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The oilseed rape (Brassica napus) stem canker disease, due to the fungal pathogen Leptosphaeria maculans, is mainly controlled by host genetic resistance. Since 2004, the specific resistance gene Rlm7 is widely used in France. Specific resistance is effective when fungal populations are mainly composed of avirulent isolates. The development of molecular tools for the identification of virulent isolates...