Vivian Zufferey
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View article: Increasing grapevine canopy height to compensate for pre-flowering basal leaf removal
Increasing grapevine canopy height to compensate for pre-flowering basal leaf removal Open
Yield loss following intensive pre-flowering leaf removal (LR) can be up to 40-50 % of initial potential. A study conducted by Agroscope on the white grapevine Petite Arvine evaluated the effects of higher hedge trimming to compensate for …
View article: Gestion raisonnée de l’azote en viticulture : de l’observation à l’analyse du moût
Gestion raisonnée de l’azote en viticulture : de l’observation à l’analyse du moût Open
Comprendre et gérer la nutrition azotée de la vigne est crucial pour produire des vins de qualité. L'observation visuelle est la première étape, complétée par des outils comme l'indice chlorophyllien et l’analyse foliaire. L’azote total du…
View article: Interaction of Environment and Vineyard Management Effects Shape Microbial Functionality, <i>Terroir</i>, and Grape Qualities
Interaction of Environment and Vineyard Management Effects Shape Microbial Functionality, <i>Terroir</i>, and Grape Qualities Open
Vineyards are complex agroecological systems, with geographically distinct microbial communities playing a central role in mediating vine health, grape quality, and ultimately local wine characteristics ( terroir) . However, the extent to …
View article: Arrière-effets de la régulation du rendement sur les raisins de l’année suivante
Arrière-effets de la régulation du rendement sur les raisins de l’année suivante Open
La gestion intégrée de la nutrition azotée de la vigne garantit une composition adéquate des raisins à la récolte en fonction de l’objectif de production (rendement et composition). Un essai agronomique a permis d’observer les effets combi…
View article: Landscape-scale endophytic community analyses in replicated grapevine stands reveal that dieback disease is unlikely to be caused by specific fungal communities
Landscape-scale endophytic community analyses in replicated grapevine stands reveal that dieback disease is unlikely to be caused by specific fungal communities Open
Tree diebacks are complex and multifactorial diseases with suspected biotic and abiotic components. Microbiome effects on plant health are challenging to assess due to the complexity of fungal and bacterial communities. Grapevine wood dieb…
View article: Classification of the geographical origin of Pinot noir wines from southwestern Switzerland using isotopes, volatile organic compounds, and chemometrics
Classification of the geographical origin of Pinot noir wines from southwestern Switzerland using isotopes, volatile organic compounds, and chemometrics Open
This study examined the potential of carbon and nitrogen isotopes of wine solid residues with semi-quantitative amounts of volatile organic compounds to characterize Pinot noir wines from different regions in southwestern Switzerland. Sign…
View article: Increasing grapevine canopy height to compensate for pre-flowering basal leaf removal
Increasing grapevine canopy height to compensate for pre-flowering basal leaf removal Open
In viticulture, leaf removal (LR) in the cluster area is an effective practice against fungal diseases. Pre-flowering LR often has additional consequences compared to post-flowering LR, such as yield limitation, higher fruit maturity index…
View article: A divergent haplotype with a large deletion at the berry color locus causes a white-skinned phenotype in grapevine
A divergent haplotype with a large deletion at the berry color locus causes a white-skinned phenotype in grapevine Open
The current genetic model explaining berry skin color in Vitis vinifera is incomplete and fails to predict berry skin color phenotypes for one allele of VvMybA1, referred to as VvMybA1_SUB. Our study focuses on this specific allele, reveal…
View article: Identifying the pedoclimatic conditions most critical in the susceptibility of a grapevine cultivar to esca disease
Identifying the pedoclimatic conditions most critical in the susceptibility of a grapevine cultivar to esca disease Open
Esca, one of the most destructive grapevine trunk diseases, is still poorly understood. As grapevine cultivars vary widely in their susceptibility to esca, we designed a four-year experiment to identify the environmental factors that influ…
View article: Exploring grapevine canopy management: effects of removing main leaves or lateral shoots before flowering
Exploring grapevine canopy management: effects of removing main leaves or lateral shoots before flowering Open
This study highlights the physiological effects of pre-flowering leaf removal from the fruiting zone of the Swiss white grape variety Petite Arvine, which is rich in varietal thiols. Pre-flowering removal of main leaves instead of lateral …
