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The genus includes viruses resembling the Tobacco streak virus with isometric, non-enveloped particles of 3 different sizes, 26-35 nm large. Each of the 3 particle types has a different RNA molecule, but RNA3 is enclosed together with RNA4, a subgenomic fragment of RNA3 and 900 nucleotides long. The RNA molecules are linear, single-stranded and positive sensed. The existence of 3 types of particles separates the genus from related genera.
Symptoms include ringspots, line patterns, mosaics, mottling, streak patterns, and blight diseases. The viruses are transmitted by pollen, by mechanical means (e.g. sap) or by seeds. About half of the species are seed-borne. The name of the genus is an abbreviation for "isometric labile ringspot viruses".
Currently, the following species have been entered into the system: