Gouvernance de la santé des plantes et gestion de la biodiversité cultivée - le cas de la santé du haricot gérée par les membres de l'association "Croqueurs de Carottes"

Abstract : All over the globe, networks of seed growers are cultivating crop diversity in fields and gardens. Their contribution to the maintenance of this diversity has been studied, but research has widely left aside their management of plant health. The governance of bean health practiced by an association of artisanal seed companies, Croqueurs de Carottes, is approached as a case study in the objective of specifying how management of crop diversity and governance of plant health are articulated. Their concern for the governance of bean health is elucidated from an agroecological perspective, taking an interdisciplinary and transformative approach. Actor-network theory constitutes the backbone of the thesis, situated between agronomy and sociology and drawing upon a threefold research device: on-farm experiments, semi-directive interviews and participant observation.The Croqueurs' approach to bean health is described as in situ approach, in which plant populations are considered healthy if they are able to live with potential plant pathogens and adapt to their growing environments. Relying on ecological interactions, competences of plant health management are distributed throughout the production system. Both for plant health and crop diversity management, a seed lot is determined by a complex system of interactions. A clear boundary distinguishing plant populations from their growing environment cannot be drawn. This implies (i) that plant health must be judged upon in situ in the plants' growing environment and (ii) that the governance of plant health must be considered at the
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Stéphanie Klaedtke. Gouvernance de la santé des plantes et gestion de la biodiversité cultivée - le cas de la santé du haricot gérée par les membres de l'association "Croqueurs de Carottes". Ecologie, Environnement. Agrocampus Ouest, 2017. Français. ⟨NNT : 2017NSARC128⟩. ⟨tel-01887182⟩

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