The wilting of kenaf by Fusarium oxysporum.
Symptoms of wilting and necrosis caused by Fusarium oxysporum f.sp. vasinfectum were observed on kenaf (Hibiscus cannabinus) plants cultivated in southern Italy (Basilicata). The isolates of F. o. f.sp. vasinfectum obtained from kenaf were identified using morphological, cultural and biological characteristics. The pathogenicity of 2 isolates of F. oxysporum from kenaf was tested in greenhouse on 13 host plants and compared with isolates of F. oxysporum from a number of crops: F. o. f.sp. vasinfectum from cotton, F. o. f.sp. melonis from muskmelon and F. o. f.sp. lycopersici from tomato. Results revealed that F. o. f.sp. vasinfectum was the causal agent of the symptoms observed. F. oxysporum from kenaf was similar in pathogenicity to F. o. f.sp. vasinfectum isolated from cotton, and was different from F. o. f.sp. melonis and F. o. f.sp. lycopersici. None of the kenaf genotypes tested were resistant to F. o. f.sp. vasinfectum.