Adaptation of the regional agronomic diagnosis for grapevine yield analysis

Mérot, Anne; Métay, Aurélie; Smits, Nathalie; Thiollet‐Scholtus, Marie

doi:10.20870/oeno-one.2022.56.1.4568

Cited by 6 publications

(2 citation statements)

References 28 publications

(42 reference statements)

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“…Additionally, the dynamics of productivity indicators, such as yield or YAR, were less precise grapevine decline markers than the mortality rate because of their higher inter-annual variability. Since yield is an integrative variable of all practices and abiotic/ biotic stresses during the two years of yield elaboration, such inter-annual yield fluctuations are not surprising (Merot and Smits, 2020;Merot et al, 2022;Clingeleffer, 2010).…”

Section: Temporal and Spatial Progression Of Declinementioning

confidence: 99%

A systemic approach to grapevine decline diagnosed using three key indicators: plant mortality, yield loss and vigour decrease

et al. 2023

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Grapevine decline, a major global viticulture issue, is defined as a multi-year decrease in vine productivity and/or increase in vine mortality. Although grapevine trunk diseases are one of the most-studied causes, decline is multifactorial and associated with more than 70 factors, including abiotic and biotic hazards. With so many factors to consider, the phenomenon difficult to understand, especially for winegrowers. Our study aims to make it easier to determine and assess grapevine decline by focusing on three key indicators: yield, mortality and vegetative vigour. We investigated the relationships between these indicators from both a temporal and spatial perspective to propose a set of diagnostic indicators. Thus, we conducted a winegrowers’ survey, an historical analysis of grapevine decline and field measurements of the abovementioned indicators on plot networks in three major French winegrowing regions (see graphical abstract): Bordeaux, Cognac and Languedoc. We found that farmers’ perceptions of decline were consistent with an objective characterisation of decline based on in-field measurements of the indicators. Although vine mortality progressively spread over the years, neither the survey nor the historical analysis showed a direct link between decline and yield loss. Rather, large yearly fluctuations in yield, which did not systematically decrease over time, account for this finding. As a result, the mortality rate and the normalised difference vegetation index (NDVI) indicators were shown to be earlier indicators of grapevine decline than yield loss (yield achievement ratio, YAR). We performed a multifactorial analysis of the overall data set from the three regions to deepen our understanding of the variety of declining situations and the underlying environmental and management factors contributing to decline. Finally, two ground-based NDVI indicators and an image-analysis methodology using aerial photographs were proposed as easy-to-obtain indicators of grapevine decline. NDVI indicators were linearly correlated to both YAR and mortality rate. This study provides a better understanding and promising tools for early diagnosis of grapevine decline.

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Section: Temporal and Spatial Progression Of Declinementioning

confidence: 99%

A systemic approach to grapevine decline diagnosed using three key indicators: plant mortality, yield loss and vigour decrease

et al. 2023

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“…Yet, further research is needed to better understand winegrape yield variability and to develop techniques for stabilising yields [4]. Tis knowledge is increasingly important because obtaining consistent yields is becoming more difcult with climate change [5].…”

Section: Introductionmentioning

confidence: 99%

Winegrape Yield and Revenue Variability in Australia

Puga,

Anderson

2024

Australian Journal of Grape and Wine Research

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While winegrowers usually want to achieve consistent yield targets, there is a high degree of yield and price (and hence gross revenue) variability in winegrape production. The aim of this study was to determine whether there are differences in yield and revenue variability across climates, varieties, and regions in Australia. This was performed by estimating statistical models of the impact of these three variables on the coefficient of variation of yield and gross revenue per hectare. The results suggest that hotter and drier regions exhibit lower interannual yield variability, something that in the past may have been largely explained by the use of irrigation, but which may change in the future with climate change and higher water prices. The results also showed that there are sometimes differences in yield and revenue variability, not only across regions, but also between varieties.

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Explaining yield dynamics during vineyard conversion to organic farming

Merot,

Smits

2024

European Journal of Agronomy

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Adaptation of the regional agronomic diagnosis for grapevine yield analysis

Cited by 6 publications

References 28 publications

A systemic approach to grapevine decline diagnosed using three key indicators: plant mortality, yield loss and vigour decrease

A systemic approach to grapevine decline diagnosed using three key indicators: plant mortality, yield loss and vigour decrease

Winegrape Yield and Revenue Variability in Australia

Explaining yield dynamics during vineyard conversion to organic farming

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