Analysis of nonlinear relationships in dual epidemics, and its application to the management of grapevine downy and powdery mildews

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dc.creatorSavary, Serge
dc.creatorDelbac, Lionel
dc.creatorRochas, Amélie
dc.creatorTaisant, Guillaume
dc.creatorWillocquet, Laetitia
dc.date2009-08
dc.date2024-12-19T12:55:54Z
dc.date2024-12-19T12:55:54Z
dc.date.accessioned2026-06-27T04:08:43Z
dc.descriptionDual epidemics are defined as epidemics developing on two or several plant organs in the course of a cropping season. Agricultural pathosystems where such epidemics develop are often very important, because the harvestable part is one of the organs affected. These epidemics also are often difficult to manage, because the linkage between epidemiological components occurring on different organs is poorly understood, and because prediction of the risk toward the harvestable organs is difficult. In the case of downy mildew (DM) and powdery mildew (PM) of grapevine, nonlinear modeling and logistic regression indicated nonlinearity in the foliage–cluster relationships. Nonlinear modeling enabled the parameterization of a transmission coefficient that numerically links the two components, leaves and clusters, in DM and PM epidemics. Logistic regression analysis yielded a series of probabilistic models that enabled predicting preset levels of cluster infection risks based on DM and PM severities on the foliage at successive crop stages. The usefulness of this framework for tactical decision-making for disease control is discussed.
dc.identifierhttps://hdl.handle.net/10568/166149
dc.identifier.urihttp://hdl.handle.net/123456789/23002
dc.languageen
dc.publisherScientific Societies
dc.sourceSavary, Serge; Delbac, Lionel; Rochas, Amélie; Taisant, Guillaume and Willocquet, Laetitia. 2009. Analysis of nonlinear relationships in dual epidemics, and its application to the management of grapevine downy and powdery mildews. Phytopathology®, Volume 99 no. 8 p. 930-942
dc.titleAnalysis of nonlinear relationships in dual epidemics, and its application to the management of grapevine downy and powdery mildews
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)