Received for publication August 7, 1972. Published as Paper No. 3446, Journal Series, Nebraska Agricultural Experiment Station. Research was conducted under Project No. 20-3.
Professor, Department of Horticulture and Forestry; Professor, Department of Plant Pathology; Technician, Department of Horticulture and Forestry. The effect of bacterial concn on disease reaction was studied at Cornell University, Ithaca, N. Y. Appreciation is expressed for the assistance of Robert Dickey, Department of Plant Pathology and D. H. Wallace, Department of Plant Breeding and Biometry.