Received for publication on September 17, 1973. Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 7352.
Research Professor and Assistant Research Professor of Home Economics, respectively, Department of Bacteriology and Biochemistry, University of Idaho, Moscow, and Research Professor of Plant Pathology, Department of Plant and Soil Sciences, Bean Research Laboratory, University of Idaho, Twin Falls.
The authors thank Goldie Brausen, Julia M. Rolland, and Nancy C. Ladiges for laboratory assistance, and Dale O. Everson for statistical analysis of the data.