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Table 7 Prevalence of major grape viruses in V. vinifera grapes based on period of vineyard establishment

From: Survey for major viruses in commercial Vitis vinifera wine grapes in Ontario

Year of Planting No. of samples tested GRSPaV GLRaV-3 GPGV GRBV GVA GVB GLRaV-2 GLRaV-1
1974–1990 45 91.1 71.1 13.3 2.2 53.3 22.2 6.7 8.9
1991–2005 357 92.7 55.7 21.8 17.9 3.6 2.8 2.0 2.0
2006–2016 74 95.9 37.8 25.7 6.8 1.4 0.0 0.0 0.0
Total 476 443 259 103 70 44 20 10 11
  1. The full names of viruses that are included in this survey are provided in the list of abbreviations
  2. Shown are the percentages of samples tested positive for each virus over the total number of samples collected from grapevines planted in a specific period of years