Evaluation of rice genotypes for resistance against false smut

False smut (Ustilaginoidea virens (Cooke) Takahashi) of rice is of serious concern to the rice growers as it affects rice quality and significantly reduces the yield particularly in hybrid rice. One hundred twenty-five genotypes including 18 inbreds from National Hybrid Screening Nursery (NHSN) were evaluated for their resistance/susceptibility to the disease under artificial inoculation conditions. PR 116 was planted as susceptible check.

Cluster analysis of genotypes was done based on different disease variables such as per cent infected panicles, number of smut balls per plant and disease score. Genotypes were grouped into four groups based on average values of disease variables. Nine hybrids and one inbred line were found to be completely free from the disease. However, two inbred lines did not reach flowering stage.