Abstract: Phytopharmaceutical wettable powder comprising at least one phytopharmaceutical active substance which is solid at ambient temperature and at least one pulverulent inert filler, characterized by the fact that the constitutive particles of the filler constitute a support or carrier for the active substance comprised within a liquid composition, said active substance being selected from the group comprising:the esters of the family of the parahydroxybenzonitriles of the group comprising bromoxynil octanoate, bromoxynil heptanoate, bromoxynil butyrate, ioxynil octanoate, ioxynil heptanoate, ioxynil butyrate,the triazines of the group comprising simazine, atrazine and ametryne,the dinitroanilines of the group comprising butraline, pendimethaline, trifluraline, orizaline,the substituted ureas of the group comprising diuron, isoproturon, ethidimuron,the sulphonylureas of the group comprising especially chlorsulfuron.