The label is the law. Rates and restrictions below are taken from the product labels listed under Sources. Your product's own label governs; read it before you mix or apply. Mixing calculator · Disclaimer
- Active ingredient
- Sulfentrazone
- Chemical class
- Triazolinone; WSSA Group 14 PPO (protoporphyrinogen oxidase) inhibitor, taken up by both roots and shoots.[2][1]
- Mode of action
- WSSA Group 14: PPO inhibitors (triazolinones)[2][1]
- Signal word
- Sulfentrazone 4F ROW Herbicide (alternate brand names include Dismiss Turf Herbicide): Caution[1]
Bulbs, perennials and landscape plants
Sulfentrazone stays active in the soil, so don't apply it where ornamental bulbs or dormant non-woody perennials are planted; they can be damaged when they emerge.[1]
Around shrubs, aim the spray at the soil at the base of the plant, never over the top. If leaves get hit, overhead irrigation can wash it to the soil. It is not for food-producing trees, vines or plants.[1]
Discoloration on some lawns
St. Augustinegrass and some zoysiagrass, bahiagrass and rough bluegrass cultivars may show temporary leaf discoloration. The label says new growth recovers and mowing removes the discolored tissue.[1]
Where it is used
For crabgrass, spurge, purslane and other summer annuals, apply before seeds germinate in early spring. For winter annuals such as annual bluegrass, chickweed and henbit, apply in late summer or early fall.[1]
Against sedges, use the highest rate allowed for your grass type. Yellow nutsedge is the most susceptible; purple nutsedge does best with a split program, the second spray about 35 days after the first.[1]
Skip the surfactant. The label says additives can temporarily discolor some turf, especially in heat and high humidity, and does not recommend them.[1]
On new turf, wait until after the second mowing and a uniform, well-rooted stand. Reseeding within a month of application may keep the new grass from establishing.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Sulfentrazone 4F ROW Herbicide (alternate brand names include Dismiss Turf Herbicide)[1] | FMC Corporation (registrant named on the July 18, 2024 stamped label) | 101563-284 | 39.6% | flowable suspension concentrate (4 lb sulfentrazone per gallon) | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Sulfentrazone 4F ROW Herbicide (alternate brand names include Dismiss Turf Herbicide) | Established warm-season turf: bermudagrass, zoysiagrass, St. Augustinegrass, centipedegrass, bahiagrass, buffalograss and others | Yellow and purple nutsedge, kyllinga, annual sedges, spurge, crabgrass (pre), clover, dandelion, oxalis and other listed weeds | 0.18–0.275 fl oz product per 1,000 sq ft[1] That's 8 to 12 fl oz per acre. Sprays go out in 0.5 to 4 gallons of water per 1,000 sq ft, and the single-application ceiling of 12 fl oz per acre also equals the yearly limit. |
| Sulfentrazone 4F ROW Herbicide (alternate brand names include Dismiss Turf Herbicide) | Established cool-season turf: Kentucky bluegrass, tall and fine fescue, perennial ryegrass; creeping bentgrass at the low rate | Sedges and the same listed broadleaf and annual weeds | 0.092–0.18 fl oz product per 1,000 sq ft[1] That's 4 to 8 fl oz per acre; creeping bentgrass is limited to 0.092 fl oz per 1,000 sq ft (4 fl oz per acre). Some fine and tall fescue cultivars may be injured. |
| Sulfentrazone 4F ROW Herbicide (alternate brand names include Dismiss Turf Herbicide) | Container and field grown ornamentals and established landscape plants (directed spray to the soil at the base) | Listed annual and broadleaf weeds and sedges | 0.092–0.275 fl oz product per 1,000 sq ft[1] Use the upper end, 8 to 12 fl oz per acre, for sedges and perennial weeds. Multiple applications are allowed as long as the year's total stays at or under 12 fl oz per acre. |
Safety and environmental hazards
People
Signal word CAUTION: causes moderate eye irritation and is harmful if inhaled, swallowed or absorbed through the skin. Applicators wear long sleeves, long pants, waterproof gloves, shoes and socks.[1]
Pets
For lawn and landscape use, don't let people other than the applicator, or pets, onto the area during application, and stay off it until the spray has dried.[1]
Bees and pollinators
The label has no bee-specific warning. Its environmental hazards name non-target plants and aquatic invertebrates, and it warns that drift can spot or damage sensitive plants.[1]
Fish and water
Toxic to aquatic invertebrates and can reach water through drift or runoff for months. Don't use it on sand with under 1% organic matter, or mix and load it within 50 feet of wells or surface water.[1]
Common questions
- Does sulfentrazone kill nutsedge?
- Yes. Yellow and purple nutsedge, green and false green kyllinga and several other sedges are on the label, with yellow nutsedge the most susceptible.[1]
- Can I use sulfentrazone on St. Augustine grass?
- Yes, at 0.18 to 0.275 fl oz per 1,000 sq ft. Expect some temporary discoloration of exposed leaves that grows out.[1]
- How soon can I overseed after sulfentrazone?
- Wait about a month: reseeding, overseeding or sprigging within 1 month may inhibit new turf. Bermudagrass can be overseeded with perennial ryegrass 2 to 4 weeks after if slight injury is acceptable.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Sulfentrazone 4F ROW Herbicide label, EPA Reg. No. 101563-284 (EPA-stamped, July 18, 2024).” www3.epa.gov/pesticides/chem_search/ppls/000279-03295-20240718.pdf (accessed 2026-10-06). The stamped label and EPA file name carry the former registration number 279-3295 (FMC Corporation).
- Weed Science Society of America, “Summary of Herbicide Mechanism of Action According to the Weed Science Society of America.” wssa.net/wp-content/uploads/WSSA-Mechanism-of-Action.pdf (accessed 2026-10-06)