5. Results
It was found that the disease was prevalent in all the
places surveyed. The disease incidence percentage
varied from 15.30 to 52.10. Maximum disease incidence
(52.10%) was recorded from Samastipur
6. Discussion
cidence of brown spot of paddy and 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. 52 isolates of
Bipolaris oryze from rice were characterized morphologically. On the basis of colony morphology and growth pattern on PDA, these all
isolates can be grouped into 5 categories