Maize Dwarf Mosaic Virus in Idaho. R. L. Forster, Assistant Professor, Department of Plant and Soil Sciences, University of Idaho, Kimberly 83341. R. L. Stoltz, Assistant Extension Professor of Entomology, University of Idaho Cooperative Extension Service, Twin Falls 83301; H. S. Fenwick, Extension Professor, Department of Plant and Soil Sciences, University of Idaho, Moscow 83843; and W. R. Simpson, Research Professor, Department of Plant and Soil Sciences, University of Idaho, Parma 83660. Plant Dis. 64:410-411. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-410.

Maize dwarf mosaic virus was identified in sweet corn plants in Idaho during 1977, the first report of the disease in the Pacific Northwest. Massive flights of aphids contributed to the incidence of the disease, and yield reductions of 75% or greater were noted in severely affected fields. Plants in late-seeded fields were most susceptible.

Keyword(s): epidemiology, Schizaphis graminum, Zea mays L. var. saccharata.