Technical Report
 

Evaluation of Pinot noir and Chardonnay Clones, 1993 Season

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  • We harvested the first significant crop from the Woodhall clonal trials in 1993. Early results from clonal trials can be misleading but there are differences between clones that are already quite apparent in some cases. Many of the clone types could be readily identified this season by plant growth habit (upright vs. prostrate) and cluster morphology (large and loose cluster types). Clones were more difficult to distinguish within the Pinot fin group of small clustered, prostrate types but in some cases there appeared to be differences in leaf characteristics. We visually rated the clones after set and at first color. UCD 2A, the Wadensville clone, appeared to be the most sensitive clone in the trial to inflorescence necrosis with distinct necrosis symptoms in all four replicates. Many of the clones had no necrosis symptoms. Three clones had earlier color development at veraison: UCD 4 (Pommard), Dijon 115, and Dijon 10/18. Cluster weights were small ranging from 43 to 86 grams with Dijon clones 113, 114, and 115, and UCD 29 having the smallest cluster weights in the trial. UCD 2A, 23, and 17, and Dijon 115 had the highest 'Brix in the trial and clones Dijon 114 and 115 had the lowest TA. Wines were made from only a few of the clones in 1993 (UCD 2A, 4, and 17 and Dijon 113, 114, and 115)(see Evaluation of Winegrapes). This was the first good look we have had at the Dijon clones. These clones have been extensively evaluated in France and their performance under French conditions is well documented. It was reassuring to see that the French descriptions generally held for their performance under Oregon conditions. Pinot noir clones 113, 114 and 115 generally had small clusters and appeared to be typical Pinot fin types. Several of our earlier French introductions were large clustered, very productive types. It will take several years to determine how the Dijon clones compare to the material already planted in Oregon, but the information from France win be very useful in the evaluation process. Chardonnay clones appeared to have more similar plant growth habits and leaf and cluster characteristics than the Pinot noir clones, but there were distinct differences in fruit maturity. Clones UCD 4 and 5, the "108" clones that are widely planted in Oregon, appeared to be later than most of the other clones. They had the largest clusters and the highest yields, which may have contributed some to their late maturity. As an example UCD 4 had 22.6 -Brix, 9.34 TA, and 2.96 pH compared to 24.0 'Brix, 6.11 TA, and 3.10 pH for Dijon 96. The other Dijon clones were similar to 96 as were clones ESP 352. Wines were made from the Dijon clones, UCD 4, and ESP 352. These were promising results. If these differences hold up in the coming years, these clones will offer a considerable improvement over the 108 clones.
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