Abstract
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 GA 3 for berry thinning. In the first experiment, vines were treated with 2 g·ha -1 GA 3 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 GA 3 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 GA 3 , 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 GA 3 applied at bloom increased. Applications ≥6.25 g·ha -1 GA 3 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 GA 3 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 (GA 3 ).
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Claims 8
Claim · model-written summary
Fruit set was similar among vines treated with 2 g/ha GA3 at any bloom stage from 1-5% to 100% bloom.
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“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 GA 3 , although berry set was reduced relative to the control”
Claim · model-written summary
Berry set was reduced by 2 g/ha GA3 applied at bloom relative to the control.
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“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 GA 3 , although berry set was reduced relative to the control”
Claim · model-written summary
GA3 applications made during the later stages of bloom significantly increased berry length and weight.
- Taxon
- Table Grapest0
- Treatment
- applications made during the later stages of bloome0
- Outcome
- berry length and weighte0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“applications made during the later stages of bloom significantly increased berry length and weight”
Claim · model-written summary
Fruit set generally declined as the amount of GA3 applied at bloom increased.
Not reportedComparator
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“Fruit set generally declined, and the number of shot berries per cluster increased, as the amount of GA 3 applied at bloom increased”
Claim · model-written summary
The number of shot berries per cluster increased as the amount of GA3 applied at bloom increased.
- Taxon
- Table Grapest0
- Treatment
- amount of GA 3 applied at bloome0
- Outcome
- number of shot berries per clustere0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“Fruit set generally declined, and the number of shot berries per cluster increased, as the amount of GA 3 applied at bloom increased”
Claim · model-written summary
Applications of 6.25 g/ha GA3 or more resulted in commercially unacceptable levels of shot berries.
- Taxon
- Table Grapest0
- Treatment
- Applications ≥6.25 g·ha -1 GA 3e0
- Outcome
- levels of shot berriese0
- Direction
- increaseinferrede0
- Qualifier
- commercially unacceptablee0
Not reportedComparator
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“Applications ≥6.25 g·ha -1 GA 3 resulted in commercially unacceptable levels of shot berries, as well as significant reductions in cluster weight and packable yield per vine”
Claim · model-written summary
Applications of 6.25 g/ha GA3 or more significantly reduced cluster weight and packable yield per vine.
- Taxon
- Table Grapest0
- Treatment
- Applications ≥6.25 g·ha -1 GA 3e0
- Outcome
- cluster weight and packable yield per vinee0
- Direction
- reductionse0
Not reportedComparator
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“Applications ≥6.25 g·ha -1 GA 3 resulted in commercially unacceptable levels of shot berries, as well as significant reductions in cluster weight and packable yield per vine”
Claim · model-written summary
The authors conclude that a single application of 2.5 g/ha GA3 near full bloom may be used to reduce fruit set and increase berry size without detrimental effects on packable yield or cluster number per vine the next year.
Verbatim
t0“'Crimson Seedless' Table Grapes”
e0“a single application of 2.5 g·ha -1 GA 3 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”
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