Influence of timing and intensity of fruit zone leaf removal and kaolin applications on bunch rot control and quality improvement of Sauvignon blanc grapes, and wines, in a temperate humid climate

2017 ◽  
Vol 223 ◽  
pp. 62-71 ◽  
Author(s):  
V. Ferrari ◽  
E. Disegna ◽  
E. Dellacassa ◽  
A. Coniberti
Keyword(s):  
Quality Improvement ◽  
Leaf Removal ◽  
Humid Climate ◽  
Sauvignon Blanc ◽  
Bunch Rot

Effects of leaf removal on grape cluster architecture and control of Botrytis bunch rot in Sauvignon Blanc grapevines in Southern Brazil

2020 ◽  
Vol 131 ◽  
pp. 105079
Author(s):  
Douglas André Würz ◽  
Leo Rufato ◽  
Amauri Bogo ◽  
Ricardo Allebrandt ◽  
Betina Pereira de Bem ◽  
...  
Keyword(s):  
Southern Brazil ◽  
Leaf Removal ◽  
Sauvignon Blanc ◽  
Cluster Architecture ◽  
Bunch Rot ◽  
And Control

scholarly journals Response of Tannat (Vitis vinifera L.) to pre-flowering leaf removal in a humid climate

OENO One ◽  
2021 ◽  
Vol 55 (2) ◽  
pp. 251-266
Author(s):  
Leandro Arrillaga ◽  
Gerardo Echeverría ◽  
Bruno Izquierdo ◽  
Juan José Rey ◽  
Alejandra Pallante ◽  
...  
Keyword(s):  
Block Design ◽  
Production Capacity ◽  
Seasonal Effect ◽  
Leaf Removal ◽  
Humid Climate ◽  
Traditional Practice ◽  
Climate Conditions ◽  
Bunch Rot ◽  
Berry Composition ◽  
Source Sink

The aim of this study was to test the effect of pre-flowering leaf removal (PFD) on grape sanitary status, yield, source-sink balance and berry composition. A completely random block design experiment was conducted over four seasons in a commercial vineyard of the Tannat/SO4 combination located in the south of Uruguay (34° 35´30 S, 56° 15´23 O). The PFD treatment was compared with a commercial defoliation (CC) comprising partial leaf removal between the fruit set and cluster closure stages (four leaves from the first node), a traditional practice carried out by winegrowers. Both treatments received equal phytosanitary management during the study. The results were conditioned by seasonal meteorological conditions, particularly rainfall, temperature and evapotranspiration. The seasonal effect was significant for yield components, berry composition and source-sink balance. The PFD treatment resulted in the lowest yields in all four years and modified the primary and secondary composition of berries. It also showed a higher anthocyanin potential in 2016, 2017 and 2019, related to a higher percentage of exposed clusters, lower yield and/or higher leaf to fruit ratio. In 2017, environmental conditions were more favourable for the development of bunch rot, and lower values of incidence (3 %) were recorded for the PFD treatment compared to CC (22 %), due to greater exposure of bunches and less compact bunches. The PFD vines showed a steady reduction in dry matter production capacity, mainly explained by the steady reduction in yields. The Tannat variety showed a differential response to PFD depending on the weather during the growth cycle. Under humid climate conditions, pre-flowering defoliation proved to be effective for yield control, by reducing bunch rot incidence, and for improving some attributes in terms of grape composition. This work provides useful information for grape growers in humid regions on how to improve the sanitary status and quality of their production.

Effect of cluster zone leaf removal on monoterpene profiles of Sauvignon Blanc grapes and wines

2020 ◽  
Vol 131 ◽  
pp. 109028 ◽  
Author(s):  
Xiaofeng Yue ◽  
Xin Ma ◽  
Yali Tang ◽  
Ying Wang ◽  
Bowen Wu ◽  
...  
Keyword(s):  
Leaf Removal ◽  
Sauvignon Blanc

Combined Effects of Early Season Leaf Removal and Climatic Conditions on Aroma Precursors in Sauvignon Blanc Grapes

2017 ◽  
Vol 65 (38) ◽  
pp. 8426-8434 ◽  
Author(s):  
Paolo Sivilotti ◽  
Rachele Falchi ◽  
Jose Carlos Herrera ◽  
Branka Škvarč ◽  
Lorena Butinar ◽  
...  
Keyword(s):  
Climatic Conditions ◽  
Combined Effects ◽  
Leaf Removal ◽  
Sauvignon Blanc ◽  
Early Season ◽  
Aroma Precursors

