Morphological and physiological variation among isolates of Fusarium oxysporum f. sp. cumini causing wilt of cumin

Ten isolates of Fusarium oxysporum f. sp. cumini were studied for their discernible characters such as the colour of mycelium, pigmentation of substrate, type and amount of mycelia growth, number of sclerotia, virulence and nutritional requirement. All the isolates were found to be pathogenic though they differed in the per cent disease incidence. The isolate BKN was highly virulent as compared to other isolates. The mycelial growth of isolates of Fusarium oxysporum f. sp. cumini on czapek's dox agar basal medium with different carbon and nitrogen sources varied.