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Resistance

Susceptibility and Immunity in Soybean to Beet Western Yellows Virus. James E. Duffus, Plant Pathologist, United States Department of Agriculture, U.S. Agricultural Research Station P.O. Box 5098, Salinas, CA 93901; Gene M. Milbrath, Assistant Professor, Department of Plant Pathology, University of Illinois, Urbana, IL 61801. Phytopathology 67:269-272. Accepted for publication 18 August 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-269.

Thirty-five soybean cultivars either related to or with a pedigree similar to that of cultivar Wells were evaluated for susceptibility to beet western yellows virus (BWYV). Some cultivars were susceptible, some apparently were immune, and the data for others indicated either heterogeneity in, or possibly an intermediate level of, susceptibility. All of the susceptible cultivars tested in this study were derived from crosses that traced back to Mandarin, a soybean cultivar introduced from northeastern China in 1911 and to AK which was introduced to the U.S. from Manchuria in 1912. Plants infected with BWYV showed various degrees of interveinal yellowing and stunting or were symptomless in the greenhouse. The data support the hypothesis that BWYV probably is related to other yellowing viruses of legumes reported from different parts of the world.