Screening of fungi implicated in the dieback of olive trees (Olea europea) in Chebika’s area

Several surveys were conducted during spring 2008 in Chebika’s area in Tunisia.Samples were collected from infected plants showed different types of symptoms andthey have been the subject of mycological analysis. The morphological identification offungal colonies isolated from roots, crown and stems of two olive varieties Koroneiki andChemlali Sfax, revealed the presence of a fungi complex including Fusarium oxysporum,Fusarium solani, Rhizoctonia solani, Verticillium dahliae, Cladosporium fulvum,Alternaria solani, Alternaria tenuis, Bispora punctata. and Cylindrocarpon.sp; Although,those fungi Fusarium oxysporum, Fusarium solani, Rhizoctonia solani and Verticilliumdahliae are ubiquitous and the predominant one. Pathogenicity results revealed that thefungi isolated from olive trees exhibited typical symptoms on Koroneiki variety incontrolled conditions.