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56 practical winery & vineyard February 2015 G R A P E G R O W I N G Conclusions The influence of cane diameter on inflo- rescence number and architecture per shoot along a cane was investigated. Cane diameter is an indication of the average inflorescence number and structure along a cane, thereby influencing gross return. The results indicate that viticulturists can manipulate yield as early as pruning through cane selection. Temperatures during inflorescence primordia initia- tion, however, have a major influence on the inflorescence number per bud, 5 and thus the subsequent shoot, highlighting Renewal spur Four-cane Sauvignon Blanc vineyard in Marlborough, New Zealand. Vine spacing: 1.8 meters between the vines and 2.4 meters between vine rows. Renewal spurs are circled in red. The number of renewal spurs retained during pruning is dependent on individual vine requirements and pruning preferences. Cane Yield Change in Diameter (kg/vine) gross profit (inch) 2011–12 2012–13 2011–12 2012–13 0.31 5.7 4.2 -15% -18% 0.36 6.1 4.5 -9% -11% 0.38 6.3 4.8 -6% -6% 0.41 6.5 5.0 -3% -2% 0.43 6.7 5.2 0% 0% 0.46 6.9 5.3 3% 5% 0.48 7.1 5.5 5% 9% 0.52 7.4 5.8 9% 14% 0.54 7.5 6.0 12% 18% 0.56 7.6 6.1 13% 19% *Change in gross profits were compared to the three- year average cane diameter le a er pruning (0.43 inch). Table 1. The influence of Cane Diameter on Gross Profit PHOTOS COURTESY OF THE NEW ZEAlANd INSTITUTE FOR PlANT & FOOd RESEARCH lImITEd