An extensive survey was conducted during in major rice growing areas of
Bihar for collection of diseased samples of paddy (
leaf as well as seed) to study morphological variability
amongst the isolates of Brown spot fungus,
Bipolaris oryzae. These samples from 25 districts
were used for isolation of desired pathogen from spotted
leaf and seeds with infection of brown spot disease.
The disease was prevalent at all the locations
surveyed and not even a single plant could be seen
without brown spot symptoms in all the areas sur-
Research Paper E-ISSN : 2454-9916 | Volume : 1 | Issue : 5 | Dec 2015
veyed. Amongst them the isolates from Samastipur,
West Champaran, Aurangabad, Navada and Katihar
which are geographically distantly located and with
maximum disease incidence were selected for carrying
out variability studies.