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Relationships Among Some Ilarviruses: Proposed Revision of Subgroup A. Ichiro Uyeda, Former graduate research assistant, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350, Present address of senior author: Department of Botany, Faculty of Agriculture, Hokkaido University, Sapporo, Japan; Gaylord I. Mink, plant pathologist, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350. Phytopathology 73:47-50. Accepted for publication 3 May 1982. Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-47.

Two strains of asparagus virus II (AV II-P and AV II-S) and one isolate each of citrus leaf rugose virus (CLRV), citrus variegation virus (CVV), elm mottle virus (EMV), and Tulare apple mosaic virus (TAMV) were found to be serologically interrelated in tests with 11 antisera prepared against these viruses. Only three of the 11 antisera could detect all five viruses in either ring interface or agar gel double diffusion tests. None of the five viruses was related serologically to a group of four isolates comprising two serotypes of tobacco streak virus (TSV). The five serologically related viruses exhibited ultraviolet absorption maxima and minima at 262 and 245 nm, respectively, with A_260/280 values consistently lower than that of TSV. The results of these tests indicate that AV II, CLRV, CVV, EMV, and TAMV differ sufficiently from TSV to justify restructuring the subgroups. A revision of ilarvirus subgroup A was proposed based on these properties.