Phenylamidines having a high fungicidal activity and use thereof

A method for the control of phytopathogenic fungi of agricultural crops comprising applying an effective amount of a phenylamidine selected from general formula (I):

• wherein:
• R represents a phenyl, pyridyl, pyrimidyl, pyrazyl or pyridazyl group, wherein said phenyl, pyridyl, pyrimidyl, pyrazyl or pyridazyl group is substituted by at least a substituent selected from C1-C6 polyfluoroalkoxy containing at least one hydrogen atom, C1-C6 polyfluoroalkylthio containing at least one hydrogen atom, C3-C6 cycloalkyl, C3-C6 halocycloalkyl, C3-C6 cycloalkoxy, C3-C6 halocycloalkoxy, C4-C8 cycloalkylalkoxy, or C4-C8 halocycloalkylalkoxy;
• said groups phenyl, pyridyl, pyrimidyl, pyrazyl or pyridazyl being optionally substituted by one or two further substituents, equal to or different from each other, selected from halogen atom, C1-C6 alkyl, or C1-C6 haloalkyl;
• R1 represents C2-C6 alkyl;
• R2 represents C1-C6 alkyl;
• or R1 and R2, together with the N atom to which they are bound, form a heterocyclic ring containing from 4 to 7 atoms, optionally substituted by halogen atoms;
• R3 and R4, equal to or different from each other, represent a hydrogen atom, a halogen atom, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkoxy, a CF3 group, a CF2H group, a CFH2 group, or a cyano group to phytopathogenic fungi of agricultural crops.