Abstract

The date palm vascular fusarium wilt is mainly caused by a telluric fungus, Fusarium oxysporum f.sp. albidinis. This photogene is specific and exclusively a host. It is able to invade the entire vascular system of the plant, thus causing its obstruction, then the palms' wilt and eventually the plant's death. The pathogen's behavior in the soil is depending on its relation with the rest of the telluric microflora and its environment. Our work aims at finding selective antagonistic fungi from the soil's microflora of different plots sampled from Figuig palm grove, south east Morocco. The microflora samples have shown that these soils are rich in bacteria and fungi that can play a crucial role in the biological treatment as antagonists of this pathogen fungus. Several fungi have been isolated and purified, five of them have shown a great ability to inhibit the growth of Fusarium oxysporum f .sp. albidinis in vitro culture, via different mechanisms: by secreting mycotoxins and also by competing with the fungus.