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Projet Sclerotinia sclerotiorum : meilleure connaissance du champignon pathogène, évaluation du risque et évaluation de méthodes de protection

Abstract : The fungus Sclerotinia has been an increasing problem for producers in recent years due to increasing damages and unsatisfactory means of protection. The objectives of the Sclérolég project were to offer to growers some protection strategies combining different techniques for a better control of sclerotinia. The first axis sought to fill the knowledge gap on the variability of the pathogens and also to better understand the development of epidemics and the key epidemiological processes involved. In addition, one of the objectives was to evaluate risk prediction tools and develop new tools. Finally, the combination of different protection techniques was tested and evaluated to offer producers innovative and sustainable production systems in Scleroleg. The strains of S. sclerotiorum characterized in the project were very diverse at the genetic level and in their ability to cause symptoms in all the crops tested, which confirms the absence of specialization. Various tests were developed in particular to characterize the aggressiveness of the pathogen. Concerning the infectious process, the project showed how important ascospores are, especially for melon cultures. Sclerotinia subartica was reported for the first time in France. Concerning the quantification of soil inoculum, two original quantification techniques were developed: elutriation and the use of trap cores. In terms of managing the infectious potential of the plots, some points on the behavior of C. minitans (CONTANS®) were examined in details. Finally, the biocontrol agents experimented in Scleroleg did not provide satisfactory control of the pest infestation.
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François Villeneuve, Christel Leyronas, Philippe C. Nicot, Marc Bardin, Vincent Faloya. Projet Sclerotinia sclerotiorum : meilleure connaissance du champignon pathogène, évaluation du risque et évaluation de méthodes de protection. Innovations Agronomiques, INRAE, 2019, 71, pp.401-413. ⟨10.15454/vkn5jf⟩. ⟨hal-02627650⟩

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