Winetech Technical Yearbook 2022

TABLE 1. Vineyard measurements and harvest data obtained in 2017/2018.

Stomatal conductance (mmol m-² s-¹)#

Main shoot length (cm)*

Lateral shoot length (cm)*

Berry weight – 50 berries (g)^

Bunch numbers^

Bunch weights^

Vineyard Treatment

AS

106.58 ± 31.34 a 57.98 ± 29.45 a 2.08 ± 1.07 a 61.70 ± 1.84 b 19.17 ± 6.34

1.82 ± 0.59

Cabernet Sauvignon A

SV

51.00 ± 31.53 b 9.14 ± 6.19 b 1.52 ± 1.50 b 71.68 ± 2.33 ab 20.10 ± 10.20

1.86 ± 1.31

SVLH

73.54 ± 3.70 a 19.40 ± 8.70

1.61 ± 0.80

AS

93.10 ± 22.94 48.78 ± 23.65

2.63 ± 1.44

75.03 ± 2.91 32.13 ± 20.38

3.04 ± 2.30

Cabernet Sauvignon B

SV

63.64 ± 18.81 35.06 ± 43.04

2.20 ± 1.91

64.98 ± 8.28 34.40 ± 14.05

3.44 ± 1.70

SVLH

72.31 ± 2.87 38.35 ± 14.55

3.49 ± 1.54

AS

91.12 ± 18.27 a 47.34 ± 25.12 a 3.12 ± 2.08 a 94.50 ± 4.60 a 21.25 ± 4.85 4.57 ± 1.80 a

Merlot noir

SV

60.84 ± 11.62 b 10.34 ± 13.04 b 1.07 ± 0.76 b 62.44 ± 3.48 c

25.40 ± 8.32 3.68 ± 1.45 b

SVLH

81.10 ± 1.68 b 25.95 ± 15.05 2.98 ± 1.78 b

Cabernet Sauvignon A Cabernet Sauvignon B

*

**

***

*

ns

ns

p-value

ns

ns

ns

ns

ns

ns

Merlot

*

*

***

***

ns

**

*- Mean values n=5 determined at pea-size; # - Mean value, n=3 determined on three days throughout the season; ^ - Mean value, n=20 grapevines determined at harvest.

TABLE 2. Grape juice analysis at harvest.

2016/2017

Vineyard

Treatment

Brix

pH

TA

AS

24.9 ± 0.73 a

3.66 ± 0.11 a

6.8 ± 0.24 b

Cabernet Sauvignon A

SV

22.7 ± 0.37 b

3.44 ± 0.04 b

7.66 ± 0.03 a

SVLH

23.5 ± 0.25 b

3.37 ± 0.04 b

7.10 ± 0.34 b

AS

26.3 ± 0.37 a

3.47 ± 0.04 a

7.07 ± 0.15 b

Cabernet Sauvignon B

SV

22.5 ± 0.60 c

3.34 ± 0.01 b

8.28 ± 0.15 a

SVLH

24 ± 0 b

3.38 ± 0.04 b

6.76 ± 0.13 b

Cabernet Sauvignon A

**

**

*

p-value

Cabernet Sauvignon B

***

**

***

2017/2018

Vineyard

Treatment

Brix

pH

TA

AS

25.40 ± 0.36 a

3.64 ± 0.01 a

6.02 ± 0.19

Cabernet Sauvignon A

SV

22.80 ± 0.80 b

3.39 ± 0.06 b

6.37 ± 0.51

SVLH

25.45 ± 0.35 a

3.39 ± 0.02 b

6.57 ± 0.14

AS

23.67 ± 0.51 a

3.36 ± 0.02 a

6.19 ± 0.17 b

Cabernet Sauvignon B

SV

21.13 ± 0.23 b

3.20 ± 0.01 b

7.14 ± 0.11 a

SVLH

23.35 ± 0.35 a

3.27 ± 0.01 c

6.73 ± 0.12 c

AS

23.70 ± 0.10 a

3.58 ± 0.01

5.87 ± 0.13

Merlot noir

SV

22.20 ± 0.17 c

3.41 ± 0.06

6.12 ± 1.73

SVLH

23.05 ± 0.45 b

3.62 ±0.03

6.07 ± 0.12

Cabernet Sauvignon A

**

***

ns

p-value

Cabernet Sauvignon B

***

***

***

Merlot

**

ns

ns

ANOVA was used to compare data. Asymptomatic vine – AV; Symptomatic vines – SV; and Symptomatic vine late harvest – SVLH. Mean followed by significant letters in a row are significant at p<0.05 (Fischers LSD). The standard deviation of three replicates per treatment were determined. Significance of one-way ANOVA for virus presence on the grape parameters. Significance (*, ** and *** indicate significance at p≤0.05, 0.01 and 0.001 respectively; ns: not significant).

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WINETECH TECHNICAL YEARBOOK 2022