TY - JOUR T1 - Performance of Zinfandel and Primitivo Clones in a Warm Climate JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 124 LP - 126 DO - 10.5344/ajev.1996.47.2.124 VL - 47 IS - 2 AU - James A. Wolpert Y1 - 1996/01/01 UR - http://www.ajevonline.org/content/47/2/124.abstract N2 - Four clones of Zinfandel and one clone of Primitivo, all certified virus-tested, were compared in a warm, Region V, climate over a five-year period. Few significant differences were found among Zinfandel clones; however, Primitivo differed substantially from Zinfandel. Despite having significantly more clusters per vine, Primitivo had 15% lower yield due both to 14% fewer berries per cluster and 11% smaller berries. Primitivo's 10% heavier pruning weight and advanced maturity (about 1 °Brix) could both be accounted for by its lower yield per vine. ER -