Subject matter of the present invention is an emulsifiable concentrate comprising a water-insoluble pesticide, an amide of the formula (I) as defined herein, and a lactamide of the formula (II) as defined herein. The invention further relates to a process for the preparation of said concentrate; an emulsion obtainable by mixing water, a water-insoluble pesticide, the amide of the formula (I) and the lactamide of the formula (II); and to a method for controlling phytopathogenic fungi and/or undesired vegetation and/or undesired attack by insects or mites and/or for regulating the growth of plants, where the concentrate or the emulsion is allowed to act on the respective pests, their environment or on the crop plants to be protected from the respective pests, on the soil and/or on undesired plants and/or on the crop plants and/or their environment.