View article: Vineyard Leaf Canopy Management: Timing of the First Hedge-Trimming
Vineyard Leaf Canopy Management: Timing of the First Hedge-Trimming Open
Delaying the date of the first hedge-trimming (or ‘tip-pruning’) is of limited technical value in vineyard canopy management. The impact of the delay on lateral shoot growth and must composition remains marginal within the context of the L…
View article: Exploring grapevine canopy management: effects of removing main leaves or lateral shoots before flowering
Exploring grapevine canopy management: effects of removing main leaves or lateral shoots before flowering Open
Over the course of a six-year trial, we investigated the physiological response of the Swiss white cultivar Vitis vinifera Petite Arvine, rich in varietal thiols, to the following canopy removal treatments from the cluster area, i.e. from …
View article: Impact of foliar nitrogen supplementation on Chardonnay and Sauvignon Blanc wines
Impact of foliar nitrogen supplementation on Chardonnay and Sauvignon Blanc wines Open
The effectiveness of an application of foliar nitrogen at veraison depends on the initial level of vine nitrogen deficiency, an Agroscope study has shown. The threshold levels of assimilable nitrogen deficiency in the grape must are valida…
View article: Impact of canopy management on thiol precursors in white grapes: a six-year field study
Impact of canopy management on thiol precursors in white grapes: a six-year field study Open
The mechanisms behind thiol precursor accumulation in grapes remain incompletely understood, nor are the ways in which they can be improved by agronomic practices. A six-year field trial studied the physiological response of the Swiss whit…
View article: Landscape-scale endophytic community analyses in replicated grapevine stands reveal that dieback disease is not caused by specific fungal communities
Landscape-scale endophytic community analyses in replicated grapevine stands reveal that dieback disease is not caused by specific fungal communities Open
Tree diebacks are complex and multi-factorial diseases with suspected biotic and abiotic components. Microbiome effects on plant health are challenging to assess due to the complexity of fungal and bacterial communities. Grapevine wood die…
View article: Mechanisation of pre-flowering leaf removal under temperate climate conditions
Mechanisation of pre-flowering leaf removal under temperate climate conditions Open
Grapevine leaf removal (LR) in the cluster area is a common practice in temperate and cool climates, usually done between berry-set and cluster closure to create a less favourable microclimate for fungal diseases and to improve grape ripen…
View article: Carbon isotope discrimination (so-called δ<sup>13</sup>C) measured on grape juice is an accessible tool to monitor vine water status in production conditions
Carbon isotope discrimination (so-called δ<sup>13</sup>C) measured on grape juice is an accessible tool to monitor vine water status in production conditions Open
Assessment of vine water status is needed to understand the effect of environmental factors and management practices on dry-farmed and irrigated vineyards. Among plant-based indicators, carbon isotope discrimination (δ13C) is easily access…
View article: Nitrogen nutrition status of the vine: correlation between N-tester and SPAD chlorophyll indices
Nitrogen nutrition status of the vine: correlation between N-tester and SPAD chlorophyll indices Open
Knowledge of the nitrogen nutrition status of the vine is essential for long-term management of its nutrition with the aim of producing high-quality grapes. Measurement of the chlorophyll index is a fast, non-destructive and relatively ine…
View article: Mechanisation of pre-flowering leaf removal under the temperate climate conditions of Switzerland
Mechanisation of pre-flowering leaf removal under the temperate climate conditions of Switzerland Open
The present trial follows a previous study about pre-flowering leaf removal (LR) (Verdenal et al., 2019) and validates the sustainability of mechanical pre-flowering LR under local Swiss vineyard conditions, using a low-pressure double air…
View article: A systemic approach allows to identify the pedoclimatic conditions most critical in the susceptibility of a grapevine cultivar to esca/Botryosphaeria dieback
A systemic approach allows to identify the pedoclimatic conditions most critical in the susceptibility of a grapevine cultivar to esca/Botryosphaeria dieback Open
Esca and/or Botryosphaeria dieback (esca-BD) are two of the most destructive grapevine trunk diseases in the world, disease complex which remains poorly understood. As some vine cultivars show highly variable susceptibility to esca-BD, we …
