Résumé:
Fungi such as Trichoderma and Gliocladium associated with parasitic behavior manifested by a
coil around the hyphae of fungi filaments. This study showed the antagonistic effect of
Trichoderma viride against the different fungal isolates infecting the plant Zea mays. The strain
of Trichoderma viride was isolated from Jijel soil character by humid climate. By different organs
(roots, stems and leaves) of plant Zea mays have been isolated 28 fungal strains belonging to 17
genus: Absidia, Alternaria, Aspergillus, Botrytis, Cladosporium, Epicoccum, Fusarium,
Geotrichum, Melanconium, Monileilla, Penicillium, Phoma, Pythium, Scopulariopsis, Scytalidium,
Trichoderma and Ulocladium. The test of direct confrontation between Trichoderma viride and
fungal isolates was made on PDA. The competitive action of Trichoderma viride on the pathogen
in the presence or absence of zone of inhibition was seen in this test. The growth rate of fungal
isolates and Trichoderma viride has been determined. Trichoderma viride reached the
confluence of the Petri dish four days after sowing, so that different fungal isolates occupy a
surface of 29% to Fusarium roseum, 13% for Epicoccum sp2, 44% for Epicoccum sp3, 21% for
Monileilla sp, 15% for Absidia sp and 6% for Trichoderma sp2 which corresponds to an inhibition
of mycelia growth of fungal isolates tested
