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Régulations écologiques d’un complexe de bioagresseurs du bananier dans un gradient de complexité végétale des agroécosystèmes

Abstract : Agriculture intensification and biological simplification of agroecosystems lead to the loss of ecosystem functions while chemical control of pests is not sustainable. Agroecosystem plant diversification is increasingly recognized as a way to restore positive interactions among plants benefiting crops, such as pest regulations. But diversification that causes resource sharing must not be done at yields’ expense. If vegetation complexity is the basis for pest regulation services, what should be the level of the regulations to compensate for yield losses due to competition for resources? What should be the composition and structure of the plant community to synergistically optimize multiple pest regulations and yields? First, I quantified by theoretical modeling the minimal levels of pest regulation required to compensate for yield losses due to competition in various association and resource scenarios. I then conducted a field study to study the ecological regulations of three important pests of bananas along a vegetation complexity gradient. Finally, I quantified the amount of yield losses attributable to pests and resources. I discuss the interactions between pest damage and resource competition at plant scale, the mechanisms implied in ecological regulations of the three banana pests and the management of the plant community at field scale for the synergic regulation of multiple pests and yield optimization.
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https://tel.archives-ouvertes.fr/tel-01498721
Contributor : Charlotte Poeydebat <>
Submitted on : Thursday, March 30, 2017 - 3:07:31 PM
Last modification on : Monday, October 19, 2020 - 11:05:09 AM

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  • HAL Id : tel-01498721, version 1

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Poeydebat Charlotte. Régulations écologiques d’un complexe de bioagresseurs du bananier dans un gradient de complexité végétale des agroécosystèmes. Biodiversité et Ecologie. Université de Montpellier, 2016. Français. ⟨tel-01498721⟩

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