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Table 6 Proportion of vineyard blocks surveyed that are infected with different viruses

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

Viruses detected

No. of vine blocks tested

No. of positive blocks

Percentage of positive blocks (%)

No. of blocks in which all sample tested positive

Percentage of blocks in which all sample tested positivea

GLRaV-3

137

94

68.6

36

38.3

GLRaV-2

137

16

11.7

1

6.3

GLRaV-1

137

12

8.8

0

0.0

GRBV

137

36

26.3

8

22.2

GPGV

137

62

45.3

5

8.1

GRSPaV

127

117

92.1

109

93.2

GVA

137

20

14.6

3

15.0

GVB

137

9

6.6

4

44.4

ToRSV

127

1

0.8

0

0.0

ArMV

127

1

0.8

0

0.0

GFkV

137

60

43.8

18

30.0

GRVFV

127

17

13.4

1

5.9

GAMaV

127

16

12.6

0

0.0

GSyV-1

127

7

5.5

0

0.0

  1. The full names of viruses that are included in this survey are provided in the abbreviations
  2. aThe percentage is obtained by the number of blocks, in which all the samples are positive for a given virus, divided by the number of positive blocks for the virus