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Alternaria helianthi on Sunflower in Ohio. L. J. Herr, Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691. P. E. Lipps, Assistant Professor, Department of Plant Pathology, Ohio State University, Columbus 43210. Plant Dis. 66:509-512. Accepted for publication 12 January 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-509.

A leaf and stem spot disease of oilseed sunflower (Helianthus annuus) caused by Alternaria helianthi was found in Ohio for the first time in 1980. In severely affected fields, many sunflower plants were defoliated and lodged. In greenhouse tests, inoculation with suspensions of 15,000 conidia per milliliter resulted in death of most plants. A. helianthi was seedborne and overwintered in diseased sunflower residues.