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This genus contains plant viruses similar to the Beet yellows virus. These are widespread and infect various crops causing symptoms like yellowing, necrosis and leafrolling. In particular the phloem is infected. Some species cause important diseases like Citrus tristeza virus on citrus or Beet yellows virus on beet. They can be transmitted mechanically or by insects, mainly aphids, in a semi-persistent manner.
The particles are filamentous and flexuous, between 1,000 and 2,000 nm long. The genome consists of positive-stranded monopartite RNA, 15.5-19.3 kb in size. It encodes a 22-25 kDa major coat protein (CP) and the divergent CP analogue (CPd) upstream of the CP cistron.
Currently, the following species have been entered into the system: