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Research Article

Postponing First Shoot Topping Reduces Grape Cluster Compactness and Delays Bunch Rot Epidemic

Daniel Molitor, Nicole Baron, Timo Sauerwein, Christelle M. André, Anna Kicherer, Johanna Döring, Manfred Stoll, Marco Beyer, Lucien Hoffmann, Danièle Evers
Am J Enol Vitic. May 2015 66: 164-176; published ahead of print December 12, 2014 ; DOI: 10.5344/ajev.2014.14052
Daniel Molitor
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
2University of Natural Resources and Life Sciences, Dept. of Crop Sciences, Div. of Viticulture and Pomology, Konrad Lorenz Str. 24, A-3430 Tulln, Austria;
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  • For correspondence: daniel.molitor@list.lu
Nicole Baron
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
3Hochschule Geisenheim University, Institute of General and Organic Viticulture, Blaubachstrasse 19, D-65366 Geisenheim, Germany
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Timo Sauerwein
3Hochschule Geisenheim University, Institute of General and Organic Viticulture, Blaubachstrasse 19, D-65366 Geisenheim, Germany
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Christelle M. André
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
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Anna Kicherer
4JKI – Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Institute for Grapevine Breeding Geilweilerhof, Geilweilerhof, D-76833 Siebeldingen, Germany
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Johanna Döring
3Hochschule Geisenheim University, Institute of General and Organic Viticulture, Blaubachstrasse 19, D-65366 Geisenheim, Germany
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Manfred Stoll
3Hochschule Geisenheim University, Institute of General and Organic Viticulture, Blaubachstrasse 19, D-65366 Geisenheim, Germany
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Marco Beyer
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
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Lucien Hoffmann
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
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Danièle Evers
1Centre de Recherche Public – Gabriel Lippmann, Department Environment and Agro-biotechnologies (EVA), 41, rue du Brill, L-4422 Belvaux, Luxembourg;
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Abstract

Field trials investigating the impact of the timing of first shoot topping in a vertical shoot positioning (VSP) trellis system on (i) the cluster morphology, (ii) the canopy structure in the cluster-zone, and (iii) the progress of the bunch rot disease severity, were conducted in two white Vitis vinifera (Pinot gris, Riesling) cultivars in the years 2012 and 2013 in Luxembourg. The first shoot topping was carried out at seven different times from one week prior to beginning of flowering (BBCH 57) to four weeks after the end of flowering (BBCH 75–79) at approximately weekly intervals. Late first shoot topping reduced cluster compactness, delayed bunch rot epidemics, and thereby prolonged the potential ripening period compared to the standard treatment, in which the first shoot topping was performed one week postbloom. First shoot topping four weeks postbloom delayed the moment when 5% disease severity was reached up to eleven days and increased total soluble solids by 0.77 to 2.24 Brix compared to the standard treatment, with no significant impact on yield. Postponing the first shoot topping to the latest technically possible moment is recommended to improve grape architecture and health as well as to optimize grape maturity and potential wine quality under cool climate conditions. Late first shoot topping can be implemented in bunch rot control strategies without imposing additional costs and might support the reduction of pesticide use.

  • Botrytis cinerea
  • bunch rot
  • cluster architecture
  • crop cultural practice
  • maturation benefit
  • pesticide reduction
  • shoot topping
  • vineyard management
  • Received May 2014.
  • Revision received August 2014.
  • Revision received November 2014.
  • Accepted November 2014.
  • ©2015 by the American Society for Enology and Viticulture
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Postponing First Shoot Topping Reduces Grape Cluster Compactness and Delays Bunch Rot Epidemic
Daniel Molitor, Nicole Baron, Timo Sauerwein, Christelle M. André, Anna Kicherer, Johanna Döring, Manfred Stoll, Marco Beyer, Lucien Hoffmann, Danièle Evers
Am J Enol Vitic.  May 2015  66: 164-176;  published ahead of print December 12, 2014 ; DOI: 10.5344/ajev.2014.14052

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Postponing First Shoot Topping Reduces Grape Cluster Compactness and Delays Bunch Rot Epidemic
Daniel Molitor, Nicole Baron, Timo Sauerwein, Christelle M. André, Anna Kicherer, Johanna Döring, Manfred Stoll, Marco Beyer, Lucien Hoffmann, Danièle Evers
Am J Enol Vitic.  May 2015  66: 164-176;  published ahead of print December 12, 2014 ; DOI: 10.5344/ajev.2014.14052
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