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66 P R A C T I C A L W I N E R Y & V I N E YA R D July 2015 18 vines (six vines x three rows) of each selection. The vines were pruned to 12 two- bud spurs per vine and were crown- suckered to ensure each vine had the same number of shoots. Cluster-thinning was performed so that all shoots had two clusters. Occasional winged-clusters were removed to decrease the potential for bunch rot. Weed control, fertilization and fungicide treatments were the same across the entire block. In 2013, a group of California wine- makers from ZAP and researchers gath- ered to taste and rank wines made from the 20 selections. Six selections were chosen as distinctive, and these were advanced to intensive viticultural and fruit analysis to determine if these fea- tures correlated with the observed wine differences. In addition to the six selections, one of the original FPS Zinfandel selections that had been available for growers for many years was included, along with a Primitivo selection from Italy, both of which had been planted alongside the Heritage selections at the Oakville Station. This study evaluated five data vines in the middle of each six-vine x three-row replicate. All samples were collected on Sept. 25, 2013. Clusters and berries were randomly selected from across the vine from both interior and exterior positions. Two clusters were harvested from each of the five vines, one on the north and one on the west side of each vine. The 100 berry samples were processed and analyzed at the UC Davis Teaching Winery Laboratory the following day for the following viticultural and enologi- cal properties: fresh berry weight, Brix at harvest, titratable acidity, pH, yeast assimilable nitrogen (YAN) and malic acid. Ten clusters were weighed to gener- ate an average cluster weight for each Zinfandel selection. An additional 100 berries were randomly gathered from the same data vines and put in the freezer for seed count, phenolic extrac- tion and HPLC analysis at a later time. In March 2014, pruning weights were collected from the same data vines to generate an average pruning weight per selection. On March 21, 2014, the buds were examined to determine if any of the W I N E G R O W I N G PHOTO BY MICHAEL PENN Heritage Zinfandel selection 89 was selected from an El Dorado County vineyard. The Palace Hotel San Francisco AUGUST 16 1-5 Trade 2:30-5 Public To attend: www.familywinemakers.org Great Wine A Family Tradition Family Winemakers Anniversary Tasting