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The viruses of this genus are similar to the Triticum mosaic virus (TriMV) and cause mosaic diseases on gramineous plants. Currently the genus contains two species (see below) which infect wheat, sugarcane and sorghum in different regions. TriMV is transmitted by plant-feeding mites.
The particles are filamentous (680-750 nm long) and are associated with characteristic inclusion bodies in the infected cells. The genome consists of monopartite single-stranded and positive-sensed RNA, around 10 kb large. It encodes a large polyprotein. The genus has been created, based on the DNA structure of its members.
Currently, the following species have been entered into the system: