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Theses

Recueil et Formalisation de procédés experts pour conduire une protection intégrée du vignoble

Abstract : Consumption of phytopharmaceutics by French viticulture is high. Two fungal diseases, powdery mildew and downy mildew make up for 70% of the yearly pesticides spendings for that crop. As they can cause total destruction of the harvest these diseases are seen as pestilences by the growers. As of today, considering the risks, chemical protection is the sole efficient mean of protection. A Crop Health team (Santé Végétale in Bordeaux) has undertaken since 2001 to solve the difficult task of designing decisional pest management systems for the vineyard. Innovative systems have to demonstrate that, in conformance with Integrated Pest Management (IPM) principles, it is possible to produce high quality grape with a low number of fungicide treatments. The team achieves this by evaluating disease levels plot by plot and by structuring knowledge in what we call a Decision Workflow System (DeWS). The pathologists have adopted an iterative design scheme, interweaving design phases with plot scale experiments. At the end of the third iteration (2001 2003 2005) they felt the need for a more formalised approach. My task consisted in identifying, and, if required, creating the formal tools and methods that would allow the experts to ameliorate their design. The three following needs were stated: to be able to communicate the DeWS; to be able to evaluate its operational aspect; to make the DeWS reliable. The DeWS concept is a prescriptive approach, making decisions at the operational level, for which crop protection is seen as a process spanning over the whole season. Knowledge elicitation of the process was carried out using the discrete events system language Statechart. Statechart Diagrams have been used as the media between the expert designers and the knowledge engineer. This novel knowledge elicitation method is a research result on its own along with the resulting model of the Grapevine powdery and downy Mildew DecisionWorkflow System (GrapeMilDeWS) (POD Mildium in French). Two validation methods were designed to evaluate the quality of the elicited model and identify differences of behaviour between decision observed during the experiments and the model's simulations. The model has been validated against the data from two experiments (2005; 2006). It showed 85% decision similarity. This thesis highlights the advantages of the workflow management Engineering (using Statecharts) to analyse and design crop protection systems.
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https://tel.archives-ouvertes.fr/tel-00372383
Contributor : Bertrand Léger Connect in order to contact the contributor
Submitted on : Wednesday, April 1, 2009 - 9:33:56 AM
Last modification on : Wednesday, January 19, 2022 - 3:07:18 AM

Identifiers

  • HAL Id : tel-00372383, version 2
  • IRSTEA : PUB00025878

Citation

Bertrand Léger. Recueil et Formalisation de procédés experts pour conduire une protection intégrée du vignoble. Génie des procédés. Ecole nationale superieure agronomique de montpellier - AGRO M, 2008. Français. ⟨tel-00372383v2⟩

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