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Letter to the Editor: Nomenclature of Races of Puccinia helianthi and Designation of Genes for Rust Resistance in Sunflowers. W. E. Sackston, emeritus professor of plant pathology, Department of Plant Science, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec, Canada, H9X 1C0, and N. V. Rama R. Urs, plant pathologist, Dahlgren and Co., 1220 Sunflower St., Crookston, MN 56716. Phytopathology 79:1232.