Use of dithiin-tetracarboximides of the general formula (I) in which R1 and R2 are the same or different and represent hydrogen, C1-C8 alkyl if necessary substituted once or several times with halogen, -OR3, -COR4, C3-C7 cycloalkyl substituted if necessary once or several times with halogen, C1-C4 alkyl or halogenoalkyl C1-C4, aryl or aryl- (C1-C4 alkyl) respectively substituted if necessary once or several times with halogen, C1-C4 alkyl, halogenoalkyl C1-C4, -COR4 or sulfonylamino, R3 represents hydrogen, C1-C4 alkyl, C1-C4 alkylcarbonyl or represents aryl substituted once or several times with halogen, C1-C4 alkyl or C1-C4 halogenoalkyl, R4 represents hydroxy, C1-C4 alkyl or C1-C4 alkoxy, n represents 0 or 1, to combat phytopathogenic fungi.Uso de ditiin-tetracarboximidas de fórmula general (I) en la que R1 y R2 son iguales o distintos y representan hidrógeno, alquilo C1-C8 dado el caso sustituido una o varias veces con halógeno, -OR3, -COR4, cicloalquilo C3-C7 sustituido dado el caso una o varias veces con halógeno, alquilo C1-C4 o halogenoalquilo C1-C4, arilo o aril-(alquilo C1-C4) sustituidos respectivamente dado el caso una vez o varias veces con halógeno, alquilo C1-C4, halogenoalquilo C1-C4, -COR4 o sulfonilamino, R3 representa hidrógeno, alquilo C1-C4, alquil C1-C4-carbonilo o representa arilo sustituido dado el caso una vez o varias veces con halógeno, alquilo C1-C4 o halogenoalquilo C1-C4, R4 representa hidroxi, alquilo C1-C4 o alcoxi C1-C4, n representa 0 ó 1, para combatir hongos fitopatógenos.
