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Vineyards in the Finger Lakes region in New York were surveyed for the three major viruses associated with leafroll disease, i.e., Grapevine leafroll-associated virus 1 (GLRaV-1), Grapevine leafroll-associated virus 2 (GLRaV-2), and Grapevine leafroll-associated virus 3 (GLRaV-3). Target viruses were detected in nearly two-thirds (68%, 65 of 95) of the vineyard blocks surveyed by enzyme-linked immunosorbent assay. Single infections by GLRaV-1, GLRaV-2, and GLRaV-3 occurred in 10% (113 of 1,124), 3% (36 of 1,124), and 15% (173 of 1,124) of the samples tested, respectively, whereas mixed infections affected 3.6% (40 of 1,124) of them, essentially with GLRaV-1 and GLRaV-3 (2.5%, 28 of 1,124). Presence of the target viruses was confirmed in selected samples by reverse transcription-polymerase chain reaction and sequencing. Comparative analysis indicated moderate to high nucleotide sequence identities in the second diverged copy of the GLRaV-1 coat protein gene (81.0 to 86.7%), GLRaV-2 coat protein gene (87.6 to 99.2%), and GLRaV-3 heat shock protein 70 homologue gene (91.5 to 98.3%) of New York isolates with corresponding virus reference strains. The prevalence of the three major leafroll disease-associated viruses in Finger Lakes vineyards results likely from poor sanitary status of planting materials, stressing the need to reinstate a certification program in New York.

Survey for the Three Major Leafroll Disease-Associated Viruses in Finger Lakes Vineyards in New York