Tenacity Herbicide may be applied when soil temperatures are around 55 degrees or higher. Do not apply when air temperature exceeds 85 degrees.
In general, we would recommend killing the undesirable plants and clearing out the dead plant debris before dethatching and then reseeding the lawn. Dethatching will be easier and you will get better germination with your new seed when the ground is better prepared for it. You can learn more about these treatments in our Do My Own Lawncare Video Series, too. You can find them on the bottom of our Lawn Care Guides page here.
Tenacity is an effective herbicide for weed control prior to or during seeding of certain turfgrasses during turf renovation. Please see section on use in New Seedings in the Product Label for complete instructions and limitations for your specific turf type.
Tenacity will keep for 3-5 years from the date of purchase if stored away from extreme temperatures. If yours was purchased in 2013 it may still be good. You may wish to contact the manufacturer directly to see what they recommend. You can reach Syngenta by calling 800-334-9481.
According to the Tenacity product label, you will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments applied at a rate of 1 gallon per 1,000 sq ft.
According to the Tenacity product label you will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments applied at a rate of 1 gallon per 1,000 sq ft. If you can acurrately measure a smaller amount it could be halved to do 500 sq ft but anything smaller would not be recommended.
According to the Tenacity product label you will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments. You will not apply more than 5-8 ounces of Tenacity per acre as a broadcast application. Please click on the product label link for mixing and applications according to the type of turfgrass you have.
We do always recommend that only mix the amount of Tenacity Herbicide you can use at a time. To dispose of any remaining you would not pour down any drain, but can use to go over some of the areas you were treating or you can pour into the dirt right next to the foundation of the home to prevent any run off to the nearby creek.
Tenacity Herbicide should not be used within 3 feet of desirable trees or ornamentals. If treating actively growing grassy weeds, Fertilome Over The Top II Grass Killer can be used. The manufacturer recommends that you use caution during application because the spray can cause damage if it comes into direct contact with foliage.
You can view the full list of weeds controlled by Tenacity Herbicide on page 3 of the product label here. There are separate colums for pre-emergent and post-emergent control.
As long as you are not applying over the well and keeping applications at least 15 feet away from the well, Tenacity Herbicide can be used if you have well water.
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.
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.
Yes, when using Tenacity Herbicide as a post-emergent herbicide you would add a non-ionic surfactant to the water mix.
For best results, it is recommended not to mow within 2 days before or after application of Tenacity Herbicide.
Tenacity Herbicide should be used when the temperatures are consistently above freezing on a daily basis. Your target temperature range will depend on whether you are using Tenacity for pre-emergent or post-emergent applications. Please consult the product label for complete application instructions.
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.