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The impact of climate change on the development of agricultural pests, their hosts and natural enemies: Assessing overlaps in trophic interactions

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Defense Thèse de doctorat : Univ. Genève, 2019 - Sc. 5406 - 2019/10/24
Abstract This thesis assess impacts of warming temperatures on future Grapevine (Vitis vinifera) and one of its major insect pest known as grapevine moth (Lobesia botrana)synchrony. The phenology of both trophic levels has already changed over the last decades in response to increases in temperature, with a tendency towards earlier development. The impact of rising temperatures could alter phenology and lead to unequal shifts within food chains, being either beneficial or detrimental to host plants. The pressure for reducing the use of chemicals in conventional agriculture is getting stronger in the last decade. Biocontrol by targeting the eggs of other insects is an efficient alternative to pesticides. This study aimed at understanding how L. botrana will evolve with respect to both its lower (V. vinifera) and upper (Trichogramma Spp.) trophic levels under warmer conditions in the future, considering the forcing pathways RCP4.5 and RCP8.5, at European scale, by the means of generic phenological models.
Keywords Phenological modelsClimate change scenariosTrophic interactionsSynchronyShiftsRiskVoltinism
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URN: urn:nbn:ch:unige-1385373
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Thesis (10.1 MB) - public document Free access
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Research group Climatic Change and Climate Impacts
Project Ernst et Lucie Schmidheiny
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CASTEX, Victorine. The impact of climate change on the development of agricultural pests, their hosts and natural enemies: Assessing overlaps in trophic interactions. Université de Genève. Thèse, 2019. doi: 10.13097/archive-ouverte/unige:138537 https://archive-ouverte.unige.ch/unige:138537

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Deposited on : 2020-07-22

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