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Response of Trifolium hybridum Germ Plasm to Mechanical Inoculation with Bean Yellow Mosaic and Clover Yellow Vein Viruses in the Greenhouse. R. Alconero, USDA, ARS, Northeast Regional Plant Introduction Station, Geneva, NY 14456. Plant Dis. 67:1272-1273. Accepted for publication 2 June 1983. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/PD-67-1272.

Multiple inoculations with either bean yellow mosaic virus or clover yellow vein virus under greenhouse conditions resulted in the relatively rapid development of symptoms within 2 wk of the first inoculation in 7% of the 129 accessions tested. Most of the accessions (87%) showed a delayed response in all inoculated plants after four inoculations and 13 wk of observation. In six plant introductions, at least 20% of the plants tested remained symptomless for 6 mo although serology and bioassays detected low virus titers in most plants.