First report of fusarium crown and root rot of tomato caused by Fusarium oxysporum f.sp. radicis-lycopersici in Turkey.
During the 1999-2001 growing seasons, the site of the first finding in Adana and five other polytunnels in the province of Icel, Turkey, were examined. Macroconidia from the stem surfaces of 48 tomato plants exhibiting symptoms were spread on potato dextrose agar and single germinating conidia were isolated. These monoconidial isolates of F. oxysporum were subjected to the vegetative compatibility grouping (VCG) test. Nine isolates were compatible with the testers of VCG 0090/subgroup II and two with the testers of VCG 0091/subgroup I. The remaining 37 isolates were self-compatible and did not belong to any of the VCGs tested. No conclusion can be drawn regarding the exact origin of the disease in Turkey. Upon conducting pathogenicity tests, F. oxysporum was reisolated from the infected plants. This is the first report of F. oxysporum f.sp. radicis-lycopersici in Turkey.