The invention relates to aqueous, aluminum silicate-free, highly concentrated suspension concentrates, containing the active substance metribuzin, one or more surfactants based on nonionic polymers from the ‘acrylic grafted polymers’ group, one or more thickeners based on anionic heteropolysaccharides from the xanthan gum group, one or more wetting agents and optionally other components such as antifoaming agents, antifreeze agents and preservatives and other surfactants differing from the aforesaid components.