Abstract: Diseased roots of root rot were selected and pathogen of Cucuminum cyminum L., Fusarium oxysporum, Fusarium solani(mart.) Sacc., Rhizoctonia sp. and a kind of unknown pathogen belonged to Deuteromycotina were isolated and identified. After the wound inoculation, the incidence of root rot diseases of a kind of unknown pathogen, which belonged to Deuteromycotina, showed a higher value of 70.0%, F. oxysporum, F. solani and Rhizoctonia were 50.9%, 43.2%and 11.0%, respectively. The incidence of root rot diseases of its mixture inoculation was 97.4%. The test of isolation and identification of the pathogen and pathogenecity showed that the root rot of Cucuminum cyminum L. was caused by a complex infection of F. oxysporum, F. solani, Rhizoctonia and a kind of unknown pathogen belonged to Deuteromycotina．

Key words: Cucuminum cyminum L. root rot, Fusarium oxysporum Schlecht, Fusarium solani(mart.)Sacc., Rhizoctonia sp．