The present invention comprises formulations comprising at least one pest icide and at least one co-polymer comprising a) 1-vinyl-2-pyrrolidinone as c omonomer a); and b) 60-99 wt% at least one comonomer b) chosen from the grou p of laurylacrylate and vinyl ester of neodecanoic acid in polymerized form, methods of combating harmful insects and/or phytopathogenic fungi, a method of controlling undesired vegetation and methods of improving the health of plants based on the afore-mentioned formulations.
