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Ce volume regroupe les textes issus du programme Casdar « Semence et Sélection Variétale » finalisés en 2015, 2017 et 2019. Le numéro a été coordonné par le Comité Scientifique du Comité Technique Permanent de la Sélection des plantes cultivées (CTPS).Nouvelles méthodes d'évaluation des résistances variétales aux bioagresseurs; The barley national collection, made of 570 French accessions, was evaluated during three years for tenagro-morphological traits in a multisite network (heading, plant height, loading, spike compactness, spikerow number, disease susceptibilities). Furthermore, the whole collection was genotyped for a set of 1056SNPs. Field evaluation results show a wide diversity for all observed traits. The use of empiric selectionindex on disease traits (barley leaf rust, powdery mildew, leaf blotch, net blotch, Ramularia leaf spot)makes it possible to define two different panels of 43 accessions (winter and spring types) showing highlevel of resistance for each studied pathogen. From SNPs genotyping data, clustering analysis of thewhole collection exhibits the importance of winter vs spring type and spike row number as factors toexplain genetic structure. A first approach of GWAS between markers and traits indicates a total of 1666significant associations (p