Abstract
Five grape cultivars pruned to 43 to 151 nodes per vine gave different yield responses. Chardonnay and Gewürztraminer had a linear relationship and doubling nodes doubled yield. A similar relationship appeared to occur initially with Cabernet Sauvignon, Müller Thurgau, and Sauvignon blanc, but diminishing response began to be manifested at approximately 40, 40 to 60, and 80 to 90 nodes per vine respectively. If more nodes were left on a vine at winter pruning, fewer formed shoots the following spring. While this was consistent for the five cultivars studied, some of these were still able to respond by increasing their yields in direct proportion to the higher node numbers. They did this by having more fruit on each shoot. It was discovered that the major contribution to this fruit increase was bunch number, although individual bunch weight made a small contribution.
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