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Les huiles de Jatropha curcas communement appele pourghere et de neem (Azadirachta indica A. Juss), sont testees comme alternatives aux pesticides chimiques dans l’optique d’y deceler de potentiels effets fongicides tout en preservant l’environnement. Les effets des deux huiles vegetales sont compares a ceux de deux fongicides conventionnels, la griseofulvine 250 mg et la nystatine ainsi que l’alcool 95°, sur cinq champignons phytopathogenes (Aspergillus flavus, Aspergillus niger, Curvularia lunata, Fusarium oxysporum et Rhizopus oryzae). Les observations ont porte sur la mesure du diametre de la zone d’inhibition exercee par les differentes substances inhibitrices a travers les milieux geloses. Le dispositif experimental applique a ete celui du bloc completement randomise de Fisher avec huit repetitions. Les moyennes des diametres de la zone d’inhibition sont respectivement de 26,51 mm pour la nystatine, 14,53 mm pour la griseofulvine, 4,53 mm pour l’huile de neem, 3,05 mm pour l’huile de jatropha, et 0,00 mm pour l’alcool 95°. L’huile de neem a eu un effet inhibiteur net sur la croissance de l’ensemble des champignons testes. En revanche, l’huile de jatropha a exerce un meilleur controle de la croissance des especes Aspergillus flavus, Aspergillus niger et Rhizopus oryzae. Les deux huiles pourraient etre recommandees dans la protection des denrees stockees, notamment les cereales.Mots cles : Extraits vegetaux, effet fongicide, zone d’inhibition, lutte alternative. English Title: Effect of Jatropha (Jatropha curcas L.) and neem (Azadirachta indica A. Juss) oils on in vitro devloppement of pathogenic funji Aspergillus flavus, Aspergillus niger, Curvularia lunata, Fusarium oxysporum et Rhizopus oryzae Oils of Jatropha curcas (pourghere) and neem (Azadirachta indica A. Juss) were tested as alternatives to chemical pesticides in a view to finding some potential fungicide effects harmless to environment. The effects of the two natural oils were compared with those of two conventional fungicides, griseofulvin 250 mg and nystatin and also alcohol 95° on five phytopathogenic fungi (Aspergillus flavus, Aspergillus niger, Curvularia lunata, Fusarium oxysporum and Rhizopus oryzae). Observations consisted in measuring the diameter of the zone of inhibition by different substances through the agarose medium. The experimental device applied was the Fisher completely randomized bloc with eight repetitions. Means of inhibition zone diameters were respectively de 26.51 mm for nystatin, 14.53 mm for griseofulvin, 4.53 mm for neem oil, 3.05 mm for jatropha oil, and 0.00 mm for alcohol 95°. The neem oil showed good inhibition effect on the growth of the whole set of tested fungi. In contrast, jatropha oil exhibited a better fungal growth control on Aspergillus flavus, Aspergillus niger and Rhizopus oryzae species. Thus, these two vegetable oils could be recommended in cereal protection in postharvest.Keywords: Vegetal oils, fungicide effects, inhibition zone, alternative control.

international journal of biological and chemical sciences

Effet des huiles de pourghère (&lt;I&gt;Jatropha curcas L.&lt;/I&gt;) et de neem (&lt;I&gt;Azadirachta indica&lt;/ A. Juss) sur le développement in vitro des champignons pathogènes Aspergillus flavus, Aspergillus niger, Curvularia lunata, Fusarium oxysporum et Rhizopus oryzae