Propoxycarbazone-Sodium (also known as BAY MKH 6561) is asulfonylaminocarbonyltriazolinone derivative patented by German multinational pharmaceutical and life sciences company Bayer A.-G. as herbicide Propoxycarbazone inhibits acetolactate synthase (ALS), and has selectivity on spring, winter, and durum varieties. The spectrum of control includes several species of monocot and dicot weeds at the application rates of 30 to 45 g/ha. Bromus control is the primary target since existing herbicides have limited timing, selectivity, and use patterns which reduce usefulness. Propoxycarbazone applied postemergence between the 1- to 2-leaf stage and shoot elongation has provided economic control of the following Bromus species: B. tectorum, B. secalinus, B. mollis, B. rigidus, and B. japonicus. Side effects, and sometimes control, was also noted on Aegilops tauschii for which there is no selective control outside genetically altered wheat cultivars. Broadleaf control was obtained primarily on the mustard family, including species in the genera Sisymbrium, Brassica, Descurainia, Chorispora, Camelina, Capsella, and Thlaspi. Propoxycarbazone provides control for adequate weed spectrum, however, considerations of resistance management, difficult and diverse weed pressure, and extended growing seasons will sometimes necessitate the use of sequential herbicides or mix partners.