A COMPOUND OF FORMULA (I): WHEREIN R¹ IS PYRID-4-YL OPTIONALLY SUBSTITUTED BY ONE TO FOUR SUBSTITUENTS INDEPENDENTLY SELECTED FROM HALOGEN, C1-3 ALKYL OR C1-3 HALOALKYL； R² IS HYDROGEN, HALOGEN, C1-4 HALOALKYL OR C1-4 HALOALKOXY； R³ IS TRIFLUOROMETHYL, DIFLUOROMETHYL OR DIFLUOROMETHOXY AND R⁴ IS HYDROGEN, FLUORO OR CHLORO, OR R³ IS FLUORO, CHLORO OR BROMO AND R⁴ IS FLUORO, CHLORO OR TRIFLUOROMETHYL； AND R⁵ IS HYDROGEN OR HALOGEN； OR SALTS OR N-OXIDES THEREOF. FURTHERMORE, THE PRESENT INVENTION RELATES TO INTERMEDIATES USED TO PREPARE COMPOUNDS OF FORMULA (I), TO METHODS OF USING THEM TO COMBAT AND CONTROL INSECT, ACARINE, MOLLUSE AND NEMATODE PESTS AND TO INSECTICIDAL, ACARICIDAL, MOLLUSCICIDAL AND NEMATICIDAL COMPOSITIONS COMPRISING THEM.
