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This genus includes plant viruses which are similar to Potato virus X. The particles are non-enveloped, very long and flexuous, 470-1000 nm or longer with a diameter of 12-13 nm. They frequently aggregate in the cytoplasm. The viruses are readily transmissible by sap (they are stable in sap for several weeks) and might also spread via insects. They cause mosaic, ringspot and necrosis diseases on many monocotyledonous and dicotyledonous plants. However, individual species usually have a limited host range.
Currently, the following species have been entered into the system: