Abstract
Blackeg is the major disease of winter oilseed rape in France. For an efficient control of the disease several tools could be combined, but mainly plant breeding has been used to increase winter oilseed rape resistance to blackleg. A useful step was reached in the nineties, using a specific resistance gene (Rlm1). After being widely used this resistance was broken down by an increase of the virulent sub-populations of the fungus. Such a situation worried the different actors and raised the question of the promotion of a durable management of genetic resistances to Leptosphaeria. After a synthetic presentation of the state of the art in the fields of genetics of resistance, of Leptosphaeria populations and on agronomic practices able to control the pathogen, the promotion of a durable management of resistances is discussed. This target needs to precise the strategy, to improve methodologies to characterise genotypes, to promote proper agronomic practices, to follow Leptosphaeria population behaviour and to motivate economic actors.
Highlights
Summary : Blackeg is the major disease of winter oilseed rape in France
A useful step was reached in the nineties, using a specific resistance gene (Rlm1)
For the 3 main virulences of interest, PCR markers are under preparation and validation in order, to enable us to quickly type the fungus from leaf spots. Such analyse, were carried out for L. maculans isolate collections done by INRA and CETIOM during the nineties [2]
Summary
For an efficient control of the disease several tools could be combined, but mainly plant breeding has been used to increase winter oilseed rape resistance to blackleg. After being widely used this resistance was broken down by an increase of the virulent sub‐populations of the fungus Such a situation worried the different actors and raised the question of the promotion of a durable management of genetic resistances to Leptosphaeria. After a synthetic presentation of the state of the art in the fields of genetics of resistance, of Leptosphaeria populations and on agronomic practices able to control the pathogen, the promotion of a durable management of resistances is discussed. Resistant cultivars bearing Rlm gene appeared susceptible Such a situation worried the different actors and raised the question of the development of adapted strategies for breeding and managing stable resistances to the disease in space and in time. Based on recent scientific works, we may distinguish two different types of resistance to Leptosphaeria maculans
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