Development an IPM system in soilless culture by using slow filtration and a biocontrol fungus, Pythium oligandrum | [Développement d'un système de lutte intégrée en culture sans sol en utilisant une filtration lente et un champignon de lutte biologique, Pythium oligandrum]
1999
Rey, P. ((Université de Bretagne Occidentale, Brest (France). Laboratoire de Microbiologie et de Sécurité Alimentaire)) | Picard, K. | Deniel, F. | Benhamou, N. | Tirilly, Y.
Epidemiological studies have shown that introduction and dispersal of pathogens into soilless greenhouses widely depend on the irrigation system implemented. To prevent serious problems of pathogen contamination, our group has developed an integrated disease management system based on the use of slow sand filtration and of a biocontrol agent, Pythium oligandrum. First, the reliability of slow sand filtration to disinfect the nutrient solution by eliminating pythiaceous, fusarium fungi and bacteria was demonstrated as a consequence, the introduction of pathogenic micro-organisms into the hydroponic culture was strongly reduced. Second, it was shown that the mycoparasite P. oligandrum successfully colonized the roots during the cultural season. This colonization was non-pathogenic and induced a slight increase in culture yield. In conclusion, the combination of slow sand filtration to disinfect nutrient solutions with the use of P. oligandrum to colonize and protect the roots from pathogenic attack can offer good prospects for minimizing or even preventing problems associated with pathogenic microorganisms in soilless cultures
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