Techniques to modify cluster architecture and their effect on the viticultural performance of the Sauvignon Blanc cultivar

Abstract: The objective of this work was to evaluate the effect of different techniques to modify grape cluster architecture on the incidence and severity of botrytis bunch rot, as well as on the viticultural performance of the 'Sauvignon Blanc' grapevine (Vitis vinifera). Associated with fungicides, four treatments were tested: control, 30 ppm gibberellic acid sprayed at full bloom, 1,000 ppm prohexadione calcium sprayed at full bloom, and berry thinning at the stage of beginning of berry touch. The experiment was carried out in the 2015, 2016, and 2017 vintages. Clusters were treated with fungicides during the stages of full bloom, beginning of berry touch, veraison, and around 15 days before harvest. Berry thinning does not cause losses in the yield and quality of 'Sauvignon Blanc', and, despite having little effect on cluster architecture, is effective in reducing the incidence and severity of Botrytis cinerea. Prohexadione calcium improves grape phenolic maturation, is effective in reducing the incidence and severity of B. cinerea, and reduces cluster compactness by decreasing berry diameter. The application of gibberellic acid spray at full bloom is not recommended because it decreases yield and bud fertility and increases berry susceptibility to B. cinerea infection.

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Influence of gibberellic acid and N6-benzyladenine on the development of seed and shot berries in the seedless grape (Vitis vinifera L.) cv. Perlette

Australian Journal of Agricultural Research ◽

10.1071/ar04202 ◽

2005 ◽

Vol 56 (5) ◽

pp. 497

Author(s):

K. Usha ◽

D. Kashyap ◽

B. Singh

Keyword(s):

Gibberellic Acid ◽

Fruit Set ◽

Vitis Vinifera L ◽

High Concentration ◽

Full Bloom ◽

Seed Formation ◽

Table Grapes ◽

Yield And Quality ◽

Seedless Grape

Gibberellins have been used to improve quality of grapes in several cases. However, gibberellic acid (GA) alone is not enough to improve the quality in Perlette. A field experiment was conducted on 3-year-old grape cv. Perlette trained on pergolas, to investigate the effect of bunch dipping with GA3 and N6-benzyladenine (BA) on reducing the problem of shot berries and improving the productivity of grapevines. Our observations proved that the stage of application of GA3 and BA is crucial to avoiding seed formation in seedless varieties such as Perlette for table grapes. The results showed that BA at low (10 µL/L) or high concentration (30 µL/L) at 50% of full bloom caused seed development in the seedless grape cv. Perlette, whereas no seed was formed when BA was used later at the fruit set stage. Based on our studies, we found that bunch dipping with 30 µL/L GA3 (at 50% of full bloom) and 10µL/L BA (at pea size) significantly reduced the problem of shot berries, and improved the yield and quality in grape cv. Perlette.

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Corrigendum to: Influence of gibberellic acid and N6-benzyladenine on the development of seed and shot berries in the seedless grape (Vitis vinifera L.) cv. Perlette

Australian Journal of Agricultural Research ◽

10.1071/ar04202_co ◽

2005 ◽

Vol 56 (9) ◽

pp. 1009

Author(s):

K. Usha ◽

D. Kashyap ◽

B. Singh

Keyword(s):

Gibberellic Acid ◽

Fruit Set ◽

Vitis Vinifera L ◽

High Concentration ◽

Full Bloom ◽

Seed Formation ◽

Table Grapes ◽

Yield And Quality ◽

Seedless Grape

Gibberellins have been used to improve quality of grapes in several cases. However, gibberellic acid (GA) alone is not enough to improve the quality in Perlette. A field experiment was conducted on 3-year-old grape cv. Perlette trained on pergolas, to investigate the effect of bunch dipping with GA3 and N6-benzyladenine (BA) on reducing the problem of shot berries and improving the productivity of grapevines. Our observations proved that the stage of application of GA3 and BA is crucial to avoiding seed formation in seedless varieties such as Perlette for table grapes. The results showed that BA at low (10 �L/L) or high concentration (30 �L/L) at 50% of full bloom caused seed development in the seedless grape cv. Perlette, whereas no seed was formed when BA was used later at the fruit set stage. Based on our studies, we found that bunch dipping with 30 �L/L GA3 (at 50% of full bloom) and 10�L/L BA (at pea size) significantly reduced the problem of shot berries, and improved the yield and quality in grape cv. Perlette.

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YIELD AND QUALITY OF SULTANI GRAPES (VITIS VINIFERA L.) TREATED WITH 28-HOMOBRASSINOLIDE AND GIBBERELLIC ACID

Applied Ecology and Environmental Research ◽

10.15666/aeer/1705_1244112450 ◽

2019 ◽

Vol 17 (5) ◽

Author(s):

B IŞÇI

Keyword(s):

Gibberellic Acid ◽

Vitis Vinifera ◽

Vitis Vinifera L ◽

Yield And Quality

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Gibberellic Acid Applied at Bloom Reduces Fruit Set and Improves Size of 'Crimson Seedless' Table Grapes

HortScience ◽

10.21273/hortsci.36.4.706 ◽

2001 ◽

Vol 36 (4) ◽

pp. 706-709 ◽

Cited By ~ 32

Author(s):

N.K. Dokoozlian ◽

W.L. Peacock

Keyword(s):

Gibberellic Acid ◽

Fruit Set ◽

Single Application ◽

Full Bloom ◽

Cluster Number ◽

Application Timing ◽

Table Grapes ◽

Berry Size ◽

Bunch Rot

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).

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