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Deightoniella torulosa est un champignon frequemment associe aux attaques des cercosporioses sur les principaux cultivars de bananier en Cote-d\'Ivoire. Les symptomes qu\'il induit sont mal connus et les attaques occasionnees en plantation sont negligees. Le champignon a ete isole et son pouvoir pathogene a ete mis en evidence sur des fragmentsde feuilles et des feuilles entieres de differents cultivars de bananiers en utilisant differentes concentrations de spores : a 104, 5.104 et 105 spores / ml. Des coupes histologiques ont ete aussi realisees. Les resultats ont mis en evidence l\'activiteparasitaire du champignon sur les fragments de feuilles et sur les feuilles entieres. La periode d\'incubation est de 3 a 5 jours. La germination des spores debute en moins d\'une heure et atteint 95 a 100 % au bout de 4 heures. L\'evolution des symptomes varie en fonction des cultivars. L\'ampleur des attaques s\'est revelee importante lorsque lesconcentrations de spores sont elevees. Le champignon provoque des attaques severes pour des concentrations de 105 spores / ml. Ainsi, Deightoniella torulosa induit seul des attaques, colonise les tissus du limbe foliaire et contribue a la senescence prematuree des feuilles de bananiers. Deightoniella torulosa is a fungus usually associated with symptoms of black sigatoka leaf streak in Cote-d\'Ivoire. The pathogenic activity of the fungus is not well known and its effect on field is neglected. The fungus has been isolatedand its pathogenic activity has been determined on leaves of cultivated banana through the use of different concentrations of conidia: 104, 5.104 and 105 spores / ml. Inoculated samples have been fixed for histological observations. Results showed stomata penetration and pathogenic activity of fungus beginning from the third (3rd) to the fifth (5th) day after inoculation. We observed that conidia germination begins in less than 1 hour and reaches95 to 100 % within 4 hours. The progress of the disease varies according to the according to the banana cultivars and the amount of conidia. 105 spores / ml have induced symptoms. Then, Deightoniella torulosa alone could induce symptoms and was involved in rapid necrosis of infected leaves in natural conditions. Keywords : Deightoniella torulosa, activite parasitaire, inoculations, cultivars de bananiers, senescence, Cote-d\'Ivoire./Deightoniella torulosa, pathogenic activity, inoculations, cultivated banana, Cote-d\'Ivoire. Sciences & Nature Vol. 4 (2) 2007: pp. 179-188

sciences and nature. série a, biosciences agronomie environnement biotechnologie

Caractérisation pathologique in vitro de deightoniella torulosa (Syd.) Ellis sur les cultivars de bananiers figue sucrée (musa AA), grande naine (musa AAA) et orishele (musa AAB)