The invention relates to a fungicidally active compound of formula (I): whereHet is a 5- or 6-membered heterocyclic ring containing one to threeheteroatoms, each independently selected from oxygen, nitrogen and sulphur,the ring being substituted by the groups R6, R7 and R8； R1 is hydrogen, C1-4alkyl, C1-4 haloalkyl, C1-4 alkoxy, C1-4 haloalkoxy, CH2C.ident.CR9,CH2CR10=CHR11, CH=C=CH2 or COR12； R2 and R3 are each, independently, hydrogen,halo, C1-4 alkyl, C1-4 alkoxy, C1-4 haloalkyl or C1-4 haloalkoxy； R4 and R5are each independently selected from halo, cyano and nitro； or one of R4 andR5 is hydrogen and the other is selected from halo, cyano and nitro； R6, R7and R8 are each, independently, hydrogen, halo, cyano, nitro, C1-4 alkyl, C1-4haloalkyl, C1-4 alkoxy(C1-4)alkyl, C1-4 haloalkoxy(C1-4)alkyl or C1-4haloalkoxy, provided that at least one of R6, R7 and R8 is not hydrogen； R9,R10 and R11 are each, independently, hydrogen, halo, C1-4 alkyl, C1-4haloalkyl or C1-4 alkoxy(C1-4)alkyl； and R12 is hydrogen, C1-6 alkyl, C1-6haloalkyl, C1-4 alkoxy(C1-4 )alkyl, C1-4 alkylthio(C1-4)- alkyl, C1-4 alkoxyor aryl； to the preparation of these compounds, to novel intermediates used inthe preparation of these compounds, to agrochemical compositions whichcomprise at least one of the novel compounds as active ingredient, to thepreparation of the compositions mentioned and to the use of the activeingredients or compositions in agriculture or horticulture for controlling orpreventing infestation of plants by phytopathogenic microorganisms, preferablyfungi.
