1. Rationale, Problems
Rice is the staple
food for more than half of world's population. However
over 90 percent of the rice in the world is produced
and consumed in Asian countries. Rice is
known to be attacked by many diseases and some of
them are seed borne. Brown leaf spot of rice caused by
Drechslera oryzae (Breda de Haan) (Subram. and
Jain) is one of the major fungal disease of rice which
occurs in almost all the rice growing areas of the country
2. Concept, Idea, Innovation
study can be used by plant breeders for screening varieties in pipeline against Brown spot disease which is the most threatening disease
3. Objectives
An extensive survey was conducted during in major rice growing areas of
Bihar for collection of diseased samples of paddy
to study morphological variability
amongst the isolates of Brown spot fungus,
Bipolaris oryzae
4. Methodology
An extensive survey was conducted during kharif season
of 2012 and 2013 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.
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