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The project is organized into 2 actions. One aims to validate a set of molecular markers associated with resistance and susceptibility to X. pruni (quarantine disease) in genetic backgrounds different from those previously tested, in order to effectively screen varieties of peach trees for this disease and thus provide them with recommendations for planting in sensitive areas. These markers will be validated on a batch of about forty varieties known for their least or strong sensitivity to X. pruni. The second action is aimed at the creation of X. pruni resistant peach plant material, created from pro-breeding resistance to this disease provided by an American team from Clemson University (USA). Hybrid individuals from two controlled crosses are planted in an orchard plot of SEFRA (Rhône-Alpes), in which this bacterial disease is endemic. The ongoing experiment, after genotyping and phenotyping on foliage and fruit, aims to provide improved plant material resistant to X. pruni, which will serve as elite genitors for private breeders.