View article: Future climatic conditions may threaten adaptation capacities for vineyards along Lake Neuchâtel, Switzerland
Future climatic conditions may threaten adaptation capacities for vineyards along Lake Neuchâtel, Switzerland Open
In Switzerland, as elsewhere in the world, climate change is challenging viticulture. Knowledge of the potential impacts is essential for preparing adaptation measures. Two aspects directly impacted by increasing temperatures are the choic…
View article: Soil management affects carbon and nitrogen concentrations and stable isotope ratios in vine products
Soil management affects carbon and nitrogen concentrations and stable isotope ratios in vine products Open
Weeds reduce vineyard productivity and affect grape quality by competing with grapevines (Vitis vinifera L.) for water and nutrients. The increased banning of herbicides has prompted the evaluation of alternative soil management strategies…
View article: Quantifying Trade-Offs in the Choice of Ribosomal Barcoding Markers for Fungal Amplicon Sequencing: a Case Study on the Grapevine Trunk Mycobiome
Quantifying Trade-Offs in the Choice of Ribosomal Barcoding Markers for Fungal Amplicon Sequencing: a Case Study on the Grapevine Trunk Mycobiome Open
Surveying fungal communities is key to our understanding of ecological functions of diverse habitats. Fungal communities can inform about the resilience of agricultural ecosystems, risks to human health, and impacts of pathogens.
View article: Above‐ and below‐ground responses to experimental climate forcing in two forb species from montane wooded pastures in Switzerland
Above‐ and below‐ground responses to experimental climate forcing in two forb species from montane wooded pastures in Switzerland Open
Mountain ecosystems are particularly threatened by ongoing climate change and the species composition of high elevation grasslands is already changing. An open research question is how these ecosystems will adapt to changes in their key en…
View article: Quantifying trade-offs in the choice of ribosomal barcoding markers for fungal amplicon sequencing: a case study on the grapevine trunk mycobiome
Quantifying trade-offs in the choice of ribosomal barcoding markers for fungal amplicon sequencing: a case study on the grapevine trunk mycobiome Open
The evolution of sequencing technology and multiplexing has rapidly expanded our ability to characterize fungal diversity in the environment. However, obtaining an unbiased assessment of the fungal community using ribosomal markers remains…
View article: Carryover effects of crop thinning and foliar N fertilisation on grape amino N composition
Carryover effects of crop thinning and foliar N fertilisation on grape amino N composition Open
Nitrogen (N) is an essential element for vine development and yield; it is also involved in the winemaking process and significantly affects wine composition. It is therefore essential to control and optimise plant N use to ensure an adequ…
View article: Nuances of Responses to Two Sources of Grapevine Leafroll Disease on Pinot Noir Grown in the Field for 17 Years
Nuances of Responses to Two Sources of Grapevine Leafroll Disease on Pinot Noir Grown in the Field for 17 Years Open
Grapevine leafroll disease (GLD) is one of the most economically damaging virus diseases in grapevine, with grapevine leafroll-associated virus 1 (GLRaV-1) and grapevine leafroll-associated virus 3 (GLRaV-3) as the main contributors. This …
View article: Water deficit responses of field-grown Pinot noir mediated by rootstock genotypes in a cool climate region
Water deficit responses of field-grown Pinot noir mediated by rootstock genotypes in a cool climate region Open
Under the global warming scenario, water scarcity is expected to intensify in most grape-growing regions. The use of drought-tolerant rootstocks is considered a useful tool to mitigate the negative effects of soil water deficit on vine fun…
View article: Development of downy mildew in grape bunches of susceptible and resistant cultivars: infection pathways and limited systemic spread
Development of downy mildew in grape bunches of susceptible and resistant cultivars: infection pathways and limited systemic spread Open
Background and Aims Plasmopara viticola development in bunches of two grapevine cultivars, the resistant Divico and the susceptible Chasselas, was studied by using microscopy and molecular detection to investigate tissue susceptibility and…
View article: Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation
Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation Open
Background and Aims Knowing the impact of cultural practices on nitrogen (N) dynamics in perennial crops is critical to promote N use efficiency. This study focused on the impact of crop regulation on the plant N dynamics, on the fruit N c…