Tenacity Herbicide - Questions & Answers

You can reapply Tenacity Herbicide when the newly germinated turf has been mowed two to three times or four weeks after emergence, which is longer. Repeat applications can be done after two to three weeks for continued post emergent weed control.

Yes, when using Tenacity Herbicide as a post-emergent herbicide you would add a non-ionic surfactant to the water mix.

Wiregrass is a form of bermudagrass.  The product label states that bermuda grass is sensitive to Tenacity but it would not be recommended as a product specifically used to kill it.  Fusilade II can be used to get rid of bermuda grass in tall fescue.  Please be advised that bermuda grass is extremely difficult to control and you will likely need to make several applications. 

Tenacity is not labeled to control Poa Annua/Annual Bluegrass, it only states that it could cause injury to it if sprayed with tenacity. Since it is not specifically designed to control Poa Annua, a better product choice would be Echelon 4SC. Echelon 4SC is labeled for pre-emergent control of poa annua only. According to the product label Poa annua is a winter annual. Applications of Echelon 4SC Herbicide should be made in August or September to established, non overseeded turf before Poa Annua germinates. Consult your local Cooperative Extension Service for more specific applications timings for your local area since August and September are approximate timings.

Tenacity Herbicide  could pose a discoloration if it gets on the bark. You want to try and make the application on a day that is not very windy. According to the Tenacity product label you will need to mix 1/2 tsp of product + 1 1/2 tsp surfactant with 1 gallon of water. Tenacity will also act as a pre emergent for listed weeds.

Tenacity Herbicide is our most popular product for eliminating bentgrass from other desirable turfgrasses, but it does typically require multiple applications. Late summer/Fall applications will be more effective than Spring applications.

For best results, it is recommended not to mow within 2 days before or after application of Tenacity Herbicide.

Tenacity Herbicide will not kill poison oak. Please see Bonide Poison Oak and Ivy Killer, which is designed just for poison oak and ivy.

Per the product label on Tenacity Herbicide, apply at grass seeding or close to seeding for best preformance. If you are not close, meaning within a week of application, then you would need to wait 6-8 weeks to re-seed, As for your questions is it too late ot re-seed, we recommend you contact a master gardener in your area or your Local Extention Office to get more information on that. 

Tenacity Herbicide can take multiple applications to be most effective.  It does not require irrigation after application for post-emergent weed control. Are you mixing a surfactant like Non Ionic Surfactant? This helps the product to stick and penetrate to the xylem of the plant best. Be sure the target weeds are listed on the Tenacity product label.

You could potentially mix Tenacity Herbicide with other products as long as you follow both product labels to be sure you are using the correct rates for the area you want to treat. We also recommend checking the labels first if you are planning on seeding or have recently done so. We also suggest a small jar test before mixing a large batch to check for compatability. 

Tenacity Herbicide is our most popular product for eliminating bentgrass from other desirable turfgrasses, but it does typically require multiple applications. Late summer/Fall applications will be more effective than Spring applications.

For bentgrass control, Tenacity Herbicide should be applied at 2-3 week intervals for up to 3 applications.  

Yes, chelated iron can be used after using Tenacity Herbicide 

Once the application of Tenacity Herbicide has had time to dry it is safe for pets and children to reenter the treated area. Typically after 4-6 hours.  The small amount of active left is not enough to injure a dog that may eat the rass.

 

To control nimblewill, you should start applying Tenacity Herbicide in the spring (late-April). You will need to make two or three applications to get complete control.  You can also apply Tenacity in late summer and fall, but you should initiate treatments by August for best results. 

If you are spot treating, you will need to use 1 tsp. of Tenacity along with 3 tsp. Non Ionic Surfactant in 2 gallons of water per 1,000 sq. ft.  Otherwise apply Tenacity at 5 fl. oz. per acre in at least 30 gallons of water per acre.

If it takes one gallon of water to cover 1,000 sq ft then use one gallon of water to the appropriate amount of products. If it takes 2 gallons of water, you will still use the same amount of Tenacity and surfactant. The water is the carrier so that amount of product is applied over the full 1,000 sq ft.

No, Tenacity Herbicide will not kill or eliminate orchard grass, quackgrass or tall fescue.

Tenacity will help control annual bluegrass (poa annua) from germinating in the Fall, but it will not interfere with new plantings of Kentucky Bluegrass. If you are putting down any new seed, apply Tenacity as close to seeding as possible. If you have new KBG seedlings coming up already, then wait to apply Tenacity until after the new grass is established (2 mowings or four weeks, whichever is longer).

You can use Tenacity Herbicide before or at the same time as seeding with most cool-season turf. So if you are overseeding with tall fescue or bluegrass, for example, then you can put down the seed anytime after apply Tenacity. If there is dead plant matter, then it is always a good idea to remove the dead plants before overseeding to help the new seeds reach the soil and establish. You can apply extra top soil as needed before seeding.