot. Key words: castor；bean bud rot；Fusarium solani species complex 蓖麻（Ricinus communis L.

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