A rota/ of 90 rice genotypes in 2001 and 157 in 2002 of different genetic background were
evaluated for resistance to sheath blight caused by Rhizoctonia so/ani at National Rice
Research Program, Hardinath. In 2001, out of90 genotypes 5 were moderately resistant, 36
moderately susceptible and 49 susceptible. The disease severity was very high in 2002 in
comparison to that in 2001. Out of 157genotypes, 5 showed moderately susceptible, 101
susceptible and 51 highly susceptible. BR 268-4-6-1-4-3-3-5-2, NR 1743-1-2-4-2-2, NR
1743-13-1-1-1-3-4-1-2-2-1-3, NR 1748-12-1-1-4-3-4-3-2-4-1 and NR 1558-69-1-1-1-1-2-2-
1-3-1 scored moderately resistant reaction to the disease in 2001. However, none of the
tested genotypes showed resistant to the disease in both years. This indicated that integrated
disease management approach is needed to develop than varietal resistance alone.

A rota/ of 90 rice genotypes in 2001 and 157 in 2002 of different genetic background were
evaluated for resistance to sheath blight caused by Rhizoctonia so/ani at National Rice
Research Program, Hardinath. In 2001, out of90 genotypes 5 were moderately resistant, 36
moderately susceptible and 49 susceptible. The disease severity was very high in 2002 in
comparison to that in 2001. Out of 157genotypes, 5 showed moderately susceptible, 101
susceptible and 51 highly susceptible. BR 268-4-6-1-4-3-3-5-2, NR 1743-1-2-4-2-2, NR
1743-13-1-1-1-3-4-1-2-2-1-3, NR 1748-12-1-1-4-3-4-3-2-4-1 and NR 1558-69-1-1-1-1-2-2-
1-3-1 scored moderately resistant reaction to the disease in 2001. However, none of the
tested genotypes showed resistant to the disease in both years. This indicated that integrated
disease management approach is needed to develop than varietal resistance alone.