Combining expert knowledge and models in participatory workshops with farmers to design sustainable weed management strategies

International audience; In order to design cropping systems reconciling cropproduction, biodiversity and reduced herbicide use, weorganized participatory workshops with farmers in theChampagne region (North-Eastern France). Methodscombined cropping-system prototyping by farmers, expertopinion and models. In a first meeting, farmers determinedtheir objectives and constraints, and chose areference system existing in one of their farms (oilseedrape/winter wheat/winter wheat/spring barley heavilyinfested by autumnal grass weeds). In a secondmeeting, two sets of prototypes were designed by twoseparate groups, using the Mission Ecophyt’eau® tool(https://ecophytopic.fr/pour-aller-plus-loin/outil-m…