The invention relates to the use of one or more etherified lactate esters of formula (I) for reducing the drift during the application of plant-treatment agents, wherein R represents an unbranched or branched saturated alkyl, having 1 to 30 carbon atoms, or an unbranched or branched mono- or polyunsaturated alkenyl having 2 to 30 carbon atoms, R1 represents a radical of formula -(AO)