Comparison of Fungal Brown Spot Severity to Incidence of Seedborne Bipolaris oryzae and B. sorokiniana and Infected Floral Sites on Cultivated Wild Rice. R. F. NYVALL, Professor, University of Minnesota, North Central Experiment Station, Grand Rapids 55744. J. A. PERCICH, Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108; R. A. PORTER, Research Associate, University of Minnesota, North Central Experiment Station, Grand Rapids 55744; and J. R. BRANTNER, Research Assistant, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 79:249-250. Accepted for publication 17 November 1994. Copyright 1995 The American Phytopathological Society. DOI: 10.1094/PD-79-0249.

The incidence of Bipolaris oryzae and B. sorokiniana in cultivated wild rice seed collected from two fields in Minnesota during 1991 and 1992 was related to disease severity on leaves. The site of Bipolaris spp. on the seed was primarily the awns. Caryopses were not infected under the conditions of this study. This is the first evidence for B. oryzae and B. sorokiniana being seedborne on cultivated wild rice and located primarily in the external tissues of the seed.

Keyword(s): Helminthosporium spp.