Tenacity Herbicide

Tenacity Herbicide is a systemic pre-emergent and post-emergent weed killer. Its active ingredient is mesotrione 40%, known for its selective contact and residual control of turfgrass weeds.

When used as a pre-emergent, this product is absorbed by weeds as they emerge from the soil. When used as a post-emergent, Tenacity is absorbed by the targeted weed through foliar contact.

Tenacity Herbicide can also provide excellent control of crabgrass and many other weeds in residential yards. This is important because the EPA has banned MSMA for homeowners or residential use.

Tools Needed

Tenacity Herbicide can be applied with a pressurized hydraulic sprayer, high-volume handgun spray, handheld pump sprayer, or backpack sprayer.

How to Use

• Step 1: Determine how much Tenacity Herbicide to use by measuring the square footage of the treatment area. You must measure the treatment areas' length and width in feet, then multiply them together (length x width = square footage). You will also need to determine the species of turf the weed is on before application, as this will affect the application rate. The typical application rate for large areas is 4 to 8 fluid ounces per 30 gallons of water per acre. For smaller areas and spot treatments, a half teaspoon of Tenacity in 1 gallon of water will treat 1,000 square feet. For example, if your area is 2,000 sq. ft., mix one teaspoon of Tenacity with 2 gallons of water.
• Step 2: Fill your sprayer with half the amount of water, add a measured amount of Tenacity Herbicide, and then pour in the remaining half. Close the spray tank lid and shake until the product has fully dissolved and thoroughly mixed.
• Step 3: Once your solution is complete, apply Tenacity Herbicide selectively to the target weed, being sure not to over-apply to the point of runoff. Use a fan-spray nozzle setting for even coverage. Repeat application in 2 to 3 weeks for best results.

Where to Use

Tenacity Herbicide is used for weed control in turfgrasses in residential and commercial sites, golf courses (excluding putting greens with a 5-foot buffer), sod farms, athletic fields, parks, cemeteries, airports, and lawns.

When to Use

Use Tenacity during the growing season when unwanted weeds are on the property. Tenacity pre-emergent applications must be done in the fall and early spring. For post-emergent applications, it is best to apply Tenacity herbicide to young, actively growing weeds, and a second application may be required after 2 to 3 weeks.

Safety Information

Tenacity Herbicide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.

Pets and children should not be present during treatment and remain out of the treated areas until completely dried.

Special Considerations

Bentgrass, Poa annua, Kikuyu grass, zoysiagrass, seashore paspalum, and bermudagrass are sensitive to Tenacity mesotrione herbicide applications. Avoid spraying these turf types unless control can be tolerated. Avoid overspray onto ornamental plants or flower beds and gardens. Roses and daylilies are sensitive plant species.

A surfactant with Tenacity is recommended to improve weed control and provide a better stick to the weeds' leaf surfaces.