Zonate Eyespot on Wild Rice Caused by Drechslera gigantea. M. K. Kardin, Graduate Student, Department of Plant Pathology, University of Minnesota, St. Paul 55108. R. L. Bowden, Former Graduate Student, J. A. Percich, Assistant Professor, and L. J. Nickelson, Former Research Fellow, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 66:737-739. Accepted for publication 26 February 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-737.

Drechslera gigantea was identified as the causal agent of zonate eyespot of wild rice (Zizania aquatica) in Minnesota. The disease was observed in four growers’ fields, two University of Minnesota Experiment Station fields, and two natural stands. In greenhouse tests, wild rice cultivars Netum, K-2, and Johnson were susceptible to D. gigantea. Host range studies indicated that smooth brome (Bromus inermis), quackgrass (Agropyron repens), and reed canarygrass (Phalaris arundinacea) can serve as alternate hosts of D. gigantea.

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