Disclosed herein are N-alkyl amide substituted spiroheterocyclic pyrrolidine dione compounds of general formula (I), wherein the substituents are as defined within the specification, processes for preparing them, pesticidal, in particular insecticidal, acaricidal, molluscicidal and nematicidal compositions comprising them and to methods of using them to combat and control pests such as insect, acarine, mollusc and nematode pests.
