Mechanical yield regulation in winegrapes: Comparison of early defoliation and crop thinning

  1. Tardaguila, J. 13
  2. Blanco, J.A. 1
  3. Poni, S. 2
  4. Diago, M.P. 1
  1. 1 Instituto de Ciencias de la Vid y del Vino

    Instituto de Ciencias de la Vid y del Vino

    Logroño, España

    GRID grid.481584.4

  2. 2 Istituto di Frutti-Viticoltura, Via Emilia Parmense 84, Piacenza 29100, Italy
  3. 3 Universidad de La Rioja

    Universidad de La Rioja

    Logroño, España

    GRID grid.119021.a

Australian Journal of Grape and Wine Research

ISSN: 1322-7130

Year of publication: 2012

Volume: 18

Issue: 3

Pages: 344-352

Type: Article

Export: RIS
DOI: 10.1111/j.1755-0238.2012.00197.x SCOPUS: 2-s2.0-84866773106 WoS: 000309063700010 GOOGLE SCHOLAR


Cited by

  • Scopus Cited by: 33 (14-07-2021)

Journal Citation Reports

  • Year 2012
  • Journal Impact Factor: 2.958
  • Best Quartile: Q1
  • Area: FOOD SCIENCE & TECHNOLOGY Quartile: Q1 Rank in area: 14/124 (Ranking edition: SCIE)
  • Area: HORTICULTURE Quartile: Q1 Rank in area: 3/32 (Ranking edition: SCIE)

SCImago Journal Rank

  • Year 2012
  • SJR Journal Impact: 1.92
  • Best Quartile: Q1
  • Area: Horticulture Quartile: Q1 Rank in area: 1/76


  • Year 2012
  • CiteScore of the Journal : 4.8
  • Area: Horticulture Percentile: 94

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Background and Aims: Winter pruning and manual bunch thinning are the primary methods for crop regulation in viticulture. Recently, innovative mechanical approaches have been proposed as cost-effective for yield management. The aim of this work was to compare the effectiveness of mechanical early defoliation and mechanical crop thinning on yield regulation, and on grape and wine composition. Methods and Results: The impact of mechanical early defoliation and crop thinning, applied at different timings, was investigated in Vitis vinifera L. cv. Tempranillo vertically shoot-positioned-trained grapevines over two seasons. Effects on yield components, leaf area, botrytis incidence, grape and wine composition were determined. Yield per vine was drastically reduced by both techniques (35-40%). Bunch weight, number of berries per bunch, bunch compactness and botrytis were also reduced by most of the treatments. Total leaf area per vine was not affected, however, the total leaf area-to-yield ratio increased in most cases. Berry soluble solids, anthocyanins and total phenols increased in the grapes. Wines were higher in alcohol and more intensely coloured in mechanical early defoliation treatments in comparison with those of mechanical thinning. Conclusions: Mechanical early defoliation and crop thinning may be suitable and efficient for regulating grape yield and improving grape and wine composition. Early defoliation, however, appeared to be more consistent. Significance of the Study: Effective yield control in winegrapes may be accomplished by mechanical techniques implemented between pre-flowering and veraison. The choice of mechanical technique for yield management may influence the grape and wine composition. © 2012 Australian Society of Viticulture and Oenology Inc.