How to Kill Yellow Nutsedge in Bermudagrass Without Hurting Your Lawn
Direct Agronomic Answer
To selectively kill Yellow Nutsedge in Bermudagrass without damaging your turf, apply SedgeHammer+ (Halosulfuron-methyl 5%), Certainty Turf Herbicide (Sulfosulfuron 75%) when air temperatures are between 60°F and 90°F.
Standard broadleaf weed killers (2,4-D) and crabgrass herbicides (Quinclorac) have zero effect on sedges. Halosulfuron inhibits the ALS enzyme system across all 8 cool-season and warm-season turf types, halting growth within 48 hours and causing complete necrosis in 14 to 21 days.
1. Labeled Safe Herbicides That Kill Yellow Nutsedge in Bermudagrass
| Recommended Product | Active Ingredient & Group | Application Temp (°F) | Surfactant & Mixing Protocol | Where to Buy |
|---|---|---|---|---|
| SedgeHammer+ EPA Reg. 81880-24-10163 |
Halosulfuron-methyl 5% Group 2 (ALS Inhibitor / Sulfonylurea) |
60°F – 90°F Rainfast: 4h |
SedgeHammer+ single-scoop pouches already contain a built-in non-ionic surfactant. If using bulk SedgeHammer 75WG, add 2 tsp NIS per gallon. | Check Price at DoMyOwn View on Amazon |
| Certainty Turf Herbicide EPA Reg. 59639-138 |
Sulfosulfuron 75% Group 2 (ALS Inhibitor / Sulfonylurea) |
60°F – 90°F Rainfast: 3h |
Mandatory Non-Ionic Surfactant (NIS) at 1 tsp (0.25% v/v) per gallon of water. Frequently tank-mixed with Celsius WG for complete southern weed control. | Check Price at DoMyOwn View on Amazon |
| Image Kills Nutsedge EPA Reg. 228-719 |
Imazaquin 3.3% Group 2 (ALS Inhibitor / Imidazolinone) |
65°F – 90°F Rainfast: 6h |
Ready-to-mix liquid formulation contains surfactant; additional NIS is not required for standard broadcast or spot treatments. | Check Price at DoMyOwn View on Amazon |
2. What NOT to Spray on Bermudagrass When Treating Yellow Nutsedge
Warning: Common Yellow Nutsedge Killers That Damage Bermudagrass
Many retail herbicides advertised for Yellow Nutsedge are formulated for different turf zones and will severely injure Bermudagrass:
- AVOID Tenacity (Mesotrione 40%): Rated 'avoid_actively_growing' on Bermudagrass — high risk of turf phytotoxicity or stunting.
- AVOID TZone SE (Triclopyr 7.72%, 2,4-D 29.36%, Dicamba 2.22%, Sulfentrazone 0.66%): Rated 'damage_risk' on Bermudagrass — high risk of turf phytotoxicity or stunting.
3. Optimal Seasonal Timing & Temperature Thresholds
Apply Halosulfuron or Sulfosulfuron in early-to-mid summer (June through July) when Yellow Nutsedge has 3 to 8 leaves and soil temperatures are above 65°F, prior to underground tuber hardening.
Never hand-pull Yellow Nutsedge: mechanical pulling breaks the crown and activates 3 to 5 dormant basal bulbs along the rhizome chain. Wait at least 48 hours after mowing so shoots have sufficient leaf area to absorb the herbicide.
4. Diagnostic Checklist: Confirm It Is Yellow Nutsedge Before Spraying
- Stiff, waxy, pale chartreuse-green blades that grow twice as fast as surrounding turfgrass
- Distinctly triangular (3-sided) solid stem cross-section with leaves arranged in ranks of three
- Golden-brown bottle-brush seedheads and underground pea-sized tubers (nutlets) on rhizome tips
Not 100% sure? Use our AI Photo Weed Scanner or review the full Yellow Nutsedge Botanical Profile.