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
- Fenoxaprop-P-ethyl
- Chemical class
- Aryloxyphenoxypropionate ('fop'); WSSA Group 1 acetyl CoA carboxylase (ACCase) inhibitor.[2][1]
- Mode of action
- WSSA Group 1: Acetyl CoA carboxylase (ACCase) inhibitors (aryloxyphenoxypropionates)[2][1]
- Signal word
- Acclaim Extra Herbicide: Caution[1]
Which lawns can take it
The label lists Kentucky bluegrass, perennial ryegrass, fine and tall fescue, annual bluegrass, zoysia and certain bentgrass varieties. In the turf directions, bermudagrass shows up not as a tolerant lawn grass but as a perennial weed that Acclaim Extra temporarily suppresses.[1]
Bentgrass must be established for a full growing season and mowed no lower than ¼ inch, and putting greens are off limits. Rapidly growing Kentucky bluegrass may yellow or stunt for a while before recovering.[1]
Ornamentals that tolerate it, and some that don't
Azalea, boxwood, hollies, hosta, daylily, roses and many other shrubs and flowers appear on the tolerant list. The label warns of plant injury on Bar Harbor juniper, philodendron, salvia, podocarpus and pittosporum.[1]
Where it is used
It only kills grass that has already emerged, and young, actively growing weeds die more easily than big tillered clumps. Expect yellowing or reddening in 4 to 10 days and full kill in 12 to 21 days.[1]
Leave the treated lawn unmowed for at least 24 hours, and let the spray dry for at least an hour before rain or irrigation. Water a drought-stressed lawn a day or two ahead instead of spraying it dry.[1]
Keep 2,4-D and MCPP away from it: don't spray fenoxaprop within 21 days after either one, or within 5 days before one, because those broadleaf herbicides can weaken grass control.[1]
Fescues and ryegrass can be overseeded right after an application, but other turf species need a 21-day wait. Don't spray sod within 4 weeks of cutting or transplanting.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Acclaim Extra Herbicide[1] | Bayer Environmental Science (a division of Bayer CropScience LP) | 432-950 | 6.59% | water emulsion (0.57 lb fenoxaprop-P-ethyl per gallon) | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Acclaim Extra Herbicide | Established Kentucky bluegrass, perennial ryegrass, fescues, zoysia and listed bentgrass turf; landscape ornamentals | Smooth and large crabgrass, goosegrass, barnyardgrass, foxtails, sandbur, Japanese stiltgrass and other annual grasses | 0.08–0.9 fl oz product per 1,000 sq ft[1] The dose climbs with weed size: 0.30 fl oz for untillered grass, 0.46 at 1 to 2 tillers, 0.64 at 3 to 4 tillers and 0.90 at 4 to 5 tillers. Kentucky bluegrass and zoysia top out at 0.64. Bentgrass gets 0.08 on 14- to 21-day repeats. |
| Acclaim Extra Herbicide | Spot spraying grassy weeds with a hand-held pump sprayer | Crabgrass, goosegrass and other listed annual grasses | 0.3–0.46 fl oz product per gallon of water[1] Use 0.30 fl oz per gallon while the weed has 1 to 4 leaves and 0.46 fl oz once it has 1 or 2 tillers. Wet the weeds to the point of runoff; a surfactant improves coverage. |
Safety and environmental hazards
People
Signal word CAUTION: causes moderate eye irritation and is harmful if swallowed. Applicators wear a long-sleeved shirt, long pants, shoes and socks. The concentrate contains petroleum distillates.[1]
Pets
Under the label's hazards to humans and domestic animals, the concerns are eye irritation and swallowing. On lawns and landscapes, keep unprotected people out of the treated area until the spray has dried.[1]
Bees and pollinators
The Acclaim Extra label carries no bee or pollinator warning; its environmental statement is about fish and aquatic invertebrates.[1]
Fish and water
Toxic to fish and aquatic invertebrates. Don't apply directly to water or where surface water is present, and hold off when weather favors runoff or drift.[1]
Common questions
- Will Acclaim Extra kill broadleaf weeds or nutsedge?
- No. The label says it has little or no activity on broadleaf plants and sedges, so it only takes out grassy weeds.[1]
- How often can fenoxaprop be reapplied?
- Wait at least 14 days between applications and stay under 2.75 fl oz per 1,000 sq ft per year. For bermudagrass suppression the label repeats every 28 to 35 days.[1]
- Can I use it on newly seeded grass?
- Only with care. Kentucky bluegrass seedlings must be tillered and up for a month at the lowest rate, and young fescue or ryegrass under 4 weeks old should not be sprayed.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Acclaim Extra Herbicide label, EPA Reg. No. 432-950 (EPA-stamped, Aug. 24, 2016).” www3.epa.gov/pesticides/chem_search/ppls/000432-00950-20160824.pdf (accessed 2026-10-06)
- 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)