Grapevine leafroll-associated viruses

Grapevine leafroll-associated virus (GLRaV) is a name for a group of viruses that infect grapevine.^[1]

Grapevine leafroll-associated viruses
Scientific classification
(unranked):	Virus
Realm:	Riboviria
Kingdom:	Orthornavirae
Phylum:	Kitrinoviricota
Class:	Alsuviricetes
Order:	Martellivirales
Family:	Closteroviridae
Groups included
Grapevine leafroll-associated virus 1 Grapevine leafroll-associated virus 2 Grapevine leafroll-associated virus 3 Grapevine leafroll-associated virus 4 Grapevine leafroll-associated virus 7 Grapevine leafroll-associated virus 13
Cladistically included but traditionally excluded taxa
Other viruses in Closteroviridae

Obscure mealybugs (Pseudococcus viburni) feed on the phloem of vines and woody-stemmed plants, especially pear and apple trees and grape vines.^[2] Some individuals are vectors for infectious pathogens and can transmit them from plant to plant while feeding; mealybug-spread grapevine leafroll associated virus type III (GRLaV-3), in particular, has wreaked havoc among the grapes of New Zealand, reducing the crop yield of infected vineyards by up to 60%.^[3]

The biggest problems in Grapevine Leafroll Disease are reduced grape yield, altered grape ripening, and altered grape chemistry.^[4]: 623 Leafroll viruses are associated with rugose wood condition of grapevine.^[5]