Compounds of the formula I and the salts and N-oxides thereof wherein X is O or S(=O) m; m is 0, 1, 2; n is 0,1 or 2; p is 1 or 2; R 3U is C 1 -C 4 -haloalkyl, C 2 -C 4 -haloalkenyl and C 3 -C 4 -haloalkynyl wherein halogen is fluorine; U is a 5- to 10-membered heteroaromatic ring-system selected from the group consisting of pyridine, pyrimidine, pyrazine, pyridazine, 1,3,5-triazine, quinoline, 1H-indole, 1 H-benzoimidazole, benzothiazole, benzooxazole, benzofuran, benzothiophene, 1H-pyrrole, 1H-pyrazole, 1H-1,2,4-triazole, 1H-imidazole, 1H-1,2,3-triazole, 1H-tetrazole, thiophene, thiazole, 1,3,4-thiadiazole, furan, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, wherein the heteroaromatic ring may be substituted by one to four substituents V, V is independently halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl-C 1 -C 3 -alkyl which may be substituted with halogen atoms, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C(=O)R 4, C(=S)R 4, S oR 10, CN, NO 2, an amino group which may be substituted or disubstituted by C 1 -C 4 -alkyl or by C 1 -C 4 -acyl; o is 0, 1 or 2; R 1, R 2 are independently of each other selected from the group consisting of hydrogen, halogen, C 1 -C 6 -alkyl which may be substituted by halogen, by C 1 -C 4 -alkoxy, by C 1 -C 4 -alkylthio, by C 1 -C 4 -alkylsulfinyl, by C 1 -C 6 -alkylsulfonyl, by CN, by C(=O)R 4, by OC(=O)R 4, by N-(C 1 -C 3 -alkyl) 2, or by OH, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 3 -C 6 -cycloalkyl- C 1 -C 3 -alkyl which may be substituted by halogen atom(s), CN, C(=O)R 7, C(=S)R 7, C(R 11)=NR 12, C(R 11)=N-OR 12, or R 1 and R 2 may form together with the carbon atom whereto they are bonded C 3 -C 6 -cycloalkyl, C=C(R 5)R 6 or C=N-OR 5; R 4 is hydrogen, hydroxyl, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, NR 8 R 9; R 5 is hydrogen or C 1 -C 4 -alkyl; R 6 is C 1 -C 6 -alkoxy, NR 8 R 9; R 7 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy which may be substituted by halogen, by C 1 -C 4 -alkoxy, by C 1 -C 4 -alkoxy-C 1 -C 4 -alkoxy, by C 1 -C 4 -alkylthio, by C 1 -C 4 -alkylsulfinyl, by C 1 -C 6 -alkylsulfonyl, by C 3 -C 6 -cycloalkyl, by tetrahydrofuryl, by phenyl, by pyridyl [wherein the last two mentioned radicals may be substituted by halogen], by CN, by C(=O)OR 12 or by C(=O)NR 11 R 12, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyloxy which may be substituted by halogen, C 3 -C 6 -cycloalkylthio which may be substituted by halogen, NR 8 R 9, C 1 -C 6 -alkylthio, N(R 13)C(=O)N(R 14)R 15 or the following groups W 1 to W 5: R 8 and R 9 form together with the nitrogen atom to which they are attached an amino, or mono-(C 1 -C 6 -alkyl)amino or di-(C 1 -C 4 -alkyl)amino or C 2 -C 5 -cyclic amino groups. R 11, R 12, R 13, R 14 and R 15 are independently from each other hydrogen, C 1 -C 6 -alkyl; R 10 is C 1 -C 6 -alkyl which may be substituted by halogen, by C 1 -C 4 -alkoxy, by C 1 -C 4 -alkoxy-C 1 -C 4 -alkoxy, by S 0 -C 1 -C 6 -alkyl, by phenyl or by tetrahydrofuryl, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 3 -C 6 -cycloalkyl-C 1 -C 3 -alkyl which may be substituted with halogen atoms. X is O or S(=O) m; m is 0, 1, 2; n is 0,1 or 2; p is 1 or 2; R 3U is C 1 -C 4 -haloalkyl, C 2 -C 4 -haloalkenyl and C 3 -C 4 -haloalkynyl wherein halogen is fluorine; U is a 5- to 10-membered heteroaromatic ring-system selected from the group consisting of pyridine, pyrimidine, pyrazine, pyridazine, 1,3,5-triazine, quinoline, 1H-indole, 1 H-benzoimidazole, benzothiazole, benzooxazole, benzofuran, benzothiophene, 1H-pyrrole, 1H-pyrazole, 1H-1,2,4-triazole, 1H-imidazole, 1H-1,2,3-triazole, 1H-tetrazole, thiophene, thiazole, 1,3,4-thiadiazole, furan, oxazole, isoxazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, wherein the heteroaromatic ring may be substituted by one to four substituents V, V is independently halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl-C 1 -C 3 -alkyl which may be substituted with halogen atoms, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C(=O)R 4, C(=S)R 4, S oR 10, CN, NO 2, an amino group which may be substituted or disubstituted by C 1 -C 4 -alkyl or by C 1 -C 4 -acyl; o is 0, 1 or 2;