Gibberellic Acid Applied at Bloom Reduces Fruit Set and Improves Size of 'Crimson Seedless' Table Grapes
By N. Dokoozlian, W. Peacock. 2001
91 citations recorded by the source corpus.
Excessive fruit set can reduce the quality of 'Crimson Seedless' table grapes (Vitis vinifera L.), resulting in compact, tightly filled clusters with small berries that are prone to bunch rot at harvest. Two separate studies were conducted to examine the effects of application timing and rate on the efficacy of GA3 for berry thinning. In the first experiment, vines were treated with 2 g·ha -1 GA3 at one of the following stages of bloom: 1% to 5%; 20% to 30%; 50% to 60%; 80% to 90%; or 100% capfall (falling of the calyptra). The second experiment compared treatments of 0, 2.5, 6.25, 12.5, 18.75, or 25 g·ha -1 GA3 applied at ≈80% bloom. Fruit set (number of berries/cm shoulder length) was similar among vines treated between 1% to 5% and 100% bloom with 2 g·ha -1 GA3, although berry set was reduced relative to the control. However, applications made during the later stages of bloom significantly increased berry length and weight. Fruit set generally declined, and the number of shot berries per cluster increased, as the amount of GA3 applied at bloom increased. Applications ≥6.25 g·ha -1 GA3 resulted in commercially unacceptable levels of shot berries, as well as significant reductions in cluster weight and packable yield per vine. The results indicate that a single application of 2.5 g·ha -1 GA3 near full bloom may be used to reduce fruit set and increase berry size of this cultivar without detrimental effects on packable yield or cluster number per vine the subsequent year. Chemical name used: gibberellic acid (GA3).
Subfields: Food Science, Plant Science
View Paper: https://www.semanticscholar.org/paper/035c30d7fd8df13cd86015e1e0d10afcfc44b4cb
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Citations in the corpus
- What do we know about grapevine bunch compactness? A state‐of‐the‐art review (2018, background): “Thus, Christodoulou et al. (1967) calculated bunch compactness as the number of berries per centimetre of rachis considering only the second and third branches of the bunch, Dokoozlian and Peacock (2001) considered the four first branches, and Lynn and Jensen (1966) all bunch branches.”
- Plant Growth Regulators: Backgrounds and Uses in Plant Production (2015, background): “For additional reading, see Dokoozlian and Peacock (2001) and Casanova and others (2009). Ethephon is a further important tool in the production of table grapes.”