Postponing First Shoot Topping Reduces Grape Cluster Compactness and Delays Bunch Rot Epidemic

Molitor, Daniel; Baron, Nicole; Sauerwein, Timo; André, Christelle M.; Kicherer, Anna; Döring, Johanna; Stoll, Manfred; Beyer, Marco; Hoffmann, Lucien; Evers, Danièle

doi:10.5344/ajev.2014.14052

Cited by 37 publications

(41 citation statements)

References 25 publications

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“…This behavior could be related to more botrytis bunch rot severity observed in the Sauvignon Blanc vines without leaf removal (Table 2). Similar results were observed by Meneguzzo et al [27] who verified that color index of Gewurztraminer wines increased with the increase of the bunch rot.…”

Section: Resultssupporting

confidence: 79%

Timing of leaf removal modifies chemical and phenolic composition of Sauvignon Blanc wine

Würz

Allebrandt

et al. 2017

BIO Web Conf.

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Abstract. The objective of this work was to evaluate the effect of different defoliation times on the chemical and phenolic composition of Sauvignon Blanc wine in high altitude regions of Santa Catarina -Brazil. The experiment was conducted in the 2015 and 2016 seasons, in a vineyard located in the city of São Joaquim -Santa Catarina State. The defoliation was carried out during phenological stages: full bloom, berries pepper-corn size, pea-sized berries, veraison, 15 days after veraison and control without leaf removal. During harvest, severity of Botrytis cinerea was assessed by visual evaluation through a diagrammatic scale. For the wine samples from each season, total acidity (meq L −1 ), pH, total polyphenol content (mg L −1 of gallic acid) and color (Abs 420nm) were performed. For the wines of the 2015 harvest, phenolic compounds were analyzed: gallic acid, catechin, vanillic acid, P-coumaric acid and rutin. The chemical composition of Sauvignon Blanc wine was affected as a result of leaf removal timing, defoliation carried out in full bloom, berries pepper-corn size and pea-sized berries reduced total acidity and increased pH of the wines in both seasons. For wine color, in both seasons, it was found a greater yellow coloration in wines originated from grapes where the plants were not defoliated. The increase of yellow coloration is due to the oxidation of catechins and epicatechins, which is related to the increase of botrytis bunch rot. In the 2015 season there were no influence of leaf removal timing in total polyphenols, however, in the 2016, the defoliation performed in full bloom resulted in lower polyphenols contents. Wines from non-defoliated plants presented higher values of catechin, rutin, P-coumaric acid and gallic acid, related to yellow coloration of wines and greater susceptibility to darkening and oxidation. For vanillic acid, wines from non-defoliated plants have the lowest values, this compound is important in wine preservation. Leaf removal is an important management technique in high altitude regions of Santa Catarina -Brazil, it improves wine chemical composition, and if carried out during the stages of full bloom, pepper corn berries and pea-sized berries can reduce the severity of Botrytis bunch rot; and avoid the formation of phenolic compounds related to the processes of oxidation and darkening.

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Section: Resultssupporting

confidence: 79%

Timing of leaf removal modifies chemical and phenolic composition of Sauvignon Blanc wine

Würz

Allebrandt

et al. 2017

BIO Web Conf.

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“…Tendo em visto a estruturação do cacho da videira, segundo Molitor et al (18), a compactação de cacho é um considerado um importante parâmetro qualitativo da videira, pois cachos compactos são mais suscetíveis ao ataque de B. cinerea (10), e quando realizada a desfolha precocemente, as bagas estão em desenvolvimento e o cacho não está completamente compactado, propiciando uma boa aeração e exposição solar do cacho da videira, diminuindo o tempo de molhamento dos cachos, além de favorecer a penetração de produtos fitossanitários no interior dos cachos da videira (21,22,24), visto que a folha torna-se uma barreira física para os fungicidas atingirem o alvo biológico.…”

Section: Resultsunclassified

Desfolha precoce como estratégia de controle da podridão de Botrytis cinerea na videira Cabernet Sauvignon em regiões de altitude

et al. 2017

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RESUMO Botrytis cinerea é um dos mais importantes patógenos da videira nas regiões de altitude em Santa Catarina. O presente trabalho objetivou avaliar a influência de diferentes épocas de desfolha no progresso da podridão de B. cinerea na videira Cabernet Os ensaios foram conduzidos nas safras 2014/2015 e 2015/2016, em um vinhedo comercial, situado a 1230m (a.n.m.), no munícipio de São Joaquim, SC (28º 17’ 39” S e 49º 55’ 56” W). Foi utilizado a variedade Cabernet Sauvignon, enxertada sobre o porta-enxerto Paulsen 1103, conduzida em espaldeira, com espaçamento de 3,0m x 1,5m e cobertura anti-granizo. Os tratamentos consistiram na realização da desfolha nos estádios fenológicos: plena florada, grão chumbinho, grão ervilha, virada de cor, 15 dias após a virada de cor e plantas não submetidas ao manejo da desfolha. A doença foi quantificada quinzenalmente nos cachos, no início dos primeiros sintomas até a colheita. As curvas de progresso da doença foram elaboradas e comparadas de acordo com: início do aparecimento dos sintomas, tempo para atingir a máxima incidência e severidade da doença, incidência e severidade máxima da doença, área abaixo da curva de progresso da incidência e severidade da doença. Os resultados desse estudo evidenciam que desfolhas precoces devem ser recomendadas, como estratégia de manejo de controle de B. cinerea da videira Cabernet Sauvignon cultivada em regiões de elevada altitude de Santa Catarina.

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“…Moreover, canopy management practices have been shown to be efficient tools to manipulate the degree of fruit set, cluster compactness, and yield. Consequently, if past and present environmental conditions lead to the expectation of an excessively high yield potential (i. e., over-cropping) in the present season, yieldreducing viticultural practices such as early clusterzone leaf removal (Molitor et al, 2011;Poni et al, 2006 ;Tardaguila et al, 2008) or late first shoot topping (Hügelschäffer et al, 1994 ;Molitor et al, 2015) might be employed.…”

Section: Discussionmentioning

confidence: 99%

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

Molitor

Keller

2017

OENO One

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Methods and results:Window pane analysis showed that pre-bloom and bloom minimum temperatures and precipitation sums in the preceding year, winter temperatures, spring temperatures, and post-veraison minimum temperatures in the current year were positively correlated with annual yield; early spring and post-harvest temperatures in the preceding year, and, for Riesling, pre-bloom precipitation sums and post-bloom maximum temperatures in the current year were negatively correlated with annual yield. Models developed from these data simulated annual yield with high accuracy (R 2 adj = 0.88 for Riesling, and R 2 adj = 0.92 for Müller-Thurgau). Conclusions:Meteorological conditions during distinct periods of yield formation are correlated with annual yield. Yield models can be used in practical viticulture as well as in climate change impact studies.Significance and impact of the study: Enhanced understanding of the effects of meteorological conditions during specific periods of yield formation supports growers' efforts to optimize viticultural measures aimed at achieving adequate yield levels.

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Postponing First Shoot Topping Reduces Grape Cluster Compactness and Delays Bunch Rot Epidemic

Cited by 37 publications

References 25 publications

Timing of leaf removal modifies chemical and phenolic composition of Sauvignon Blanc wine

Timing of leaf removal modifies chemical and phenolic composition of Sauvignon Blanc wine

Desfolha precoce como estratégia de controle da podridão de Botrytis cinerea na videira Cabernet Sauvignon em regiões de altitude

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

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