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Master Thesis

Pest incidence and biological regulations in an apple treebased agroforestry system

Abstract : Agroforestry (AF) is considered as a lever to enhance ecosystem services, especially pest control. An innovative Apple tree-based AF system was set, with apple trees grown under hybrid walnut trees, in an alley-cropping design. The impact on apple tree pest dynamics, Natural Enemies (NE) and biological regulations of such design has been investigated for the first time. The Neighbourhood Crowding Index (NCI), a continuous variable, was used as explanatory variable characterizing the AF context for each apple tree: the higher this index, the stronger the agroforestry effect. In Spring 2019, Dysaphis plantaginea and Aphis sp incidence were followed weekly, as well as the incidence of the first generation of C. pomonella. Marked colonies of D. plantaginea were followed weekly to assess D. plantaginea dynamic, together with ants and NE abundances by taxon. D. plantaginea incidence was not significantly correlated to NCI, contrarily to Aphis sp (positive correlation). Low levels of C. pomonella incidence did not permit satisfactory conclusion. Within D. plantaginea colonies, aphid densities were positively correlated to NCI, potentially linked with the greater abundance of ants observed in AF context. No correlation was found between NCI and NE abundances, with however a negative correlation with Coccinellidae. No effects of ants-tending or predation on D. plantaginea (except for Syrphidae larvae) could be shown. As walnut tree seems to have limited effect on biological regulations, the proposal of new agroecological infrastructures was made to increase pest control.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-02371027
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Submitted on : Tuesday, November 19, 2019 - 4:46:01 PM
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Camille Perseval. Pest incidence and biological regulations in an apple treebased agroforestry system. Life Sciences [q-bio]. 2019. ⟨dumas-02371027⟩

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