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Master Thesis

Création et analyse d'un système d'information géographique des foyers de flavescence dorée dans le vignoble bordelais

Abstract : Flavescence dorée is a quarantine disease of grapevine, caused by a phytoplasma and transmitted by the leafhopper Schaphoideus titanus. The vineyards survey is one of the cornerstone to manage the disease. The objective of this intership was to (i) create a reliable Geographic Information System (GIS) of flavescence dorée focuses in the territory of GDON des Bordeaux and (ii) study the dynamics of the disease in this territory. Different sources of data (GDON with FD observations between 2012 ans 2017, CVI with data on cultivars, CESBIO with data on land occupation) were combined. If this process results to a lose of information, the GIS created contains 40 246 plots informed on 38 variables. The analysis of this database was focused on the infectious status of individual fields during the first prospection year. As a high spatial autocorrelation was present, these binary data were analysed with a spatially explicit GLM model fitted with the INLA method. Thereby, the plantation year, Merlot and Semillon cultivars, the proportion of grapevine and forest in landscape have a negative effect on the probability to observe the disease, whereas the presence of Cabernet-Sauvignon, the number of insecticides, and the proportion of urban have a positive effect on the presence of the disease. This constitutes the premises of a model of prediction of risk maps of FD which may guide, in a better way, the prospection strategy.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-02388891
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Submitted on : Wednesday, October 14, 2020 - 10:41:22 AM
Last modification on : Monday, April 12, 2021 - 3:26:09 AM

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Lovasoa Ramalanjaona. Création et analyse d'un système d'information géographique des foyers de flavescence dorée dans le vignoble bordelais. Sciences du Vivant [q-bio]. 2019. ⟨dumas-02388891⟩

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