The present invention relates to an aqueous suspension concentrate (SC) comprisingA) picolinafen or an agriculturally acceptable salt thereof andB) at least one anionic surfactant containing at least one sulfonate group or at least one sulfate group,wherein the weight ratio between components A) and B) is in the range from 1:1 to 10:1.The invention also relates to a method for preparation of the SC according to the invention, to its use for controlling unwanted vegetation and to the methods of use. The invention is further relates to the use of an anionic surfactant containing at least one sulfonate group or sulfate group as a crystal growth inhibitor in agrochemical aqueous suspension concentrates.
