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February 2015 practical winery & vineyard 57 G R A P E G R O W I N G berry composition at harvest, 2 which is desirable in some but not all wine styles. An increase or decrease in gross profit per vine is further compounded by the number of vines being pruned. The accuracy and attention to detail of the pruning team will ultimately deter- mine what canes are being selected. It increase in gross profit, however, the vines may be unable to ripen the addi- tional fruit to desired parameters. Selecting thicker canes will result in a greater proportion of inflorescence with an outer arm. While the presence of an outer arm will increase yield, it may cause an increase in the variability of the importance of yield prediction tools. Therefore, temperature will, in part, determine the extent that cane selection is able to manipulate yield. The decision to manipulate yield through cane selection will depend on production requirements. Selecting larger diameter canes may result in an -$4.00 -$3.00 -$2.00 -$1.00 $0.00 $1.00 $2.00 $3.00 $4.00 0.30 0.35 0.40 0.45 0.50 0.55 0.60 500 1,000 1,500 2,000 2,500 3,000 3,500 Change in gross profit per vine Cane diameter (inch) $/ton Figure 2. The effect of cane diameter and the value of grapes (dollars per ton) on the increase or decrease in gross profit per vine relative to the three- year average cane diameter left after pruning (0.43 inch). Gross profit and dollars per ton values were calculated from the relationship of cane diameter compared to inflorescence number along a cane (2011–2012 data). Cane diameter (inch) 0.35 0.40 0.45 0.50 0.55 $/ton 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 -4 -3 -2 -1 0 1 2 3 Change in gross profit/vine ($) Wasco 661-758-4777 Paso Robles 805-237-8914 Modesto 209-523-8036 santa Rosa 707-542-5510 serving the Wine, table Grape and Raisin Industries Great ideas are only as good as their execution. and Vintage nurseries innovation has proven itself, over and over again. We listened to our growers who we consider our partners, and responded by doubling our mist propagation system, quadrupling our lighthouse capacity, and installing a new water reclamation system and higher volume shadehouse structure. as always, Vintage also continues to lead the way in technology that combats industry-wide pests and pathogens. our goal is to keep striving to provide optimum growing conditions and superior quality products for our growing partners. Tat comes through innovation, day after day. It's what we do best, and it's just the beginning for many more exciting innovations to come. www.Vintagenurseries.com | 800-499-9019 | Bold Innovation. Vintage Quality New ShadehouSe FacilitieS updated GreeNhouSe FacilitieS expaNded liGhthouSe capacity New MiSt propaGatioN Facility water reclaMatioN SySteM