Weather Variables for Within-Vineyard Awareness of Botrytis Risk
Table 2
Descriptors of each epidemic of botrytis bunch rot (BBR) in relation to ripening of Riesling vines.
Locality, vineyard-vineyard-block
Season
Canopy vigour and crop load (vigour/load)
Previous season BBR severity
Date of 5% capfall
Estimated date for 3% BBR severityb
Estimated date for 20°Brix of grape juiceb
Date of final assessment for BBR severity
Late season intervalf (days)
Final mean BBR severity (%) ± standard error (number of bunches)
Epidemic ratei
CP 1-1
2009-10
Not recorded
No data
Dec 2a
Apr 2
No data
Apr 9
(53)g
7.69 ± 0.60 (500)
0.1365
CP 1-1
2010-11
Medium/medium
≥3%
Dec 8
Apr 3
Apr 21
Apr 19
77
10.5h ± 0.85 (400)
0.1276
CP 1-1
2011-12
Medium/not recorded
≥3%
Dec 4
Mar 13
Mar 20
Mar 27
46
10.9 ± 0.71 (400)
No data
CP 1-1
2012-13
Medium/medium
≥3%
Dec 4
Mar 11
Mar 22d
Apr 2
59
23.0 ± 0.86 (400)
No data
CP 1-1
2013-14
Low/low
≥3%
Dec 10
Mar 30
No data
Mar 31
44
4.7 ± 0.58 (460)
0.2066
CP 2-1
2013-14
High/low
<3%
Dec 5
May 15c
No data
Apr 8e
48
1.5 ± 0.34 (420)
No data
Kay 1-1
2009-10
Medium/not recorded
No data
Dec 6
Mar 3
Apr 4
Apr 26
80
95.2 ± 0.34 (400)
0.1242
Kay 1-2
2012-13
Medium/medium
≥3%
Dec 10
Mar 22
Apr 2
Apr 23
70
37.7 ± 1.37 (400)
0.1001
aDefault value (actual date not recorded). bFrom linear regression where n = 3 or 4. cFrom linear interpolation because n = 2. dBeyond harvest date. eMore than 5 days before harvest date. fNumber of days between véraison and final assessment of BBR severity; g15 Feb used as a default value for veraision. hLikely an underestimate or inaccurate because bunches with severe mould were remove. iUsing the method of Beresford et al. [47]; n = 3 or 4 and was 0.91–0.98.
