The invention relates to an aqueous adjuvant composition containing: a) one or more alkyl glucamides of formula (I) wherein R1 is a linear or branched alkyl group with five to nine carbon atoms and R2 is an alkyl group with one to three carbon atoms； b) water； c) optionally a co-solvent. The invention further relates to the use of such compositions to increase the biological activity of pesticides, preferably of herbicides, and to produce an aqueous pesticide composition.
