Use of compounds Formula (I), A=a 5- to 7-membered ring which may contain 1-3 heteroatoms and which may be saturated or partially or completely unsaturated; R1═OH, SH, NH2, CN, NO2, halogen, C1-C6-alkyl, C1-C6-haloalkyl; C1-C6-alkoxy, C1-C6-haloalkoxy, C1-C6-alkylthio, C1-C6-haloalkylthio, C2-C6-alkenyl, C2-C6alkenyloxy, C2-C6-alkenylthio, C2-C6-alkynyl, C2-C6-alkynyloxy, C2-C6-alkynylthio, C1-C6-alkylsulfonyl, C1-C6-alkylsulfoxyl, C2-C6-alkenylsulfonyl, C2-C6-alkylsulfoxyl, C1-C6-alkylcarbonyl, C1-C6-alkoxycarbonyl, C1-C6-aklylcarbonyloxy; R2═C1-C6-alkyl or a mono- or bicyclic 5- to 10-membered aromatic ringsystem which may contain 1 to 4 heteroatoms and which is either bonded directly or through an O, S, C1-C6-alkylene or C1-C6-alkyleneoxy linkage to A or fused to A and which may be substituted; R3, R4═H, C1-C6-alkyl, C1-C6-haloalkyl, C1-C6-alkyl-amino, C1-C6-alkoxy, C3-C6-cycloalkyl, or R3 and R4 together with the nitrogen atom to which they are attached form a saturated or partially saturated mono- or bicyclic 5- to 10-membered ring system containing 1 to 3 heteroatoms or a 5-membered hetaryl containing 1 to 4 nitrogen atoms, wherein the carbon and/or nitrogen atoms in the ring systems may be substituted or phenyl or benzyl which may be substituted; or R3 and R4 together form the chains —(CH2)2N+(O—)(CH2)2— or —(CH2)3N+(O−)(CH2)2—; m=0 to 4; n is 0 to 4; and the enantiomers, diastereomers, cis/trans isomers or salts thereof for combatting insects, arachnids or nematodes, methods for the control of these pests and of protecting growing plants attack or infestation by these pests by applying a pesticidally effective amount of a compound of formula (I), processes for preparing them, and compositions comprising them.