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Blackleg,caused by Leptosphaeria maculans,is one of the most devastating diseases in B.napus production in Australia,Canada and Europe.Development of Blackleg resistant canola varieties is the most effective and sustainable approach to control this disease.There are two types of resistance to L.maculans in Brassica species.The first is qualitative,single race-specific resistance,which depends on the presence of a resistance (R) gene in the canola and a corresponding avirulence (Avr) gene in the pathogen.