In the course of the present study, a series of new double salt ionic liquids (DSILs The greatest reduction in CMC value (lower by 45% compared to assumptions) was observed for DSIL containing MCPA:dicamba in a molar ratio amounting to 6:4. Thus, the strategy involving formation of these surface-active DSILs may allow for effective reduction of the amount of surfactants or active agent used for treatment.