Fecha de publicación: -- Fuente: WIPO "tomato" The present invention discloses a method for controlling or preventing phytopathogenic fungi in agricultural crops and/or horticultural crops by using 3-substituted phenylamidinium salts of general formula (I), wherein, R1, R2, R3, R4, A- and n are as defined in the detailed description. The present invention further discloses the 3-substituted phenylamidinium salts of general formula (I), a process for their preparation, a composition thereof, and their use for controlling or preventing phytopathogenic fungi.