you need a 'semi selective translocated herbicide' and a 'calibrated applicator'. Dilution rate is 1:100. trade names can change but veredone is a watered down/different version of what is available to the trade. NAD are the suppliers of this they are at blakes cross near lusk north dublin. this allows you to spray the whole lawn as the molecular make up does not allow the AI[active ingredient attach] to the thin[ie not broad] leaves of the grass plant.