grapevine virus b grapevine virus b grapevine virus b is plant virus species in the genus vitivirus. it is associated with rugose wood (corky bark) symptoms in grapevine. grape vine virus b virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: tymovirales family: betaflexiviridae genus: vitivirus species: grape vine virus b