COMPARISON OF FUNGAL BROWN SPOT SEVERITY TO INCIDENCE OF SEED-BORNE BIPOLARIS-ORYZAE AND B-SOROKINIANA AND INFECTED FLORAL SITES ON CULTIVATED WILD-RICE

The incidence of Bipolaris oryzae and B. sorokiniana in cultivated wil d rice seed collected from two fields in Minnesota during 1991 and 199 2 was related to disease severity on leaves. The site of Bipolaris spp . on the seed was primarily the awns. Caryopses were not infected unde r the conditions of this study. This is the first evidence for B. oryz ae and B. sorokiniana being seedborne on cultivated wild rice and loca ted primarily in the external tissues of the seed.