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Inheritance of Virulence in Helminthosporium turcicum to Monogenic Resistant Corn. S. M. Lim, Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana 61801; J. G. Kinsey(2), and A. L. Hooker(3). (2)(3)Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana 61801. Phytopathology 64:1150-1151. DOI: 10.1094/Phyto-64-1150.

The progeny from a cross between isolates of Helminthosporium turcicum avirulent or virulent to monogenic (Ht₁) resistant corn segregated in a 1:1 ratio indicating that virulence in the pathogen is monogenic in inheritance. Corn gene Ht₂ conditioned resistance to both parental isolates. We propose that H. turcicum biotypes avirulent to corn carrying genes Ht₁ and Ht₂ be designated by the virulence formula Ht₁Ht₂/0 (formula number US1) and biotypes avirulent to corn carrying gene Ht₂ but virulent to corn carrying gene Ht₁ be designated by the virulence formula Ht₂/Ht₁ (formula number US2). The Zea mays-H. turcicum host-pathogen system fits the gene-for-gene model.