vitivirus vitivirus vitivirus is a genus of viruses in the order tymovirales, in the family betaflexiviridae. plants serve as natural hosts. there are 15 species in this genus. vitivirus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: tymovirales family: betaflexiviridae subfamily: trivirinae genus: vitivirus taxonomy the genus contains the following species: actinidia virus a actinidia virus b arracacha virus v blackberry virus a grapevine virus a grapevine virus b grapevine virus d grapevine virus e grapevine virus f grapevine virus g grapevine virus h grapevine virus i grapevine virus j grapevine virus k grapevine virus l grapevine virus m grapevine virus n grapevine virus o heracleum latent virus mint virus 2 structure viruses in vitivirus are non-enveloped, with flexuous and filamentous geometries. the diameter is around 12 nm. genomes are linear, around 7.6kb in length. the genome codes for 5 proteins. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation vitivirusfilamentousnon-envelopedlinearmonopartite life cycle viral replication is cytoplasmic, and is lysogenic. entry into the host cell is achieved by penetration into the host cell. replication follows the positive stranded rna virus replication model. positive stranded rna virus transcription is the method of transcription. the virus exits the host cell by tubule-guided viral movement. plants serve as the natural host. the virus is transmitted via a vector (mechanical inoculation pseudococcid mealybugs and aphids). transmission routes are vector and mechanical. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission vitivirusplantsnoneviral movement; mechanical inoculationviral movementcytoplasmcytoplasmmechanical inoculation: pseudococcid mealybugs; mechanical inoculation: aphids