Separation of Montana Isolates of Wheat Streak Mosaic Virus on Michigan Amber Wheat. T. W. Carroll, Professor, Department of Plant Pathology, Montana State University, Bozeman 59717. S. K. Zaske, Laboratory Technician, and R. H. Brlansky, Former Postdoctoral Research Associate, Department of Plant Pathology, Montana State University, Bozeman 59717. Plant Dis. 66:916-918. Accepted for publication 1 February 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-916.

Eight isolates of wheat streak mosaic virus from winter wheat in central and eastern Montana were separated into two classes of variants or strains. Seven isolates were similar to the mild strain and one resembled the type strain of the virus. Separation was made by comparing the Montana isolates with the mild and type strains of the virus on the basis of symptoms caused in mechanically inoculated Michigan Amber wheat in the greenhouse.

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