The present invention relates to novel oxaspirocyclic spirophenyl-substituted tetramic acid and tetronic acid derivatives of the formula (I)in whichW, X, Y, Z, A, B, D, Q1, Q2, and G have the meanings given above,to a plurality of processes for their preparation and to their use as pesticides and/or herbicides. The invention also provides selective herbicidal compositions comprising, firstly, oxaspirocyclic spirophenyl-substituted tetramic acid and tetronic acid derivatives and, secondly, a crop plant compatibility-improving compound.The invention furthermore relates to increasing the activity of crop protection compositions comprising compounds of the formula (I) by addition of ammonium salts or phosphonium salts and, if appropriate, penetrants.
