terclim by ICS banner
IVES 9 IVES Conference Series 9 Short-term relationships between climate and grapevine trunk diseases in southern French vineyards

Short-term relationships between climate and grapevine trunk diseases in southern French vineyards

Abstract

An increasing plant dieback has been observed in vineyards these past two decades, that has been partly attributed to the incidence of grapevine trunk diseases. Among them, esca and Botryosphaeria dieback are increasingly affecting grapevine mortality and yield loss, but little is known about the relationships between leaf symptoms and climate, hampering our ability to predict future trends in grapevine dieback. Our aim was to test short-term relationships between weather conditions and leaf symptom incidence in southern France vineyards. We harmonized and compiled summer surveys leaf symptoms of grapevine trunk disease in a database gathering 50 vineyards. Surveys were conducted on a weekly to bimonthly basis during the period 2003-2021, leading to 69 site-by-year plots. Vineyards were characterised by different ages (8 to 37 years old plants), grapevine varieties (n = 11), cultural practices, soil and climate conditions. Climate data were compiled from Safran daily data of Météo-France and averaged on different time steps. For each plot, we derived weekly rates of leaf symptom incidence using non-parametric Loess models. To account for contrasting conditions among vineyards, we scaled both leaf symptom and climate data, focusing on variations relative to plot. Statistical models show highly significant relationships between local leaf symptom trends and climatic conditions on a weekly to monthly time step. As expected, the higher the evaporative demand (temperature and humidity) the higher the incidence of new weekly cases. However, an increase in drought conditions and wind speed inhibited the incidence of leaf symptoms. Our results suggest that fungi associated with grapevine trunk diseases benefit from warm conditions but are inhibited by dry conditions that both are expected to increase in the next future. Our findings provide important insights to better understand plant-climate-diseases relationships in the field and anticipate trends for the next decades.

DOI:

Publication date: May 31, 2022

Issue: Terclim 2022

Type: Article

Authors

Thibaut Fréjaville1, Lucia Guérin-Dubrana1, Philippe Larignon2, Pascal Lecomte
and Chloé E.L. Delmas1

1INRAE, Bordeaux Sciences Agro, ISVV, Santé et Agroécologie du Vignoble (SAVE), Villenave d’Ornon, France
2Institut Français de la Vigne et du Vin, Pôle Rhône-Méditerranée, Rodilhan, France

Contact the author

Keywords

esca, Botryosphaeria dieback, modelling, weather, weekly incidence rate

Tags

IVES Conference Series | Terclim 2022

Citation

Related articles…

Riesling aroma composition in light of changing global temperatures – delving into the effects of warmer nights on the volatile profile of riesling grapes

Climate is a key parameter when the modulation of berry and subsequent wine composition is considered. Recent decades have already seen an increase in global surface temperatures

The influence of soil management practices on functional traits and biodiversity of weed communities in Swiss vineyards

Green cover in vine rows provides many ecological services, but can also negatively impact the crop, depending on the weed species. The composition of a vineyard weed community is influenced by many parameters. Ensuring an evolution of the vine row flora into a desired direction is therefore very complex. A key step towards this goal is to know which factors influence the establishment of the weed community and which types of communities are best suited for vineyards. In this study, we analysed the weed communities of several vineyards in the Lake Geneva region (379 botanical surveys on 117 plots), with the aim to highlight the links between soil management practices (chemical and mechanical weeding, mowing, mulching roll) and phytosociological profiles, biodiversity and selected functional traits (growth forms, life strategies, root depth). T

Do high temperature extremes impact berry tannin composition?

Flavonoids, including flavonols, anthocyanins, and tannins, are
important contributors to grape and wine quality, and their biosynthesis is strongly influenced by bunch microclimate. While the synergistic effect of light and temperature has been intensively examined on flavonoids in relation to bunch exposure, studies targeting the sole effect of high temperature have mostly
focused on anthocyanins during the ripening period. With tannin biosynthesis starting around flowering, heatwaves occurring earlier in the grape growing season could be critical. Only a few papers report the impact of temperature on tannin synthesis and accumulation; to date, none have examined the effect of high temperature extremes which, in the context of climate change, relates to increases in heatwave intensity.

Study of yeast biocatalytic activity on grape aroma compounds

Many volatile compounds of different chemical/biochemical origin contribute to wine aroma. Certain key ‘varietal’ aroma compounds such as methoxypyrazines are formed in the grape and appear to be only scarcely influenced by fermentation.

The informative potential of remote and proximal sensing application on vertical- and overhead-trained vineyards in Northeast Italy

The application of remote and proximal sensing in viticulture have been demonstrated as a fast and efficient method to monitor vegetative and physiological parameters of grapevines. The collection of these parameters could be highly valuable to derive information on associated yield and quality traits in the vineyard. However, to leverage the informative potential of the sensing systems, a series of preliminary evaluations should be carried out to standardize working protocols for the specific features of a winegrowing area (e.g., pedoclimate, topography, cultivar, training system). This work aims at evaluating remote and proximal sensing systems for their performance and suitability to provide information on the vegetative, physiological, yield and qualitative aspects of vines and grapes as a function of different training systems in the Valpolicella wine region (Verona, Italy).