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Research Article

Response of Fruit Growth and Ripening to Crop Level in Dry-Farmed Cabernet Sauvignon on Four Rootstocks

Vitale Nuzzo, Mark A. Matthews
Am J Enol Vitic. September 2006 57: 314-324; published ahead of print September 01, 2006 ; DOI: 10.5344/ajev.2006.57.3.314
Vitale Nuzzo
1Assistant professor, Universita’ degli Studi della Basilicata, Dipartimento di Scienze dei Sistemi Colturali, Forestali e dell’Ambiente, V. le Dell’Ateneo Lucano, 10, 85100 Potenza, Italy; 2Professor, Department of Viticulture and Enology, University of California, Davis, CA 95616.
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  • For correspondence: nuzzo@unibas.it
Mark A. Matthews
1Assistant professor, Universita’ degli Studi della Basilicata, Dipartimento di Scienze dei Sistemi Colturali, Forestali e dell’Ambiente, V. le Dell’Ateneo Lucano, 10, 85100 Potenza, Italy; 2Professor, Department of Viticulture and Enology, University of California, Davis, CA 95616.
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Abstract

An estimate of the amount of clusters that a vine can reasonably bring to maturity is essential for optimizing crop level. This work was conducted to determine whether the timing of maturity in a high-yielding, dry-farmed Vitis vinifera L. Cabernet Sauvignon vineyard could be manipulated through rootstocks and crop level. Cabernet Sauvignon, grafted on 5C Teleki (V. berlandieri Planch. x V. riparia Michx), 1103 Paulsen, 140 Ruggeri, and 110 Richter (V. berlandieri Planch. x V. rupestris Scheele), was used in a trial carried out in 1997 and 1998 in an 8-year-old vineyard near Oakville, California. Four levels of crop were imposed by winter pruning all vines to four-bud spurs and cluster thinning at veraison: treatment 1 (100%), or double crop, no thinned vines with ~26 shoots and 40 clusters per vine; treatment 2 (75%), in which 25% of clusters were thinned; treatment 3 (50%), the standard crop level in the study area or control, in which 50% of clusters were thinned and one cluster per shoot was retained; and treatment 4 (25%), in which 75% of clusters were thinned and one cluster every two shoots was retained. The time required to reach 23.5, 24.0, and 25.0 Brix was linearly dependent on crop level with a rate of about one day per each ton of grapes. Rootstocks and crop levels had no or little impact on fruitfulness, cluster and berry size, and final Brix. The reduction in sugar accumulation seems to be a sensitive measure for crop level and does not appear to be influenced by rootstock or environmental conditions.

  • berry growth
  • berry composition
  • yield
  • 1103 Paulsen
  • 140 Ruggeri
  • 110 Richter
  • 5C Teleki
  • Received June 2005.
  • Revision received March 2006.
  • Copyright © 2006 by the American Society for Enology and Viticulture
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Response of Fruit Growth and Ripening to Crop Level in Dry-Farmed Cabernet Sauvignon on Four Rootstocks
Vitale Nuzzo, Mark A. Matthews
Am J Enol Vitic.  September 2006  57: 314-324;  published ahead of print September 01, 2006 ; DOI: 10.5344/ajev.2006.57.3.314

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Response of Fruit Growth and Ripening to Crop Level in Dry-Farmed Cabernet Sauvignon on Four Rootstocks
Vitale Nuzzo, Mark A. Matthews
Am J Enol Vitic.  September 2006  57: 314-324;  published ahead of print September 01, 2006 ; DOI: 10.5344/ajev.2006.57.3.314
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