Delayed Pruning of Grapevines Paul Petrie TWE Victor Sadras & Martin Moran, SARDI
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Delayed Pruning of Grapevines
Paul Petrie TWE
Victor Sadras & Martin Moran, SARDI
2
Vintage becoming earlier
Coonawarra Cabernet
Sauvignon
1.7 Days per year
3
30-Jan
09-Feb
19-Feb
29-Feb
10-Mar
20-Mar
30-Mar
1992 1997 2002 2007 2012
Da
y o
f Y
ea
r
CHR
CAS
Linear (CHR)
Linear (CAS)
Vintage becoming earlier
McLaren Vale Cabernet
Sauvignon
2.1 Days per year
McLaren Vale Chardonnay
1.4 Days per year
4
30-Jan
09-Feb
19-Feb
29-Feb
10-Mar
20-Mar
30-Mar
1992 1997 2002 2007 2012
Da
y o
f Y
ea
r
CHR
CAS
Linear (CHR)
Linear (CAS)
Vintage becoming more compressed
McLaren Vale Cabernet
Sauvignon
2.1 Days per year
McLaren Vale Chardonnay
1.4 Days per year
Peak Demands on
Harvesting and Crushing
Facilities are Increasing
21 Days
9 Days
5
Vintage becoming more compressed
Barossa Shiraz
2006 vs 1998
Day which blocks reached
12Be
Percent regional yield
Maturity (12Be) Date
Pe
rce
nt
of
Re
gio
na
l S
HI Y
ield
0%
20%
40%
60%
80%
100%
14-F
eb
21-F
eb
28-F
eb
7-M
ar
14-M
ar
21-M
ar
28-M
ar
4-Apr
11-A
pr
2006
1998
6
By delaying maturity can we delay harvest?
Delay maturity into a cooler part of the season
Better quality?
Improved harvest logistics
Harvest at optimal time
Better use of facilities
Reduced risk
Extreme events i.e. heat wave
7 7
Winter Spring Summer Autumn
Delayed
Pruning
Can we use delayed pruning in order to delay harvest and move ripening into a
cooler part of the season?
Adaptation strategies in the vineyard Year 1 delayed pruning trial
Standard
Pruning
8
By delaying maturity can we delay harvest?
Five Pruning Dates
26 May (early normal)
4 August (late normal)
5 September (bud burst)
22 September
18 October
No pre-pruning
Unpruned 22 September (Shiraz)
9
By delaying maturity can we delay harvest?
Five Pruning Dates
26 May (early normal)
4 August (late normal)
5 September (bud burst)
22 September
18 October
Pruned 26 May and 22 September (Shiraz)
10
0
5
10
15
20
25
30
35
1/Sep 1/Oct 1/Nov 1/Dec 1/Jan 1/Feb
E-L
Sta
ge
26-May
4-Aug
5-Sep
22-Sep
13-Oct
Tracked Phenology during the growing season
The range in phenology
between the treatments
varied
Smallest during flowering
Largest early and late in
the season
11
Tracking fruit colour at veraison (11 January)
Pruned 26 May Pruned 22 Sept Pruned 13 Oct
12 12
Adaptation strategies in the vineyard Year 1 delayed pruning trial
Pruned in May Pruned in September
13
0
20
40
60
80
100
4/Jan 18/Jan 1/Feb 15/Feb 29/Feb
% C
olo
ure
d B
err
ies
26-May
4-Aug
5-Sep
22-Sep
13-Oct
Tracking fruit colour at veraison
Visual scoring
Large spread between
later pruning times.
14
Tracking Maturity
5
7
9
11
13
15
17
19
20/Jan 3/Feb 17/Feb 2/Mar 16/Mar 30/Mar
Ba
um
e
26-May
4-Aug
5-Sep
22-Sep
13-Oct
Large spread between
later pruning times
Earlier pruning times
now closer
Fruit harvested about
14.5 Be for winemaking
15
0
0.5
1
1.5
2
2.5
20/Jan 3/Feb 17/Feb 2/Mar 16/Mar 30/Mar
An
tho
cy
an
ins
(m
g/g
)
26-May
4-Aug
5-Sep
22-Sep
13-Oct
Anthocyanins
Later pruning dates
catch up
13 October is delayed
As per Iland
Wine quality?
16
Yield components
Pruning
Date
Harvest
Date
Yield
(kg/vine)
Bunch
No
Bunch Wt
(g)
Berry Wt
(mg)
Pruning Wt
(g)
26 May 20 Feb 3.9 64.5 51.7 1.1 1137
4 Aug 20 Feb 3.6 67.6 58.0 1.1 1161
5 Sept 28 Feb 2.6 57.3 43.8 1.0 1118
22 Sept 5 March 3.1 78.6 44.1 0.9 887
13 Oct 4 April 1.4 47.3 27.7 0.9 453
Thinned vines yielded approximately 3kg
17
4
6
8
10
12
14
16
24/0
1/20
12
31/0
1/20
12
7/02
/201
2
14/0
2/20
12
21/0
2/20
12
28/0
2/20
12
6/03
/201
2
13/0
3/20
12
20/0
3/20
12
27/0
3/20
12
Ba
um
e
Blue
Pink
Yellow
White
Green
Tracking Maturity CAS
Less spread than
Shiraz
Earlier pruning times
now closer
Fruit harvested about
13.5 Be for winemaking
18
Cabernet Sauvignon yield components
Pruning
Date
Harvest
Date
Yield
(kg/vine)
Bunch
No
Bunch Wt
(g)
Berry Wt
(mg)
Pruning Wt
(g)
26 May 13 Mar 4.0 61 66.5 1.3 2115
4 Aug 19 Mar 4.0 58 66.7 1.2 1836
5 Sept 22 Mar 6.3 71 89.5 1.1 1832
22 Sept 26 Mar 6.2 80 78.3 1.1 1678
13 Oct 4 April 3.5 63 59.5 1.2 1648
19
Acknowledgements
Harry Driscol & Brian Peitch – Database
Greg Wittingham – Phenology
Andrew McLean – Site access
Ethan Nicosia – Berry counting
Craig Galletly & Louise Pridham – Maturity analysis
Brenton Porter & Sara Grafton – Anthocyanin & tannin analysis
Co-authors
Samuel J. Brook – Former Technical Officer, TWE
Martin A. Moran – Research Officer, SARDI
Victor O. Sadras – Research Scientist, SARDI
20
Questions
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