Tribute Herbicide 1L (Envu)Tribute can be used to remove undesirable grasses such as Wintergrass, Ryegrass, Kikuyu, Paspalum and Crowsfoot Grass in actively growing couch and zoysia turf, any time the weeds are present. For control of Ryegrass and Wintergrass, speed of removal depends on air temperature. Warmer temperatures lead to faster removal. At temperatures of 21C and higher, weed kill can take place in one two weeks. If temperatures are 15C or lower, removal could take