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Isolation and Some Properties of a Yellow Subgroup Member of Cowpea Mosaic Virus from Illinois. M. R. McLaughlin, Graduate Research Assistant, Department of Plant Pathology, University of Illinois, Urbana, IL 61801; Pornpod Thongmeearkom(2), G. M. Milbrath(3), and Robert M. Goodman(4). (2)(3)Graduate Research Assistant, and Assistant Professor, Department of Plant Pathology, University of Illinois, Urbana, IL 61801; (4)Assistant Professor, Department of Plant Pathology and International Soybean Program, University of Illinois, Urbana, IL 61801. Phytopathology 67:844-847. Accepted for publication 26 January 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-844.

A twelve-spotted cucumber beetle collected in a soybean field in Edwards County, Illinois, transmitted cowpea mosaic virus (CPMV) to test plants. Infectious CPMV also was recovered when the beetle was homogenized and the homogenate inoculated to test plants. The CPMV isolate from Illinois (CPMV-IL) was identified as a member of the yellow subgroup of CPMV based on host range and serology. Isolate CPMV-IL produced less top component than did another member of the yellow subgroup, CPMV-Sb. Both isolates possessed two electrophoretic forms of essentially equal mobilities; CPMV-IL consistently had a higher proportion of fast to slow form than did CPMV-Sb. This is the first report of natural occurrence of a member of the yellow subgroup of CPMV in the United States.