Quali-Pro® 83014008 1.33 oz SedgeMaster Herbicide. SedgeMaster is a sulfonylurea herbicide that works by inhibition of acetolactate synthase (ALS). SedgeMaster is a selective, post-emergent herbicide concentrate designed to specifically kill nutsedge and other broadleaf weeds without injury to turfgrasses and ornamentals. SedgeMaster is labeled for warm- and coolseason turfgrasses, landscaped areas and other non-crop areas.