Effect of Gene HtN on the Development of Northern Corn Leaf Blight Epidemics. A. D. Raymundo, Former Graduate Research Assistant, Department of Plant Pathology, University of Illinois, Urbana 61801. A. L. Hooker, Professor, and J. M. Perkins, Assistant Plant Pathologist, Department of Plant Pathology, University of Illinois, Urbana 61801. Plant Dis. 65:327-330. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-327.

Corn homozygous for gene HtN, heterozygous for HtN, lacking the allele, or having HtN in combination with gene Ht or with polygenic resistance was inoculated with Helminthosporium turcicum. Incubation time, latent period, percentage infection, and lesion size were measured for all plant genotypes. The effect of the gene HtN was primarily to prolong incubation time and the latent period, thereby delaying the start of epidemics and markedly affecting inoculum production.