For the selective control of weedsat a locus of weed infestation which is an area used, or to be used, for the growing of crops, e.g. the crops hereinbefore mentioned, application rates from 25 g to 500 g a.e. of the 2-benzoylcyclohexane-1,3-dione herbicide and from 150 g to 350 g a.e. of bromoxynil per hectare are part