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Further Physiologic Specialization in Helminthosporium turcicum. D. R. Smith, Plant Pathologist, DEKALB AgResearch, Inc., DeKalb, IL 60115. J. G. Kinsey, Plant Pathologist, DEKALB AgResearch, Inc., DeKalb, IL 60115. Plant Dis. 64:779-781. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-779.

A previously undescribed race of Helminthosporium turcicum is virulent to corn plants containing either gene Ht2 or Ht3. This race is designated H. turcicum race 3 with the virulence formula Ht1/ Ht2Ht3.

Keyword(s): corn pathogen monitoring project, gene Ht, physiologic races.