Turnip Mosaic Virus Strains in Southern Ontario, Canada. L. W. Stobbs, Research Scientist, Agriculture Canada, Research Station, Vineland Station, Ontario L0R 2E0. V. I. Shattuck, Assistant Professor, Horticulture Department, University of Guelph, Ontario N1G 2W1. Plant Dis. 73:208-212. Accepted for publication 4 October 1988. Copyright 1989 Department of Agriculture, Government of Canada. DOI: 10.1094/PD-73-0208.

Four strains of turnip mosaic virus (TuMV) were identified throughout the vegetable-growing regions of southern Ontario. Virus infection was associated predominantly with cruciferous hosts, with the highest incidence of infection occurring in rutabaga (Brassica napus subsp. rapifera) and winter canola (B. n. subsp. oleifera) plantings. The most widespread TuMV strain, TuMV-S1, appears to be similar to the TuMV-C3 strain reported in New York State, whereas the prevalence of the other strains depended largely on the presence of specific hosts. A fifth strain of TuMV was isolated from rutabaga grown in Joliette, Quebec. Certain cultivars of rutabaga and Chinese cabbage (B. campestris subsp. pekinensis) were determined to be resistant or immune to the five strains of TuMV.

Keyword(s): differential host range, ELISA.