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The viruses of this genus resemble the Barley stripe mosaic virus. Two species are widely distributed and cause infections in cereals and grasses with mosaic symptoms, chlorotic streaks or necrosis. Infections might also cause mild mottling or no symptoms. The viruses are transmitted through seeds.
Each virus has 3 positive and single-stranded RNA molecules (called α, β and γ), each encapsidated in a separate particle. Therefore, 3 sizes of particles are present with a length of around 150-160, ~125 and ~110 nm. The genus is most closely related to Pecluvirus.
Currently, the following species have been entered into the system: