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Article

Impact of Early Leaf Removal on Yield and Fruit and Wine Composition of Vitis vinifera L. Graciano and Carignan

Javier Tardaguila, Fernando Martinez de Toda, Stefano Poni, Maria P. Diago
Am J Enol Vitic.  2010  61: 372-381  ; DOI: 10.5344/ajev.2010.61.3.372
Javier Tardaguila
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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  • For correspondence: javier.tardaguila@unirioja.es
Fernando Martinez de Toda
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Stefano Poni
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Maria P. Diago
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Abstract

Early defoliation is a novel cultural practice for crop management in grapevines. The effects of timing (prebloom or fruit set) and method (manual or mechanical) of early defoliation on yield and grape and wine composition of Vitis vinifera L. cv. Graciano and Carignan grapevines were investigated. Leaf removal induced a substantial increase in both cluster exposure and canopy porosity. Yield was significantly reduced by defoliation in both varieties. Yield per shoot was reduced between 30 and 70% by manual and mechanical leaf removal prebloom. In both varieties, postflowering leaf removal was ineffective at modifying fruit set, number of berries per cluster, or yield per shoot. Botrytis incidence was also reduced by leaf removal. Prebloom defoliation allowed full recovery of the leaf:fruit ratios to that seen in nondefoliated vines. Grape soluble solids and wine alcohol concentration were not affected by defoliation. Malic acid decreased with leaf removal at fruit set. Genotype-environment interactions on berry acidity variables such as titratable acidity and tartaric acid concentrations were found. Early leaf removal substantially increased anthocyanin and phenol concentration in grapes and wine of both varieties. In Carignan, early leaf removal resulted in heavier berries, which nevertheless had enhanced grape and wine color. These results support the hypothesis that in early-defoliated vines, the relative growth of various berry organs is affected independently from absolute berry mass. Mechanical early defoliation has the potential to be a cost-effective technique to control yield and to improve grape and wine composition.

  • early defoliation
  • mechanization
  • yield
  • grape composition
  • anthocyanins
  • phenols
  • Received August 2009.
  • Revision received December 2009.
  • Revision received March 2010.
  • Accepted April 2010.
  • Published online September 2010
  • Copyright © 2010 by the American Society for Enology and Viticulture
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Impact of Early Leaf Removal on Yield and Fruit and Wine Composition of Vitis vinifera L. Graciano and Carignan
Javier Tardaguila, Fernando Martinez de Toda, Stefano Poni, Maria P. Diago
Am J Enol Vitic.  2010  61: 372-381  ; DOI: 10.5344/ajev.2010.61.3.372
Javier Tardaguila
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Fernando Martinez de Toda
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Stefano Poni
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Maria P. Diago
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Impact of Early Leaf Removal on Yield and Fruit and Wine Composition of Vitis vinifera L. Graciano and Carignan
Javier Tardaguila, Fernando Martinez de Toda, Stefano Poni, Maria P. Diago
Am J Enol Vitic.  2010  61: 372-381  ; DOI: 10.5344/ajev.2010.61.3.372
Javier Tardaguila
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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  • For correspondence: javier.tardaguila@unirioja.es
Fernando Martinez de Toda
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Stefano Poni
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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Maria P. Diago
1Instituto de Ciencias de la Vid y del Vino (Universidad de La Rioja, CSIC, Gobierno de La Rioja), Madre de Dios, 51, 26006 Logroño, Spain; 2Istituto di Frutti-Viticoltura, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, Piacenza, 29100, Italy.
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