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

Abstract

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.

Soil, rhizosphere, and root microbiome in kiwifruit vine decline, an emerging multifactorial disease

“…In the last decade, several perennials, including different woody plant species, have been increasingly affected by decline. Affected agroecosystems include vineyards ( Fontaine et al, 2016 ; Gramaje et al, 2018 ; Merot et al, 2023 ), olive groves ( Luvisi et al, 2017 ), peach ( Yang et al, 2012 ), apple ( Mazzola and Manici, 2012 ; Nicola et al, 2018 ), citrus ( Ezrari et al, 2021 ), and kiwifruit orchards ( Savian et al, 2020 ).…”

In Vitro Evaluation of Some Endophytic Bacillus to Potentially Inhibit Grape and Grapevine Fungal Pathogens

“…Unlike other fungal diseases, suppressing GTDs is more challenging as these pathogens are installed inside the wood and remain asymptomatic for a longer time [7,[31][32][33]38]. These specific infections make it difficult for winegrowers to predict the risks and implement preventive control methods to minimize the development of spoilage fungi and GTDs [10,[31][32][33]39]. Generally, fungal disease management is focused on applying combined control strategies using different prophylactic, cultural, biological, and chemical practices [31,38,[40][41][42][43][44][45].…”