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   Reduced herbicide use required by French and European legislation will change weed management. Weeds are very harmful for crop production but contribute to biodiversity in agricultural landscapes. Consequently, reduced herbicide use, agricultural production and biodiversity conservation must be reconciled in arable crops. The project team consists of multidisciplinary partners (ecologists, agronomists, modellers,...) from research and development in order to: (1) understand and quantify with experiments the effects of novel agricultural practices on weed flora and on the functioning of the agroecosystem, (2) design tools predicting the effects of agricultural practices and pedoclimate on weed flora, (3) use these tools to design weed management strategies and to evaluate their performance in various contexts of changing agricultural practices, climate and biodiversity, (4) facilitate the adoption of the novel weed management strategies by farmers.