grapevine leafroll-associated virus 3 grapevine leafroll-associated virus 3 grapevine leafroll-associated virus 3 (glrav-3) is a grapevine infecting virus in the family closteroviridae, genus ampelovirus. grapevine leafroll-associated virus 3 virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: martellivirales family: closteroviridae genus: ampelovirus species: grapevine leafroll-associated virus 3 glrav-3 is an economically important virus causing grapevine leafroll disease in grapevine worldwide.