Volume 60 Number 4 Article 24
Year 2006 Month 10
Title: Exogenously Applied Abscisic Acid Did Not Consistently Delay Budburst of Deacclimating Grapevines
Authors: E. Hellman, S. Shelby and C. Lowery
Abstract:
An experimental formulation of abscisic acid (ABA; Valent Biosciences VBC-30025) was evaluated for potential
to delay budburst of Vitis vinifera L. winegrapes.
Five experiments were conducted during 2004 and 2005
on dormant grapevine cuttings, container-grown vines, and field-grown vines to evaluate rates and/or timing of
ABA applications.
Two application methods were tested – spray application to buds or soil application.
Spray
application of ABA solutions to unopened buds increased the number of days to budburst by 3.5 days in one of
four laboratory trials on single-bud cuttings, and delayed budburst by one day in established field-grown vines in
one of two years.
Further study to enhance the efficacy of ABA spray applications should examine materials or
methods to improve penetration of ABA through bud scales.
Soil applications of ABA to container-grown vines
provided the greatest delay in budburst (up to 7 days) and gave the most consistent response.
Soil application of
ABA to established field-grown vines, however, produced no response and this may not be a practical or economical
application method for commercial vineyards.
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