Evaluation of Suitable Culture Media for Growth of Rhizoctonia bataticola Causing Dry Root Rot of Soybean (Glycine max L.)

Rhizoctonia bataticola (Tabb.) Butler is one of the major constraints in profitable production of soybean, causing heavy quantitative and qualitative losses. This research was conducted at Department of Plant Pathology, College of Agriculture, Ummedganj, Kota. In this research, dry root rot affected samples were collected from different farms of Kota. Among the seven-culture media used for study, the maximum colony diameter 88.00 mm was recorded on potato dextrose agar 96 hrs. after inoculation which was statistically significant over rest of medium tested. This indicates that maximum growth of R. bataticola, was supported by potato dextrose agar medium. The next was Czapek Dox agar medium which yielded 83.00 mm colony diameter followed by oat meal agar medium (78.00 mm), soybean root extract agar (51.00 mm) V-8 juice agar (42.00 mm) and soybean leaf extract agar 36.33 mm radial growth of fungus. Least colony diameter (26.67 mm) of the pathogen was observed in soybean stem extract agar medium and it was statistically inferior than all other agar medium tried.