The present invention relates to the use of ethyl hydrogen phosphonate (fosetyl) and/or its salts for controlling Fusarium oxysporum f.sp. cubense in plants or plant varieties of the Musaceae family, in particular bananas and plantains. The present invention further relates to corresponding methods of controlling Fusarium oxysporum f.sp. cubense in plants or plant varieties of the Musaceae family.Uso del fosfonato de etilo de hidrógeno (fosetil) y/o sus sales en el control de Fusarium oxysporum f.sp. cubense en plantas o variedades de plantas de la familia Musaceae, particularmente en bananos o plátanos. Métodos para controlar Fusarium oxysporum f.sp. cubense en plantas o variedades de plantas de la familia Musaceae.