Influence de la distance aux bandes fleuries sur la consommation de nectar et le contrôle du puceron par le parasitoïde Diaeretiella rapae en parcelle de colza

Abstract : Nectar provisioning by flowering field margins provides food subsidies and contributes to enhance biological control by natural enemies. Sugar resources can improve parasitoids fitness but it is difficult to track their consumption in agricultural fields. We developed a new 13C isotope enrichment method for Centaurea cyanus extra-floral nectar labeling, allowing us to identify, among parasitoids captured at several distances from flowering margins, those which fed with marked nectar. The influence of the distance from flowering margins on insects diversity in crop, on the number of Diaeretiella rapae parasitoids fed with border's nectar, and on Brevicoryne brassicae aphids infestation was investigated in rapeseed production fields. We found no evidence of how flowering field margins can enhance natural pest control but we captured marked parasitoids up to 20 meters in field. Our results show the efficiency and interest of the developed method for insects nectar consumption tracking in agro-ecosystems.
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Master thesis
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Simon Dosdat. Influence de la distance aux bandes fleuries sur la consommation de nectar et le contrôle du puceron par le parasitoïde Diaeretiella rapae en parcelle de colza . Sciences de l'environnement. 2014. ⟨hal-01836419⟩

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