Yellownutsedge (Cyperus esculentus) is a troublesome, difficult-to-control weed that is often found in turf areas (Figure 1). It is also called chufa, nutgrass, or watergrass. YellowNutsedge (Cyperus esculentus) Control in Home Lawns With Cool Season Turfgrasses. Yellownutsedge is a fast spreading perennial plant in the Cyperaceae family (Image 1)... General Cultural Control. While control of yellownutsedge is difficult in many crops, crop competition can help to minimize its spread. Yellownutsedge is a troublesome, difficult-to-control weed often referred to as nutgrass or watergrass. It is not a grassy weed or broadleaf, but a sedge. Control of yellownutsedge with effective crop rotations. Joel Felix and Joey Ishida, Malheur Experiment Station, Oregon State University, Ontario, OR. EPTC applied as preemergence herbicide controlledyellownutsedge in all treated plots, which was consistent with the control efficacy reported from other field crops (e.g., Ahrens, 1994). One of the most difficult lawn weeds to control goes by several names including nutsedge, nutgrass and water grass. The technical name is yellownutsedge. Yellownutsedge (Cyperus esculentus L.) is a hard to control troublesome weed in North America. A recent survey conducted by the Weed Science Society of America ranked nutsedge... The best method for controllingyellownutsedge (and other weeds) is to grow a healthy, dense, vigorous stand of turf that can compete with weeds. Lawn Care Pro Series: Yellownutsedgecontrol. or black tubers that are about 1/2 inch in diameter at maturity. Only one tuber is formed at the end of a rhizome.