Results of laboratory and greenhouse experiments carried out at ICRISAT Center to study: a) pathogenicity tests and inoculation methods of the fungus Excerohilum turcicum on sorghum, b) effects of temperature and media on growth and sporulation production of E. turcicum, c) infection process of the fungus on leaf blight resistant sorghum cultivar IS 8283 and leaf blight susceptible cultivar Framida, d) susceptibility to leaf blight of sorghum at different growth stages, e) pathogenicity of isolates of the fungus from maize and sorghum collected from different localities on maize and sorghum genotypes were discusse