Rôle de rhizoctonia solari Kühn dans la manifestation de certains symptômes de verse parasitaire du mais
1983
Perraton, B. | Lucas, Philippe
En Vendée, dans l’Ouest de la France, il est fréquent d’observer des symptômes de verse parasitaire précoce sur maïs, liée à d’importantes nécroses racinaires. Des Fusarium, principalement F. oxysporum, sont très souvent isolés mais en utilisant un milieu d’isolement plus sélectif, on constate la présence très fréquente de Rhizoctonia solani. Des essais d’inoculation au champ à différentes doses d’inoculum et à différents stades de la plante montrent le rôle de R. solani dans la manifestation de ce symptôme de verse
Show more [+] Less [-]In Western France (Vendee area), maize root rot and lodging occur very frequently. Lodging appears especially on plants with severe root rot after high winds or heavy rains. The fungi which have been isolated have mostly been Fusarium oxysporum and F. roseum (less frequently). Rhizoctonia solani was found very exceptionally until the technique of isolation was modified. Inoculation of maize with F. oxysporum neither affected plant growth nor induced root rot, but it was very easy to induce the field symptoms observed in Vendee by inoculation with R. solani. Various techniques have been improved and the pathogenicity of R. solani to maize has been shown. Isolates of this fungus belong to anastomosis group 2 (A.G. 2)
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