Stressful weather conditions throughout the summer have created a long list of agronomic challenges, including yellow nutsedge and false green kyllinga encroachment. Excessive rainfall and high temperatures have created ideal conditions for these weeds to gain a foothold. Their rapid growth leads to playability issues, and their light green appearance is an unsightly contrast with the desired turf.
Identification is important for managing these weeds because some herbicides are labeled for yellow nutsedge control but not false green kyllinga. A safe bet is to choose an herbicide that is labeled for both, like imazosulfuron (Celero), carfentrazone-ethyl + sulfrentrazone (Dismiss NXT) or pyrimisulfan (Arkon).
Numerous applications over multiple years are often necessary to achieve control. If fall applications are being made to control these weeds, plan to make follow-up applications in early summer of 2026. Scientists at Purdue University and Rutgers University suggest postemergence herbicide applications in early summer when the plants are young and their underground structures are undeveloped. Additionally, be sure to map areas where encroachment has occurred so early summer applications are made in the proper locations.
The Green Section Record article “Nutsedge and Kyllinga Control Strategies” is a good resource for developing a control program for both of these weeds. For more information on setting up a fall weed control program, reach out to your regional USGA agronomist.
Central Region Agronomists:
Zach Nicoludis, regional director, Central Region – znicoludis@usga.org
Tom Gould, agronomist – tgould@usga.org