Weather Variables for Within-Vineyard Awareness of Botrytis Risk
Table 4
In-season weather variables derived using temperature, relative humidity, and rainfall and associations with final mean BBR severity. VPD = vapour pressure deficit calculated from temperature and relative humidity (RH) [33].
Locality, vineyard-vineyard-block
Year of grape harvest
Mean BBR severity (%) at final assessment
Cumulative rainfall days ≥1 mm, March 1 to final botrytis assessment
Median daily RH (%) at 15:00: E-L 34 to final BBR assessment
VPDair (kPa) at 15:00 each day: E-L 34 to final BBR assessment
Median VPDair
Median VPD with 2°C differentialb
Slope of linear regressioncfor accumulated daily values
Accumulated daily values: véraison to estimated date of 3% botrytis severity
CP 1-1
2010
7.7
8
47.2
1.45
1.13
1.564
75
CP 1-1
2011
10.5a
12
53.4
1.16
0.85
1.212
79
CP 1-1
2012
10.9
8
53.9
1.28
0.98
1.396
48
CP 1-1
2013
23.0
5
45.1
1.67
1.32
1.834
76
CP 1-1
2014
4.7
3
43.2
1.47
1.18
1.582
64
CP 2-1
2014
1.5
5
43.8
1.28
1.02
1.465
No data
Kay 1-1
2010
95.2
6
63.2
0.96
0.66
0.959
31
Kay 1-2
2013
37.7
9
58.6
1.06
0.73
1.056
53
Correlation coefficientd
0.250
0.833
−0.675
−0.717
−0.721
−0.735
aLikely an underestimate because bunches with severe mould were removed by vineyard workers. bCalculation accounts for a 2°C difference between the temperature of the leaf or fruit surface and that of the air. cRange of : 0.975–0.995. dPearson’s coefficient excluding data for Campania site 1 in 2010 (E-L dates imprecise) and 2011 (BBR severity likely underestimated); n = 5 or 6.
