Skip to main content
Advertisement

Main menu

  • Home
  • Content
    • Current Volume
    • AJEV and Catalyst Archive
    • Best Papers
    • ASEV National Conference Technical Abstracts
    • Print on Demand
  • Information For
    • Authors
    • Open Access Publishing
    • AJEV Preprint and AI Software Policy
    • Submission
    • Subscribers
      • Proprietary Rights Notice for AJEV Online
    • Permissions and Reproductions
  • About Us
  • Feedback
  • Alerts
  • Help
  • Login
  • ASEV MEMBER LOGIN

User menu

  • Log in

Search

  • Advanced search
American Journal of Enology and Viticulture
  • Log in
  • Follow ajev on Twitter
  • Follow ajev on Linkedin
American Journal of Enology and Viticulture

Advanced Search

  • Home
  • Content
    • Current Volume
    • AJEV and Catalyst Archive
    • Best Papers
    • ASEV National Conference Technical Abstracts
    • Print on Demand
  • Information For
    • Authors
    • Open Access Publishing
    • AJEV Preprint and AI Software Policy
    • Submission
    • Subscribers
    • Permissions and Reproductions
  • About Us
  • Feedback
  • Alerts
  • Help
  • Login
  • ASEV MEMBER LOGIN
Research Article

Autonomous Phenological Development in Different Merlot Grapevine Shoots

Michael J. Sipiora, Amanda Cihlar, Samantha Abbate, Whitney Coker, Jackie Harris, Will Drayton
Am J Enol Vitic.  2022  73: 237-246  ; DOI: 10.5344/ajev.2022.21033
Michael J. Sipiora
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
  • For correspondence: michael.sipiora@tweglobal.com
Amanda Cihlar
2Stagecoach Vineyards Napa, CA 94559;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
Samantha Abbate
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
Whitney Coker
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
Jackie Harris
3E&J Gallo Winery, Acampo, CA 95220.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
Will Drayton
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
  • Article
  • Figures & Data
  • Info & Metrics
  • PDF
Loading

Abstract

The common viticulture practice called “green thinning,” performed to improve uniformity of ripeness, is based on an underlying assumption that shoots (and their respective clusters) on the same grapevine are phenologically autonomous. There is no empirical evidence to support this assumption. The theory of phenological shoot autonomy in grapevines was tested over three seasons in three different Merlot vineyards located in Napa Valley. A trial was established comparing early pruning versus late pruning of spurs on separate vines or applied to the same vine in two forms: opposite cordons on the same vine or alternate spurs on the same vine. Phenological stages were followed on shoots from one vine per replicate for each treatment combination using an updated Eichhorn-Lorenz (E-L) scale from budbreak to end of veraison. The ordinal logistic regression analysis of the median phenological stages for all seasons revealed an effect of pruning date, but not pruning unit. Budbreak was delayed by 10 days the first season, by seven to nine days the second season, and between 10 and 13 days in 2020 with late pruning. Veraison was delayed five to eight days each season with late pruning on both separate vines and same vine treatments. The analysis of fruit composition three to five weeks after veraison was complete (E-L 41) also showed a lower Brix with late pruning on separate vines or the same vine, and that there was no interaction between pruning date and pruning unit in any vintages. Overall, the results support the phenological shoot autonomy theory in grapevines.

  • autonomy
  • Eichhorn-Lorenz
  • grapevine
  • phenology
  • variability
  • Received July 2021.
  • Revision received November 2021.
  • Revision received January 2022.
  • Revision received April 2022.
  • Accepted May 2022.
  • Published online November 2022
  • Copyright © 2022 by the American Society for Enology and Viticulture. All rights reserved.
View Full Text

Sign in for ASEV members

ASEV Members, please sign in at ASEV to access the journal online.

Sign in for Institutional and Non-member Subscribers

Log in using your username and password

Forgot your user name or password?

Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00

Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.

Forgot your user name or password?

PreviousNext
Back to top

Vol 73 Issue 4

Issue Cover
  • Table of Contents
  • Table of Contents (PDF)
  • About the Cover
  • Index by author
View full PDF
Email Article

Thank you for your interest in spreading the word on AJEV.

NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.

Enter multiple addresses on separate lines or separate them with commas.
Autonomous Phenological Development in Different Merlot Grapevine Shoots
(Your Name) has forwarded a page to you from AJEV
(Your Name) thought you would like to read this article from the American Journal of Enology and Viticulture.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Citation Tools
You have accessRestricted access
Autonomous Phenological Development in Different Merlot Grapevine Shoots
Michael J. Sipiora, Amanda Cihlar, Samantha Abbate, Whitney Coker, Jackie Harris, Will Drayton
Am J Enol Vitic.  2022  73: 237-246  ; DOI: 10.5344/ajev.2022.21033
Michael J. Sipiora
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: michael.sipiora@tweglobal.com
Amanda Cihlar
2Stagecoach Vineyards Napa, CA 94559;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Samantha Abbate
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Whitney Coker
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jackie Harris
3E&J Gallo Winery, Acampo, CA 95220.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Will Drayton
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero

Share
You have accessRestricted access
Autonomous Phenological Development in Different Merlot Grapevine Shoots
Michael J. Sipiora, Amanda Cihlar, Samantha Abbate, Whitney Coker, Jackie Harris, Will Drayton
Am J Enol Vitic.  2022  73: 237-246  ; DOI: 10.5344/ajev.2022.21033
Michael J. Sipiora
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: michael.sipiora@tweglobal.com
Amanda Cihlar
2Stagecoach Vineyards Napa, CA 94559;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Samantha Abbate
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Whitney Coker
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jackie Harris
3E&J Gallo Winery, Acampo, CA 95220.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Will Drayton
1Treasury Wine Estates – Napa, 1000 Pratt Avenue, St. Helena, CA 94574;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
del.icio.us logo Twitter logo Facebook logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One
Save to my folders

Jump to section

  • Article
    • Abstract
    • Materials and Methods
    • Results
    • Discussion
    • Conclusion
    • Footnotes
    • Literature Cited
  • Figures & Data
  • Info & Metrics
  • PDF

Related Articles

Cited By...

More from this TOC section

  • Diversity of Wild Yeasts During Spontaneous Fermentation of Wines from Local Grape Varieties in Turkey
  • Bioprotective Effect of Pichia kluyveri and Lactiplantibacillus plantarum in Winemaking Conditions
  • Vine Age Affects Vine Performance, Grape and Wine Chemical and Sensory Composition of cv. Zinfandel from California
Show more Research Articles

Similar Articles

AJEV Content

  • Current Volume
  • Archive
  • Best Papers
  • ASEV National Conference Technical Abstracts
  • Print on Demand

Information For

  • Authors
  • Open Access Publishing
  • AJEV Preprint and AI Software Policy
  • Submission
  • Subscribers
  • Permissions and Reproductions

Other

  • Home
  • About Us
  • Feedback
  • Help
  • Alerts
  • ASEV
asev.org

© 2025 American Society for Enology and Viticulture.  ISSN 0002-9254.

Powered by HighWire