Pyrazinylpyrazole compounds (I) and/or their N-oxides or salts, are new. Pyrazinylpyrazole compounds of formula (I) and/or their N-oxides or salts, are new. X : phenyl, 2-pyridyl or 3-pyridyl (all substituted by one or more halo, alkyl, haloalkyl, alkoxy, alkoxyalkyl, alkoxyalkoxy, cycloalkyl, alkenyloxy, alkynyloxy, benzyloxy, cycloalkylalkoxy, haloalkoxy, haloalkoxyalkyl, alkylsulfanyl, haloalkylsulfanyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, CN, nitro, alkylcarbonyl, alkoxycarbonyl, alkoxycarbonylalkyl, carboxyl, carboxamide, dialkylcarboxamide, trialkylsilyl, amino, alkylamino, dialkylamino, alkylsulfonylamino, dialkylsulfonylamino, formyl, -CH=NO-H, -CH=NO-alkyl, -CH=NO-haloalkyl, -C(CH 3)=NO-H, -C(CH 3)=NO-alkyl or -C(CH 3)=NO-haloalkyl, preferably optionally substituted by halo, CN, nitro, alkyl, alkoxy or haloalkyl), where the vicinal alkyl, haloalkyl, alkoxy and/or haloalkoxy group at the phenyl, 2-pyridyl or 3-pyridyl substituents together with C forms 5-7 membered cyclic system containing 0-2 O or N, and 2 O are not-directly bonded, and its alkyl portion is optionally substituted with one or more halo and/or further alkyl residue； R 1>； : H, alkyl (optionally substituted by alkoxy, haloalkoxy, alkylsulfanyl, haloalkylsulfanyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, alkylcarbonyl, alkoxycarbonyl, OH and/or cycloalkyl), alkenyl (optionally substituted by halo, alkoxy, haloalkoxy, alkylsulfanyl, haloalkylsulfanyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, alkylcarbonyl, alkoxycarbonyl and/or cycloalkyl), cycloalkyl (optionally substituted by alkyl, haloalkyl and/or halo), haloalkyl (optionally substituted by alkoxy, alkylsulfanyl, haloalkylsulfanyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl and/or phenyl (optionally substituted by halo, alkyl, haloalkyl and/or alkoxy)), phenyl (optionally substituted by halo, alkyl, haloalkyl and/or alkoxy), benzyl
