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Master Thesis

Étude du développement spatio-temporel du scolyte des baies, de la cercosporiose et de la rouille orangée dans des systèmes agroforestiers hétérogènes à base de café

Abstract : In agroforestry systems, dynamics of pests and their evolution over time depend on a number of factors (biotic and abiotic often in interacion). The overall objective is to understand the spatio-temporal development of three pests of coffee which have different life traits, coffee leaf rust (Hemileia vastatrix), brown leaf spot (Cercospora coffeicola) and coffee berry borer (Hypothenemus hampei) and to deduce pest control strategies. A monthly monitoring of the populations of these three pests was carried out on a plot of 4 ha in Turrialba, Costa Rica, where different agroforestry systems and different management strategies are compared. A model built step by step, taking into account the spatial heterogeneity of the environment, especially the light, and movement of pests, explained the spatial dependence of pests coffee. The uses of generalized models enable us to build prediction maps and put in evidence the distribution patterns and the possible presence of disease foci. A diffuse spatial distribution, with a strong influence of the management of plots, is observed for leaf rust, the average rate of cumulative incidence is 40% with a distance of dispersion between 12 and 15 m. However, the spatial distribution of the brown leaf spot and the coffee borer is aggregated – some disease foci are localized where sunlight is most important. The average rate of cumulative incidence of brown leaf spot is 10% with a dispersion distance of 10 and 11m . For coffee berry borer, the average of rate of fruit is of 2% with a moving distance of 4 to 13m . Eventually, control of coffee leaf rust should be generalized whereas that the current strategy of control of brown leaf spot and coffee berry borer based in total area may be replaced by site specific, where foci are localized, that is to say in the sunny areas.
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Master Thesis
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Cyrielle Deswarte. Étude du développement spatio-temporel du scolyte des baies, de la cercosporiose et de la rouille orangée dans des systèmes agroforestiers hétérogènes à base de café. Sciences du Vivant [q-bio]. 2015. ⟨dumas-01251969⟩

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