Comparative Host Suitabilities of Snap Beans to the Soybean Cyst Nematode (Heterodera glycines). T. A. Melton, Extension Nematologist, Department of Plant Pathology, University of Illinois, Urbana 61801. G. R. Noel, Research Plant Pathologist, USDA, ARS, and B. J. Jacobsen, Professor, Department of Plant Pathology, University of Illinois, Urbana 61801; and D. J. Hagedorn, Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 69:119-122. Accepted for publication 5 July 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-119.

Twenty-three bush-type snap bean (Phaseolus vulgaris) lines were evaluated for their suitabilities as hosts for two populations of soybean cyst nematode (Heterodera glycines) using naturally infested soil in a greenhouse. Except for its sister line WIS (RRR) 46, WIS (RRR) 36 was a less suitable host (P <0.05) than all other snap beans. Populations of white females from 12 commercial snap bean cultivars were equal to or greater than the susceptible soybean (Glycine max) cultivar Williams 79 for the race 3 population. Additionally, 18 snap bean cultivars supported the same number of white females per plant as did Williams 79 for the second population, which was similar to race 4. This wide range of host responses suggests that resistance is controlled by more than one gene.

Keyword(s): host range.