Effect of Culture Media on Growth and Pigmentation of Fusarium oxysporum f. sp. udum Butler Isolated from Different Varieties of Pigeon Pea [Cajanus cajan (L.) Millsp.]

The present study was undertaken to find out the suitability of culture media for the study of cultural variability among seven isolates of Fusarium oxysporum f. sp. udum isolated from seven different varieties of pigeon pea [Cajanus cajan (L.) Millsp.] using Czapek’s dox agar (CDA), potato dextrose agar (PDA) and glucose nitrate agar (GNA). The growth rate and growth pattern of F. oxysporum f. sp. udum isolates were different on three types of media. Mycelial colour of the pathogen and substrate colour also different on different media. The pathogen isolates showed variability in pigmentation more on CDA as compared with other and the growth rate of the pathogen isolates per day were high in case of GNA was observed. The colonies grown on CDA and GNA were showed maximum fluffy growth; on PDA it was appressed manner.