The present invention relates to the use of a compound of formula (I), wherein - R is: ○ a (C1–C20)
alkyl, a heteroalkyl, a (C1–C20)alkenyl, a (C1–C20)alkynyl, the
alkyl, heteroalkyl, alkenyl or alkynyl optionally being substituted with one or more substituents chosen from a
halogen atom, an oxo group, a (C1–C8)
alkyl, an OH group, a (C1–C6)alkoxy and a C1–C6)haloalkyl; ○ a saturated or unsaturated and non-
aromatic hydrocarbon-based cyclic or polycyclic
system, each ring comprising 3 to 7, preferably 5 or 6 ring members, and optionally substituted by one or more (C1–C8)alkyls; ○ a saturated or unsaturated and non-aromatic heterocycle, each ring comprising 3 to 7, preferably 5 or 6 ring members, and comprising one or more, in particular 1 or 2, heteroatoms selected from
oxygen, sulphur and
nitrogen, and optionally substituted by one or more (C1–C8)alkyls, or an
aryl,
aryl-(C1–C6)alkyl, heteroaryl, or heteroaryl-(C1–C6)alkyl group, the group being optionally substituted with one or more substituents selected from a
halogen atom, a (C1–C8)alkyl, (C1–C6)alkoxy and (C1–C6)haloalkyl; - X is an
oxygen atom or an NR' group, with R' a
hydrogen atom or a (C1–C4)alkyl; and - n is equal to 0 or 1, for its fungicidal and / or bactericidal activity on fungi and / or oomycetes and / or
pathogenic bacteria of plants and
crop seeds.