A Screening Technique to Evaluate Resistance of Rice to Rhynchosporium oryzae. J. C. Faria, Research Plant Pathologist, Centro Nacional de Pesquisa de Arroz e Feijão. A. S. Prabhu, Research Plant Pathologist, Centro Nacional de Pesquisa de Arroz e Feijão, EMBRAPA, Goiânia, 74000, Brazil. Plant Dis. 64:845-846. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1980. DOI: 10.1094/PD-64-845.

A simple and uniform method for testing rice cultivars for resistance to Rhynchosporium oryzae in a glasshouse was developed. Leaves of 30-day-old plants grown in plastic trays were inoculated with 6- to 7-day-old mycelial disks and incubated under moist conditions for 96 hr. Lesion extension from the point of inoculation was used as a measure of resistance. Susceptibility of test cultivars relative to a standard check cultivar was calculated. Of 40 local and introduced rice cultivars screened, 21 showed relative resistance to one isolate of R. oryzae.

Keyword(s): leaf scald, varietal resistance.