1. U.S. Department of Agriculture-Agricultural Research Service, Forage Seed and Cereal Research Unit, Corvallis, Oregon 97331;,
2. Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97330
3. U.S. Department of Agriculture-Agricultural Research Service, Horticultural Crops Research Unit, Corvallis, Oregon 97330;
4. Plant Pathology Department, University of California, Davis, California, 95616-8751;