The label is the law. Read your product's label before you mix or apply; the rates here come from the labels listed under Sources.
- Active ingredient
- Dicamba (as the diglycolamine salt) (CAS 1918-00-9)
- Chemical class
- Benzoic acid; WSSA Group 4 synthetic auxin.[2]
- Mode of action
- WSSA Group 4: Synthetic auxins (benzoic acids)[2]
- Signal word
- Vanquish Herbicide: Caution[1]
Dicamba in lawn weed killers
Vanquish's turf directions include tank mixes with 2,4-D, MCPA or MCPP; 2,4-D, MCPA and MCPP, like dicamba, are WSSA Group 4 synthetic auxins.[1][2]
Where it is used
It can injure trees, shrubs, flowers, fruit trees, grapes, tomatoes, beans and other broadleaf plants through contact with roots, stems or leaves. Don't treat where it can wash or move through soil to the roots of trees and shrubs.[1]
Where roots of sensitive plants extend, the label caps the rate at ¼ pint per acre on sandy soils and ½ pint on clay soils, with no repeat for 30 days.[1]
Wait until after the second mowing on newly seeded grass. Rates above 1 pint per acre can stunt or discolor bentgrass, carpetgrass, buffalograss and St. Augustinegrass.[1]
Use large droplets, spray in winds of 3 to 10 mph, and never during a temperature inversion.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Vanquish Herbicide[1] | Syngenta Crop Protection, LLC | 100-884 | 58.1% | liquid concentrate | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Vanquish Herbicide | Established lawns, golf course fairways and roughs, parks, sod farms | Annual, biennial and perennial broadleaf weeds, including clovers, dandelion and spurge | 1–4.5 teaspoons product per 1,000 sq ft[1] 1 to 2¼ tsp for small annual weeds, 2¼ to 3¼ tsp for established annuals, and 2¼ to 4½ tsp for perennials, brush and vines, in 3 quarts to 4¼ gallons of water per 1,000 sq ft. A second application may follow after 30 days; no more than 4 pints per acre per year. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if swallowed or absorbed through the skin and causes moderate eye irritation.[1]
Pets
The label's hazards to humans and domestic animals are swallowing, skin absorption and eye irritation; avoid contact with skin, eyes or clothing.[1]
Bees and pollinators
The label's chief nontarget warning is injury to desirable broadleaf plants from drift or root uptake.[1]
Fish and water
Don't contaminate water, food or feed by storage or disposal, and clean spray equipment thoroughly.[1]
Common questions
- Can dicamba hurt my trees?
- Yes. The label warns it can injure trees and shrubs if it reaches their roots through soil movement or runoff, and limits rates where roots extend.[1]
- How much dicamba per 1,000 square feet?
- 1 to 4½ teaspoons of Vanquish, depending on weed size and type.[1]
- How soon can I spray new grass?
- Wait until after the second mowing of newly seeded grass.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Vanquish Herbicide label, EPA Reg. No. 100-884 (EPA-stamped, May 17, 2017).” www3.epa.gov/pesticides/chem_search/ppls/000100-00884-20170517.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)