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February 2017 WINES&VINES 75 PRACTICAL WINERY & VINEYARD GRAPEGROWING interquartile range (the differ- ence between the first and third quartile, representing 50% of all observations made), and the whiskers show the range be- tween maximum EL value and minimum EL value for the treat- ment. The boxes representing the early and late-pruned spurs did not overlap. The interquartile range for early pruned treatment was EL Stage 38 (50% véraison) to EL Stage 40 (80% véraison). The interquartile range for the late- pruned treatments was EL Stage 36 (30% véraison) to EL Stage (50% véraison). The single-vine v a r i a b i l i t y i n p h e n o l o g i c a l stages on the opposite cordon and alternate spur treatment was the combination of early and late-pruned spurs variabil- ity, which ranged from 0% to 10% up to 80% véraison on the same vine. The approximate one-week delay in onset of véraison for clusters on late-pruned vines was equivalent to a 1.0º to 1.5º lower Brix level on Aug. 26, which was three weeks after completion of véraison (see table "Fruit Maturity on Aug. 26, 2015"). There was no effect of pruning date on the pH or titrat- able acidity. Combining fruit from late- pruned and early pruned treat- ments would lower Brix by about Providing leading wine makers with stainless steel barrels of high quality, durability, and design. phone: 773.735.0700 • toll free: 800.441.8780 www.skolnikwine.com • email: sales@skolnik.com Shoot-to-shoot variability is evident in the onset of véraison for alternate spurs (left) and opposite cordons (right). Early Late