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The members of this genus of plant viruses are similar to Tobacco mosaic virus. They infect solanaceous crops and other plants. Apart from the type species, other important members are Tomato mosaic virus and Pepper mild mottle virus. Common symptoms are mosaic, mottling, leaf distortion, necrosis and stunting.
The particles are extremely persistent and can survive outside plants for months and years. They usually spreads by plant contact and through seeds. The particles are rod-shaped about 300 x 18 nm in size, containing undivided positive-sense, single-stranded RNA.
Currently, the following species have been entered into the system: