The invention relates to novel compounds of the formula (I) in which W, X, Y, Z, A and G have the meanings given above, to a plurality of processes and intermediates for their preparation and to their use as pesticides and/or herbicides and/or fungicides. Moreover, the invention relates to selectively herbicidal compositions comprising, firstly, the spiroheterocyclically substituted tetramic acid derivatives and, secondly, a crop plant compatibility-improving compound. The present invention furthermore relates to the boosting of the action of crop protection compositions comprising in particular spiroheterocyclically substituted tetramic acid derivatives through the addition of ammonium or phosphonium salts and optionally penetrants, to the corresponding compositions, to processes for their preparation and to their use in crop protection as insecticides and/or acaricides and/or fungicides and/or for preventing unwanted vegetation.
