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BACKGROUND
Leptosphaeria maculans, the cause of stem canker of oilseed rape, develops gene‐for‐gene interactions with its host and shows a high evolutionary potential to ‘break down’ novel resistance genes (R, Rlm) deployed in cultivars over large areas. For optimal management of R genes, updated knowledge of the population structure of the pathogen is needed. In France, large‐scale surveys have...
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