VITICULTURAL PERFORMANCE OF 7 CABERNET-SAUVIGNON CLONES IN THE NORTHERN SAN-JOAQUIN VALLEY, CALIFORNIA

Seven Cabernet Sauvignon clones from Foundation Plant Materials Servic e (FPMS), University of California, were evaluated over a three-year p eriod in the Lodi-Woodbridge District of the northern San Joaquin Vall ey, California. FPMS 2, 4, 5, 6, 8, 10, and 21 were all certified viru s-tested. FPMS 6 had the greatest pruning weight (2.8 kg vine(-1)) whi le FPMS 8 and 10 had the least (2.0 and 1.9 kg vine(-1), respectively) . FPMS 6 had the lowest average yield (7.0 kg vine(-1)) while FPMS 21 had the highest average yield (9.7 kg vine(-1)). Vine yield was highly correlated (r(2) = 0.96) with cluster weight while cluster numbers di d not differ. Contributions to cluster weight were made by both berrie s per cluster and berry weight. Despite yield differences of 2.7 kg vi ne(-1), average (degrees)Brix varied by only 1.2 degrees. Titratable a cidity and pH differences were negligible.