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RESEARCH PRODUCT

Orobanche rameuse du tabac (Phelipanche ramosa L.) : Identifier de nouvelles solutions conventionnelles et de biocontrôle

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description

The branching broomrape, Phelipanche ramosa L. is an obligate parasitic plant, which in a few years became a major agronomic problem for tobacco crops in France. Two approaches, aiming at controlling broomrape were tested within the framework of the ELIOT project grouping Arvalis, the CT2F cooperative and the INRA center of Dijon. The first relates to sulfonylurea herbicides, including rimsulfuron and sulfosulfuron and a systemic herbicide of the cyclohexanediones family, clethodim. The results, although instructive, do not reflect an effective control of broomrape. The second approach deals with the search for soil-borne fungi that are pathogenic to broomrape. A large number of fungal strains associated with symptoms observed on broomrapes have been isolated. Most belongs to the genus Fusarium. Some inhibit the seeds germination or / and cause stem necrosis on tobacco branching broomrape. These promising results of a potential mycoherbicide need to be validated in co-culture in soil.