How to Kill Green Kyllinga in Zoysiagrass Without Hurting Your Lawn
Direct Agronomic Answer
To selectively kill Green Kyllinga in Zoysiagrass without damaging your turf, apply SedgeHammer+ (Halosulfuron-methyl 5%), Certainty Turf Herbicide (Sulfosulfuron 75%) when air temperatures are between 60°F and 90°F.
Kyllinga forms aggressive mats under close mowing. Two applications of SedgeHammer 4 to 6 weeks apart destroy the extensive rhizome network.
1. Labeled Safe Herbicides That Kill Green Kyllinga in Zoysiagrass
| 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 |
3. Optimal Seasonal Timing & Temperature Thresholds
Treat in early summer when daytime temperatures reach 70°F–85°F and plants are actively growing.
Ensure a non-ionic surfactant is included in the mix to coat the shiny waxy foliage.
4. Diagnostic Checklist: Confirm It Is Green Kyllinga Before Spraying
- Low-growing, mat-forming perennial sedge with dark green triangular stems
- Sweet, aromatic fragrance emitted from creeping rhizomes when crushed
- Single, compact, globe-shaped green seedhead subtended by three long leafy bracts
Not 100% sure? Use our AI Photo Weed Scanner or review the full Green Kyllinga Botanical Profile.