Abstract: A selective herbicide composition comprising as an active ingredient at least one herbicidal compound selected from the group of thiolcarbamate, triazine, chloroacetanilide, carbamide or phenoxyacetic acid herbicides in admixture with a quantity of 0.1 to 50% (by weight of the herbicidal compound) of a dichloroacetamide derivative of the formula I ##STR1## wherein X is oxygen, sulphur, SO or SO.sub.2,n is 0 or 1, andR.sub.1 and R.sub.2 are identical or different and represent hydrogen, alkyl or halophenyl, hydroxyl or nitro; orR.sub.1 and R.sub.2 together form a butylene, pentylene or hexylene group which can be substituted with one or two methyl groups,provided that if n=0, R.sub.1 and R.sub.2 are not for hydrogen, alkyl or substituted phenyl.