Abstract
The variability in cultural characteristics and the virulence among three isolates of Fusarium oxysporum f. sp. ciceri causing vascular wilt in chickpea was studied under laboratory conditions. The three isolates (Foc-1, Foc-2 and Foc-3) did not show any significant difference in their mycelial dry weight production at any temperature regimes, pH level or the growth media tested. The radial growth on PDA also did not differ significantly in the three isolates. However, some quantitative differences were noted in colony characters and septations in macroconidia of these isolates. The isolate Foc-1 exhibited dull white, thin and flat hairy growth, spreading out like thread, Foc-2 showed a white fluffy colony with irregular aerial margin, while Foc-3 exhibited a pinkish white, slightly fluffy colony with regular margin. Conidia also differed with regard to septation. Three to six septa were present in Foc-2, while there were 2–3 in isolates Foc-1 and Foc-2. These isolates differed significantly with regard to their virulence on test varieties. Isolate Foc-1 was more virulent that Foc-2 or Foc-3 and produced abundant spores.
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