Sempra Nutgrass Killer 25g Treats 2000sqm – $65 For selective post-emergence control of Nutgrass and Mullumbimby Couch in Turf. Sempra Nutgrass Killer 25g was last modified: August 8th, 2019 by John KeleherSempra Nutgrass Killer 25g was last modified: August 8th, 2019 by John Keleher