Vigor thresholded NDVI is a key early risk indicator of Botrytis bunch rot in vineyards
Autor: | Yaneris Mirabal, Marc Fermaud, Carolina Pañitrur-De la Fuente, Cesar Acevedo Opazo, Jean Roudet, Nicolás Verdugo-Vásquez, Jean Pascal Goutouly, Héctor Valdés-Gómez, V. Felipe Laurie |
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Přispěvatelé: | Instituto de Investigaciones Agropecuarias (INIA), Pontificia Universidad Católica de Chile (UC), Santé et agroécologie du vignoble (UMR SAVE), Université de Bordeaux (UB)-Institut des Sciences de la Vigne et du Vin (ISVV)-Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Universidad Autonoma de Chile, Universidad de Talca, Ecophysiologie et Génomique Fonctionnelle de la Vigne (UMR EGFV) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
Vegetative reproduction [SDV]Life Sciences [q-bio] 0208 environmental biotechnology 02 engineering and technology Berry Horticulture 01 natural sciences Vineyard Normalized Difference Vegetation Index Veraison lcsh:Agriculture Botrytis cinerea Skin pectin content lcsh:Botany 2. Zero hunger biology Skin tannin content lcsh:S food and beverages Vegetative growth Integrated pest management (IPM) Herbaceous plant biology.organism_classification lcsh:QK1-989 020801 environmental engineering Fungicide Susceptibility Vitis vinifera [SDE]Environmental Sciences 010606 plant biology & botany Food Science |
Zdroj: | OENO One OENO One, Institut des Sciences de la Vigne et du Vin (Université de Bordeaux), 2020, 52 (2), pp.279-297. ⟨10.20870/oeno-one.2020.54.2.2954⟩ OENO One, Vol 54, Iss 2 (2020) |
ISSN: | 2494-1271 |
Popis: | Botrytis bunch rot (BBR) is a major disease occurring in vineyards worldwide. Its control is still largely based on the use of synthetic fungicide sprayings at predetermined intervals, which often produces negative residues in grapes and wines that may affect the environment and/or human health. To rationalize BBR management, disease risk indicators were developed and evaluated in a set of field experiments carried out between 2010 and 2019 in France and Chile. Key indicators include early grapevine vegetative growth, i.e. ground-based normalized difference vegetation index (NDVI), and the potential berry susceptibility to Botrytis cinerea, which is driven by tannin content in the skin. Under these contrasting weather and cropping conditions, regression analyses, including weather information, showed a highly significant positive correlation between the early NDVI, measured at berry pea size stage, and BBR incidence or severity at harvest, whereas the opposite was demonstrated for tannin content in the berry skin measured at an early herbaceous fruit stage. The exponential relationship between the final disease severity and the early NDVI allowed us to identify a possible threshold NDVI value, i.e. between 0.5 and 0.6, under which the BBR severity should be lower or close to 5% at harvest (BBR tolerance threshold for wine quality). Accordingly, in a leaf-removal vineyard experiment in France, the NDVI level at berry pea size stage was strictly controlled to correspond to three different increasing index values: 0.45, 0.60, and 0.78. Following this increase in NDVI, a significant increase in final BBR severity was noticeable, i.e. 2.4%, 6.6% and 9.9%, respectively. Very interestingly, the NDVI increase was also related to a significant decrease in the tannin content in the skin of herbaceous berries at veraison, from 47 to 22 mg tannin/g skin. All regression analyses explaining BBR development were highly significant, showing the weather conditions before harvest as the primary factor. They also show that some of the disease risk indicators chosen, especially early NDVI, could be used in the future as tools in decision support systems for deciding to spray and/or scheduling optimized fungicide applications during the season. |
Databáze: | OpenAIRE |
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