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The pathogen Bipolaris oryzae was subjected to different cultural conditions viz., media, temperature, pH, light and nutrient source under in vitro conditions. The maximum radial growth of 84.83 mm was recorded on paddy leaf extract agar followed by potato dextrose agar (61.33 mm). On this medium, the colony appeared greyish-white to dark brown, thick, leathery slightly raised and profuse mycelia with brown colored conidia. | Effect of media temperature light pH and nutrient source on growth and development of bipolaris oryzae causing brown leaf spot of paddy