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The Occurrence of Tobacco Ringspot Virus Strains and Tomato Ringspot Virus in Hosts Indigenous to North Carolina. M. C. Rush, Research Associate, Department of Plant Pathology, North Carolina State University, Raleigh 27607; G. V. Gooding, Jr., Associate Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27607. Phytopathology 60:1756-1760. Accepted for publication 6 July 1970. DOI: 10.1094/Phyto-60-1756.

Seventeen plant species indigenous to North Carolina were identified as hosts of tobacco ringspot virus (TRSV). Species not previously reported as hosts were Apocynum cannabinum, Erigeron annuus, Eupatorium capillifolium, Helenium amarum, Rubus allegheniensis, R. argutus, R. flagellaris, Rubus sp., Rumex obtusifolius, and Xanthium strumarium. Six isolates were serologically distinct from the common strain (NC-38) from tobacco in North Carolina, which is identical serologically to the American Type Culture Collection isolate Number 98. Comparison of the TRSV strains isolated from tobacco in a single field and from five species of weed plants growing the following year in the same field indicated that the NC-38 and NC-72 strains predominated in both the tobacco and weed species in this field. Tomato ringspot virus (Tom-RSV) isolates made up 11.2% of the ringspot virus isolates from weeds growing in the fallow tobacco field, and Tom-RSV was isolated from one tobacco plant.