How to Kill Torpedograss in Zoysiagrass Without Hurting Your Lawn
Direct Agronomic Answer
To selectively kill Torpedograss in Zoysiagrass without damaging your turf, apply Drive XLR8 (Quinclorac 18.92%) when air temperatures are between 60°F and 85°F.
Torpedograss is nearly impossible to remove selectively from St. Augustine or Centipede without killing the turf. Multiple Quinclorac applications with MSO suppress rhizomes in Bermuda.
1. Labeled Safe Herbicides That Kill Torpedograss in Zoysiagrass
| Recommended Product | Active Ingredient & Group | Application Temp (°F) | Surfactant & Mixing Protocol | Where to Buy |
|---|---|---|---|---|
| Drive XLR8 EPA Reg. 7969-272 |
Quinclorac 18.92% Group 4 (Synthetic Auxin / Quinoline Carboxylic Acid) |
60°F – 85°F Rainfast: 1h |
Requires Methylated Seed Oil (MSO) surfactant at 1.5 tbsp (0.75 fl oz) per gallon of water for effective cuticle penetration on multi-tiller crabgrass. | Check Price at DoMyOwn View on Amazon |
3. Optimal Seasonal Timing & Temperature Thresholds
Apply in late spring and summer during vigorous active growth, repeating after 21 days.
Never cultivate or till soil infested with Torpedograss as chopped rhizome fragments spread the infestation.
4. Diagnostic Checklist: Confirm It Is Torpedograss Before Spraying
- Stiff, hard, sharp, torpedo-like pointed rhizome tips that punch through sod and weed fabrics
- Linear, flat or folded pale blue-green blades with fine hairs on upper surface
- Open, loose, panicle-type seedhead with branches pointing upward
Not 100% sure? Use our AI Photo Weed Scanner or review the full Torpedograss Botanical Profile.