Canopy manipulation of Okanagan Riesling vines for improvement of winegrape quality

1992 ◽  
Vol 72 (2) ◽  
pp. 489-496 ◽  
Author(s):  
A. G. Reynolds ◽  
P. L. Sholberg ◽  
D. A. Wardle
Keyword(s):  
Untreated Control ◽  
Titratable Acidity ◽  
Leaf Removal ◽  
Basal Leaf ◽  
Bunch Rot ◽  
Canopy Management

Vigorous, Geneva Double Curtain-trained Okanagan Riesling vines were subjected over a 2-yr period (1987–1988) to four canopy manipulation practices: shoot positioning; shoot positioning plus postbloom hedging to 12 leaves per shoot; basal leaf removal; and an untreated control, in combination with the presence or absence of iprodione (Rovral 50WP) fungicide sprays. Shoot positioning and shoot positioning plus hedging reduced weight of cane prunings relative to control vines in 1988, but increased yield, cluster weight, and berries per cluster. Shoot positioning, shoot positioning plus hedging, and basal leaf removal reduced °Brix in 1988, but tended to reduce titratable acidity in both seasons. Shoot positioning plus hedging reduced pH in 1987, while shoot positioning and shoot positioning plus hedging reduced pH and potassium (K+) in 1988. Neither Rovral nor canopy manipulation appeared to have any significant impact on the percentage of bunch rot-affected clusters. Shoot positioning of Geneva Double Curtain-trained Okanagan Riesling is recommended as a method to reduce titratable acidity, pH and K+, hence improving potential winegrape quality.Key words: Vitis, grape, hedging, shoot positioning, leaf removal, canopy management

Fruit zone leaf removal influences vegetative, yield, disease, fruit composition, and wine sensory attributes of Vitis vinifera L. 'Optima' and 'Cabernet franc'

1997 ◽  
Vol 77 (1) ◽  
pp. 149-153 ◽  
Author(s):  
S. L. Staff ◽  
D. C. Percival ◽  
J. A. Sullivan ◽  
K. H. Fisher
Keyword(s):  
Vitis Vinifera ◽  
Botrytis Cinerea ◽  
Canopy Structure ◽  
Sensory Attributes ◽  
Vitis Vinifera L ◽  
Leaf Removal ◽  
Cabernet Franc ◽  
Fruit Composition ◽  
Wine Composition ◽  
Bunch Rot

The influence of fruit zone leaf removal treatments (0, 50, and 100%) on grapevine canopy structure, incidence of bunch rot (Botrytis cinerea Pers.:Fr.), yield components, fruit and wine composition and wine sensory attributes was studied on Vitis vinifera L. 'Optima' and 'Cabernet franc'. The 50 and 100% leaf removal reduced leaf layer number, percent interior leaves and percent interior clusters. Yield was reduced between 29 and 46%. Severity of bunch rot in Optima and incidence and severity for Cabernet franc were reduced by leaf removal. Leaf removal improved colour, aroma and palatability of both Optima and Cabernet franc wines. Key words: Botrytis cinerea, defoliation, canopy management

scholarly journals Botrytis cinerea control on Sauvignon blanc using a recycling sprayer

2012 ◽  
Vol 65 ◽  
pp. 249-255
Author(s):  
V. Raw ◽  
D.C. Mundy ◽  
A.R.G McLachlan ◽  
C. Clifford ◽  
M. Walter
Keyword(s):  
New Zealand ◽  
Disease Control ◽  
Botrytis Cinerea ◽  
Wine Industry ◽  
Target Area ◽  
Economic Threshold ◽  
Control Efficacy ◽  
Sauvignon Blanc ◽  
Bunch Rot ◽  
Excellent Coverage

The New Zealand wine industry is strongly committed to sustainable production The SprayPro Rseries sprayer is designed to recycle unused chemical sprays not deposited on the target area Sauvignon blanc vines in Marlborough New Zealand were studied during 2011/2012 The vineyard area was 5 ha at 80 flowering where the full canopy was sprayed and 10 ha at pre bunch closure (PBC) targeting the fruiting zone only Disease control efficacy of spray recycling was investigated using Botrytis cinerea as the model pathogen Pathogen colonisation of necrotic leaf discs placed in the canopy at 80 flowering and PBC showed even control of B cinerea At PBC 80 of the watersensitive papers had adequate to excellent coverage Botrytis bunch rot incidence and severity were evenly expressed throughout the block but increased during preharvest; severity was well below the 3 economic threshold Recycling of botryticides did not affect disease control

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