Abstract
Sheath rot disease, incited by the fungus Sarocladium oryzae, has become increasingly prevalent on high-yielding rice cultivars in Tamil Nadu. Sheath rot is particularly destructive in association with large populations of the rice mealy bug. A method of assessment of the resistance of rice genotypes to sheath rot is described, based on the apparent synergistic relationship between S. oryzae and the rice mealy bug, using mealy bug infested with the pathogen for inoculation. The efficacy and accuracy of this method were compared with standard screening methods. Inoculation of rice flag leaf sheaths with S. oryzae via mealy bug crawlers consistently produced severe infection with few escapes and a short incubation period. This technique should prove useful as a method for screening for sheath rot resistance in the presence of mealy bug damage.
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