Effects of Wheat Soilborne Mosaic Virus on Hard Red Winter Wheat. R. M. Hunger, Associate Professor, Department of Plant Pathology, Oklahoma State University, Stillwater 74078-9947. C. R. Armitage, and J. L. Sherwood. Graduate Research Assistant, and Associate Professor, Department of Plant Pathology, Oklahoma State University, Stillwater 74078-9947. Plant Dis. 73:949-952. Accepted for publication 22 June 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0949.

The effects of wheat soilborne mosaic (WSBM) on 13 hard red winter wheat cultivars were evaluated using disease severity, enzyme-linked immunosorbent assay (ELISA), and virion concentration. The wheats were grown for two seasons in a location with no history of the disease and in a location with a history of severe WSBM. Resistant cultivars (Hawk, Mustang, Newton, Plainsman V, and Tam 108) showed lower disease severity and lesser reductions in height, grain yield, and 1,000 kernel weight (TKW) than susceptible cultivars (Chisholm, Danne, Payne, Sage, Tam 101, Tam 105, Triumph 64, and Vona). Mustang showed the least reduction in number of tillers (8.3%), height (4.2%), grain yield (31.6%), and TKW (0.8%). ELISA was useful to validate the presence of the virus. Results suggest that some mechanism(s) inhibits or slows capsid protein production and virion accumulation or production in cultivars resistant to WSBM.