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This genus of plant viruses currently includes 19 species which resemble the Potato leafroll virus (PLRV). They have a world-wide distribution and can cause important diseases of crops. Apart from PLRV, viruses like Beet western yellows virus or Sugarcane yellow leaf virus result in substantial yield losses. The viruses are transmitted by aphids in a persistent manner and infect a large variety of crops, ranging from legumes to cereals to cucurbits.
The viruses have isometric particles with a diameter of 25-30 nm. The genome is monopartite consisting of positive-sense single stranded RNA with 5,600 to 6,000 nucleotides and 6 open reading frames.
Currently, the following species have been entered into the system: