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Article

Timing of Shoot Thinning in Vitis vinifera: Impacts on Yield and Fruit Composition Variables

Andrew G. Reynolds, Tony Molek, Christiane De Savigny
Am J Enol Vitic. December 2005 56: 343-356; published ahead of print December 01, 2005 ; DOI: 10.5344/ajev.2005.56.4.343
Andrew G. Reynolds
1Professor of viticulture, 2Undergraduate thesis student, and 3Technician, Cool Climate Oenology and Viticulture Institute, Brock University, St. Catharines, ON, Canada L2S 3A1.
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  • For correspondence: areynold@brocku.ca
Tony Molek
1Professor of viticulture, 2Undergraduate thesis student, and 3Technician, Cool Climate Oenology and Viticulture Institute, Brock University, St. Catharines, ON, Canada L2S 3A1.
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Christiane De Savigny
1Professor of viticulture, 2Undergraduate thesis student, and 3Technician, Cool Climate Oenology and Viticulture Institute, Brock University, St. Catharines, ON, Canada L2S 3A1.
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Abstract

Many growers in the Niagara Peninsula of Ontario are reluctant to use canopy division to address high vigor in their vineyards. An alternative approach of delayed shoot thinning was explored. Pinot noir and Cabernet franc vines in Ontario were subjected to six different shoot-thinning timings, based on the Eichhorn and Lorenz phenological stages 9 to 31, during the 2001 and 2002 seasons. An additional double-prune treatment (retaining four canes at dormant pruning and removing two at fruit set) was imposed on Cabernet franc. Minor differences between treatments were observed in 2001 and 2002 with respect to yield, periderm formation, and vine size. However, the study was carried out primarily to assess the impact of these treatments on berry, must, and wine composition and canopy microclimate. Early shoot-thinning treatments on Pinot noir resulted in increased titratable acidity (TA) and soluble solids in berries and must. Early shoot-thinning treatments on Cabernet franc generally resulted in higher soluble solids and color intensity in berries, lower TA in musts, and higher color intensity, total phenolics, and total anthocyanins in wines. The double-prune treatment was characterized by higher soluble solids, hue/tint, color intensity, and total phenolics overall. Canopy assessment showed that treatments imposed after bloom produced lower leaf layer numbers and better leaf and cluster exposure than did the control and early shoot thinning, especially in Cabernet franc. Early shoot-thinning treatments induced higher leaf areas in both cultivars compared to later treatments. Double pruning resulted in lower leaf layer numbers and better leaf exposure and had no impact on mean leaf area or photosynthetic photon flux density. Despite reductions in canopy density, delayed shoot thinning appeared to lead to concomitant delays in fruit maturity in terms of soluble solids, anthocyanins, and phenolics.

  • anthocyanins
  • Cabernet franc
  • fruit composition
  • phenolics
  • Pinot noir
  • sensory analysis
  • Received March 2005.
  • Revision received June 2005.
  • Copyright © 2005 by the American Society for Enology and Viticulture
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Vol 56 Issue 4

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Timing of Shoot Thinning in Vitis vinifera: Impacts on Yield and Fruit Composition Variables
Andrew G. Reynolds, Tony Molek, Christiane De Savigny
Am J Enol Vitic.  December 2005  56: 343-356;  published ahead of print December 01, 2005 ; DOI: 10.5344/ajev.2005.56.4.343

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Timing of Shoot Thinning in Vitis vinifera: Impacts on Yield and Fruit Composition Variables
Andrew G. Reynolds, Tony Molek, Christiane De Savigny
Am J Enol Vitic.  December 2005  56: 343-356;  published ahead of print December 01, 2005 ; DOI: 10.5344/ajev.2005.56.4.343
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