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
- Fluroxypyr (as the 1-methylheptyl ester)
- Chemical class
- Pyridine carboxylic acid; WSSA Group 4 synthetic auxin herbicide.[2][1]
- Mode of action
- WSSA Group 4: Synthetic auxins (pyridine carboxylic acids)[2][1]
- Signal word
- Vista Ultra Specialty Herbicide (alternate brand name Vista XRT): Warning[1]
Which lawn grasses tolerate fluroxypyr
Listed cool-season grasses are Kentucky bluegrass, tall fescue, fine fescues, perennial ryegrass and bentgrass. Listed warm-season grasses are bahiagrass, bermudagrass, centipedegrass, zoysiagrass and St. Augustine grass.[1]
Bentgrass and bermudagrass get only the lowest 6 fl oz per acre rate, and only if some injury is acceptable. Warm-season grasses are capped at 11 fl oz per acre unless you accept injury, and should not be sprayed while greening up from dormancy.[1]
St. Augustine grass limits
The label bars any use on St. Augustine grass in Florida. Elsewhere, St. Augustine gets no more than 6 fl oz per acre and no treatments between April 1 and October 31.[1]
Where it is used
Spray weeds that are up and actively growing; only emerged weeds are controlled. Activity is best between 55°F and 85°F, drops below 45°F, and frost within 3 days before or after can reduce results.[1]
The spray is rainfast within 1 hour, but control may drop if foliage is wet when you apply.[1]
Treat only well-established grass. Mow newly seeded turf two or three times first, wait 3 weeks after spraying before reseeding, and space repeat treatments at least 4 weeks apart unless some injury is acceptable.[1]
Keep spray off exposed suckers or roots of shallow-rooted trees and shrubs, and never use it on golf greens or tees.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Vista Ultra Specialty Herbicide (alternate brand name Vista XRT)[1] | Corteva Agriscience, LLC | 62719-586 | 45.52% | emulsifiable liquid | Warning |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Vista Ultra Specialty Herbicide (alternate brand name Vista XRT) | Established lawns, golf course turf (not greens or tees), sod farms, recreational and public turf | Chickweed, white clover, ground ivy, common lespedeza, black medic, slender speedwell, woodsorrels, dandelion, plantains, henbit, spotted spurge, hop clover, prostrate knotweed; dollarweed suppression | 0.14–0.59 fl oz product per 1,000 sq ft[1] Mix in at least 1 gallon of water per 1,000 sq ft. Bedstraw, purple deadnettle and purslane need only 0.14 to 0.19 fl oz; most listed weeds 0.19 to 0.25 fl oz; dandelion, henbit, plantains, spotted spurge and hop clover take the full 0.59 fl oz. No more than 23 fl oz per acre per year. |
Safety and environmental hazards
People
Signal word WARNING: the concentrate causes substantial but temporary eye injury, and repeated skin contact may cause allergic reactions in some people. Wear protective eyewear, long sleeves and pants, shoes with socks, and chemical-resistant gloves such as natural rubber over 14 mils.[1]
Pets
Keep people other than the applicator, and pets, off the treated area during application, and stay out until the spray has dried.[1]
Bees and pollinators
The label has no bee or pollinator warning. Its environmental cautions are about fish, other aquatic life and non-target plants reached by drift or runoff.[1]
Fish and water
Toxic to fish. Don't apply directly to water or where surface water is present, and don't contaminate water when cleaning equipment.[1]
Common questions
- Does fluroxypyr kill clover?
- Yes. White clover is on the turf list at 0.19 to 0.25 fl oz per 1,000 sq ft, and hop clover at the full 0.59 fl oz rate.[1]
- How soon can I reseed after spraying Vista XRT?
- The label says not to reseed turfgrass for three weeks after application.[1]
- Will fluroxypyr kill grass?
- It's selective on the listed lawn grasses at labeled rates, but bentgrass, bermudagrass and St. Augustine have tighter limits, and greening-up warm-season turf can be delayed.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Vista Ultra Specialty Herbicide (Vista XRT) label, EPA Reg. No. 62719-586 (EPA-stamped, Dec. 5, 2013).” www3.epa.gov/pesticides/chem_search/ppls/062719-00586-20131205.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)