Weather Variables for Within-Vineyard Awareness of Botrytis Risk

Table 3

In-season weather variables derived from temperature and/or surface wetness duration with a 4 h dryout period. There are no data for CP vineyard 2-1.

Locality, vineyard-vineyard-block	Year of grape harvest	Mean BBR severity (%) at final assessment	Mean daily maximum air temperature from E-L 19 to E-L 31	Mean wetness duration^b (h) for days with a BI > 0 from E-L 19 to E-L 31	Mean BI for days with a BI > 0 from E-L 19 to E-L 31	Accumulated daily BI (Figures 1(a)–1(f))
						E-L 19 to E-L 34	Slope of linear regression with time^c: E-L 19 to E-L 34	E-L 19 to estimated date of 3% botrytis severity
CP 1-1	2010	7.7	24.9	8.44	0.38	27	0.321	48
CP 1-1	2011	10.5^a	24.0	10.7	0.52	30	0.580	67
CP 1-1	2012	10.9	25.1	10.3	0.53	32	0.433	44
CP 1-1	2013	23.0	26.3	7.89	0.40	19	0.265	31
CP 1-1	2014	4.7	22.3	8.67	0.41	26	0.372	45
Kay 1-1	2010	95.2	22.3	12.1	0.66	40	0.644	57
Kay 1-2	2013	37.7	23.4	9.79	0.52	31	0.474	55
		Correlation coefficient^d	−0.416	0.787	0.840	0.717	0.823	0.628

^aLikely an underestimate because bunches with severe mould were removed by vineyard workers. ^bUsing the variable wet_TFW_dryout (4 h dryout period). ^cRange of : 0.985–0.999. ^dPearson’s coefficient excluding data for CP site 1 in 2010 (E-L dates imprecise) and 2011 (BBR severity likely underestimated); n = 5.