Studies on cultural and morphological variation among 20 isolates of fusarium oxysporum causing wilt of tomato

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Author: 
Padmaja M. Chougule and Yogesh S. Andoji
Abstract: 

Twenty isolates of Fusarium oxysporum causing wilt of tomato were recorded for its cultural and morphological variations. The Fusarium oxysporum isolates Fs4 , Fs8 , Fs 11 , Fs12 , Fs14 , Fs15 , Fs16 , Fs17 , Fs19 , Fs20 having the radial colony growth between diameter of 86 mm to 90 mm were among the fast growing category whereas isolates Fs1 , Fs3 , Fs10 , Fs13 , Fs18 showed colony growth between 64 mm to 80 mm classified as medium growing and bellow 64 mm growth of isolates were recorded as slow growing. The biggest size macro-conidia were obtained in isolates Fs 18 ( 31 – 33 × 5 – 6 µm) whereas, the smallest size were obtained from isolate Fs6 ( 12 – 14 × 3 – 4 µm ). The biggest size micro-conidia were obtained in isolate Fs18 ( 8 – 11 × 1 – 3 µm ) whereas, the smallest size were obtained from isolates Fs5 and Fs6 ( 3 – 4 × 1 – 2 µm ). The number of septa in macro and micro-conidia were3-4 and 0-1 respectively all conidia showed hyline nature. The Macro-conidia were sickle shaped with blunt ends and micro-conidia were round to oval. Chlamydospores were recorded from all 11 days culture of F. oxysporum . The highest dry mycelium weight was obtained from the isolate Fs13 having weight 188.0 mg and minimum dry mycelium weight 133.0 mg was obtained from the isolate Fs8.

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