Abstract: This invention refers to natural fungicide used in the treatment of seeds or soil treatment, that were obtained from the formulation of quillay extracts, rich in saponin concentrations, to which synthetic polymers (latex and resins) were added allowing its slow release on the soil, and which control efficiency was proven on the Gaeumannomyces graminis fungus, which is the cause of the take-all of wheat at experimental plant pot and field level.