Reactions of Eighty-Four Sources of Chlorotic Lesion Resistance in Corn to Three Biotypes of Helminthosporium turcicum. J. M. Perkins, Assistant Plant Pathologist, Department of Plant Pathology, University of Illinois, Urbana 61801. A. L. Hooker, formerly Professor of Plant Pathology and Plant Genetics, Departments of Plant Pathology and Agronomy, University of Illinois, Urbana 61801. Plant Dis. 65:502-504. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-502.

Eighty-four sources of chlorotic lesion resistance were evaluated in the seedling stage for reaction to three biotypes of Helminthosporium turcicum. Resistance was found to race 1 in 76 sources, to the race 2 biotype from Brook, IN, in 36 sources, and to race 3 in 82 sources. The degree of resistance expression differed.

Keyword(s): gene Ht, gene Ht2, gene Ht3, gene HtN, northern corn leaf blight, physiologic races.