Compréhension des facteurs d'invasion de l'Euphorbe ésule (Euphorbia esula L.) et des interactions avec ses régulateurs naturels, en vue d'une régulation par lutte intégrée dans les prairies humides du Val de Saône

Abstract : Leafy spurge (Euphorbia esula, Euphorbiaceae) is a weed growing in patches in the Val-de-Saone grasslands. Protected under Natura 2000 network, those grasslands are annually grazed and mowed. Due to the toxicity of its latex, leafy spurge contaminates the harvested hay. Cut hay become unfit for cattle consumption. Therefore, this study aims to understand plant/agricultural practices/natural regulators interactions to propose an integrated management against leafy spurge and thus reduce economic losses. The results show that mowing is a dominant factor involved in the proliferation of leafy spurge. Indeed, it has a direct impact on the shoot densities, which are increase by two times on average, and an indirect effect on natural regulator populations. The main auxiliary, in terms of abundance and damage caused, is a beetle, Oberea erythrocephala, whose life cycle is disrupted by mowing practices, occurring in July, during its peaks of population and reproduction. Oviposition takes place in the spurge stems, which are missing after the cut. Thus, mowing promotes the proliferation of leafy spurge while suppressing O. erythrocephala oviposition support. Based on our results, the solution would be to circumvent leafy spurge patches to harvest uncontaminated hay and increase the density of natural regulators and therefore, decreasing E. esula expansion.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2013_LIEGEOIS_MAUD.pdf
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https://hal.univ-lorraine.fr/hal-01777982
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Submitted on : Wednesday, April 25, 2018 - 11:52:13 AM
Last modification on : Thursday, April 26, 2018 - 1:15:52 AM

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Maud Liégeois. Compréhension des facteurs d'invasion de l'Euphorbe ésule (Euphorbia esula L.) et des interactions avec ses régulateurs naturels, en vue d'une régulation par lutte intégrée dans les prairies humides du Val de Saône. Sciences de l'environnement. 2013. ⟨hal-01777982⟩

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