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Reactions of Maize (Zea mays) Accessions to Maize Rayado Fino Virus. R. W. Toler, Professor, Department of Plant Sciences, Texas Agricultural Experiment Station, College Station 77843. Glenn Skinner, Graduate Assistant, and A. J. Bockholt, Associate Professor, Department of Soil and Crop Sciences, and K. F. Harris, Associate Professor, Department of Entomology, Texas Agricultural Experiment Station, College Station 77843. Plant Dis. 69:56-57. Accepted for publication 19 June 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-56.

Fifty-eight North American maize accessions were evaluated for their sensitivity to maize rayado fino virus (MRFV) on the basis of percent infection and symptom expression, including stunting. No immunity or resistance was observed in any accession tested, only different degrees of susceptibility. The accessions were classed into four susceptibility groups. Seven entries were moderately susceptible, 17 were intermediately susceptible, 13 were susceptible, and 21 were highly susceptible. No commercially acceptable level of resistance was found in the North American germ plasm tested. North American maize germ plasm seems very vulnerable to this disease.