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Research Report

Gibberellic Acid for Table Grape Inflorescence Elongation: Is It Worth It?

M. Cecilia Peppi, Edgard Álvarez
Am J Enol Vitic.  2023 74: 0740012 ; DOI: 10.5344/ajev.2022.22003
M. Cecilia Peppi
1Agronomical Practices for Fruit Trees and Grapevines, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile;
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  • For correspondence: cecilia.peppi@inia.cl
Edgard Álvarez
2Postharvest, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile.
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Abstract

Background and goals Gibberellic acid (GA3) is sometimes used at prebloom to help control cluster compactness, but controversy has been raised regarding its efficacy, particularly in table grape production. A trial was established to evaluate prebloom GA3 on rachis length.

Methods and key findings In GA3-treated and untreated clusters, rachises were divided into three arbitrary segments. The increase in length of each segment was evaluated from a month before bloom until the beginning of summer. Prebloom GA3 rapidly triggered rachis growth in length, but only in the middle and distal portions of the inflorescence. The top area was not affected. The standard table grape cluster tipping that followed eliminated the cluster distal portion and all GA3 related rachis growth. GA3-treated clusters had longer segments removed compared to untreated ones. Shot berries and rachis thickness were also increased, but cluster and berry weight remained the same.

Conclusions and significance The effects of GA3 on rachis length at prebloom can be discarded by other required standard table grape practices. The negative and cumulative effects should be considered when analyzing its usefulness. Knowing the benefits and disadvantages of this practice will help table grape growers to optimize plant growth regulator programs.

  • cluster structure
  • prebloom
  • thinning
  • tipping
  • viticultural practice
  • Received April 2022.
  • Accepted November 2022.
  • Published online March 2023
  • Copyright © 2023 by the American Society for Enology and Viticulture. All rights reserved.
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Gibberellic Acid for Table Grape Inflorescence Elongation: Is It Worth It?
M. Cecilia Peppi, Edgard Álvarez
Am J Enol Vitic.  2023  74: 0740012  ; DOI: 10.5344/ajev.2022.22003
M. Cecilia Peppi
1Agronomical Practices for Fruit Trees and Grapevines, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile;
  • Find this author on Google Scholar
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  • For correspondence: cecilia.peppi@inia.cl
Edgard Álvarez
2Postharvest, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile.
  • Find this author on Google Scholar
  • Find this author on PubMed
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Gibberellic Acid for Table Grape Inflorescence Elongation: Is It Worth It?
M. Cecilia Peppi, Edgard Álvarez
Am J Enol Vitic.  2023  74: 0740012  ; DOI: 10.5344/ajev.2022.22003
M. Cecilia Peppi
1Agronomical Practices for Fruit Trees and Grapevines, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: cecilia.peppi@inia.cl
Edgard Álvarez
2Postharvest, Instituto de Investigaciones Agropecuarias, INIA La Platina, Av. Santa Rosa 11610, La Pintana, Chile.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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