Tomato black ring virus (TBRV) was first reported in the UK (Smith, 1946). Although early studies first described TBRV and beet ringspot virus (BRSV) as distinct viruses (Harrison, 1957a(Harrison, , 1957b(Harrison, , 1958, soon afterwards they were considered serologically distinct strains of TBRV (Murant, 1970). More recently, the International Committee on Taxonomy of Viruses (ICTV) recognized them as closely related but distinct members of the genus Nepovirus (family Secoviridae) subgroup B (Lefkowitz et al., 2018). Subgroup B is characterized by having a bipartite genome comprising single-stranded, positive-sense RNAs: RNA1 codes for proteins involved in replication and polyprotein cleavage and