The present invention relates to novel imidazole derivatives of formula (I) as active ingredients which have microbiocidal activity, in particular fungicidal activity: wherein R1 is halogen, C1-C4alkyl or C1-C4haloalkyl； R2 is an optionally substituted aryl or heteroaryl； R3 is halogen； R4 is hydrogen, halogen, C1-C4alkyl, C1-C4haloalkyl, C1-C4alkoxy, C1-C4haloalkoxy or cyano； R5 is halogen； X is N or C(R)； and R is hydrogen, halogen, C1-C4alkyl, C1-C4haloalkyl, C1-C4alkoxy, C1-C4haloalkoxy or cyano； or an agrochemically usable salt form thereof； provided that when X is C(R), R2 cannot be an optionally substituted aryl.
