grapevine leafroll-associated virus 2 grapevine leafroll-associated virus 2 grapevine leafroll-associated virus 2 (grlav2) is a virus infecting grapevine in the genus closterovirus. it is associated with rugose wood condition of grapevine. according to bosciai, 1995, grapevine corky bark-associated virus (gcbav) is a variant of grlav2. grapevine leafroll-associated virus 2 virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: martellivirales family: closteroviridae genus: closterovirus species: grapevine leafroll-associated virus 2