If Tenacity Herbicide or any herbicide is exposed to extreme freezing or heat temperatures, the concentrate can and would lose efficacy. When stored in cool dry and temperature controlled environments, the shelf life is 3-5 years.
Tenacity Herbicide can be used both in spring and fall for pre emergent control of weeds when soil temps are around 55 degrees. Tenacity is one of the top pre emergents for cool season turfgrasses in fall and can be applied at the same time as overseeding without inferferring with grass seed germiantion.
For post emergent control of actively growing weeds, a Non Ionic Surfactant is required to be added to tank mix. Post emergent applicaitons can be applied anytime the weeds are actively growing. Please refer to the list of Weeds Controlled on the product label for information on pre/post emergent control of targeted weeds.
Tenacity is not usually applied in December since it is most often applied to cool season turfgrasses, and it would be too cold in December to use herbicides in most areas with these turfgrasses. Whether Tenacity will work for your needs will depend on the type of desirable turfgrass you have and what specific weeds you are targeting. Tenacity is not safe to use on St. Augustine, zoysia, or Bermuda grass lawns.
Tenacity is usually applied as a pre-emergent in the fall or spring before overseeding with cool season grass such as rye or fescue. As a post-emergent, you would only spot treat with Tenacity as directed on the product label since this product can cause temporary whitening on desirable turfgrass.
Tenacity Herbicide can be applied as a pre-emergent before or at the same as seeding. We recommend that you only apply Tenacity after seeding if you can make the application within 7 days of seeding. Otherwise, you would need to wait until the new grass has come up and been mowed at least twice.
Tenacity Herbicide can be applied to dormant bermudagrass only without injuring the bermudagrass. However, a better product would be Negate 37WG.
Negate 37WG can be used on dormant or growing turf for listed weeds as directed on the product label.
Tenacity Herbicide is applied at 4 - 8 oz. per 30 gallons of water per acre. This means 1 kit could cover 1-2 acres.
Bentgrass control may be more effective in the late summer/early fall just prior to onset of renewed bentgrass growth, than spring/early summer applications. We recommend contacting your local cooperative extension office and speak with the master gardener in your area for advice for specific timing in your area.
Tenacity Herbicide is not labeled for perennial peanut also known as "Florida Alfafa". Grass Out Max is labeled for perennial peanut for control of grassy weeds. 2,4-D Amine Herbicide is labeled for this weed around specific crops. Please view the product label here for more information.
We also recommend contacting your local Master Gardener with the Cooperative Extension Office for recommendation proven to be effective in your area.
As you probably know, Centipedegrass is a very sensitive species of turf so many products that eliminate the crabgrass and other weeds can also cause damage to your lawn.
Tenacity is a great pre-and post-emergent herbicide that will control crabgrass along with many other types of weeds and listed safe for centipede lawns. When used for post emergent control of actively growing weeds, a non ionic surfactant is recommended for best results. The surfactant is not needed for pre emergent applications. Turf Mark Blue can be tank mixed to allow you to see where you have treated and to ensure thorough coverage and avoid overlapping.
Review the Tenacity product label and apply as directed to avoid possible injury to your turfgrass. Keep in mind, this is a strong herbicide so any overmixing, overapplying or applying when centipede is transition in or out of dormancy can injure the lawn. Some whitening of the weeds and turfgrass is normal as this is part of the weed killing process, but the color will return in 3-4 weeks at most or after the next 1-2 mowings.
Tenacity Herbicide is not labeled safe to use on bentgrass and per the product label can cause injury.
Please refer to the product label if more information is needed.
Tenacity Herbicide is not labeled to control torpedograss.
Drive XLR8 is labeled for torpedograss in Bermuda grass, Kentucky bluegrass, Buffalo grass, Fescue, Ryegrass, and Zoysiagrass. A Methylated Seed Oil Surfactant is recommended to be used for best results.
Per subnote 3 on page 9 of the Drive XLR8 product label, “Make 2 sequential applications of 1 fl oz per 1000 sq ft and an additional sequential applicaiton up to 0.9 fl oz per 1000 sq ft at 14-21 day intervals.”
Yes, you can apply Tenacity Herbicide to dormant centipede grass. Make sure to read and review the Tenacity product label very carefully and mix exactly what is recommended as this is a strong product and mis-using it can cause temporary turf injury.
When applying Tenacity it is highly recommended to use a temporary turf colorant like Turf Mark Blue to allow you to see where you are spraying. Overlapping your application of Tenacity can cause temporary whitening of the lawn as well, but the color will return in 3-4 weeks at most.
Tenacity Herbicide is labeled to control foxtail both as a pre emergent before weeds germinate and as a post emergent when foxtail is actively growing. For post emergent applications, a non ionic surfactant is needed to be used in the tank mix.
View the full product label for more information.
Tenacity Herbicide is only labeled to be used on Bermuda when it is dormant, otherwise it can be sensitive to applications and could harm it. Since Tenacity Herbicide can be used only on fully dormant Bermudagrass, there is not a time when you would be overseeding and using Tenacity at the same time. You would overseed with Bermuda when the turf is actively growing in spring or summer, if needed at all. So if you applied Tenacity on dormant Bermuda, then it would be long gone by the time the turf is completely green and any seeding would be done. If you would like to tell us more about the weeds you are targeting, then we can recommend alternate products for your needs.
Tenacity Herbicide should be applied on a non-windy day as directed on the label.
To control nimblewill, start applying Tenacity in the spring (late-April) with a nonionic surfactant. You will need to make two or three applications 2-3 weeks apart. You will use it at the 5 oz per acre rate per the label. The product does have a yearly maximum use rate, and the label states "do not apply more than 16 oz of Tenacity per acre per year or per crop (equivalent to a maximum of 0.50 lb of mesotrione per acre per year).You can also apply Tenacity in late summer and fall, but you should initiate them by August for best results. Good cultural practices on your lawn can help reduce its ability of coming back as well.
Tenacity Herbicide can be applied at the same time as seeding (unless grass is more than 20% stand of fine fescue). If application cannot be done within 7 days of seeding you would need to wait a minimum of 30 days, or until the seed has emerged and been mowed at least twice before applying to the lawn.
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. It is advised to use a dye like Turf Mark Blue with it so you can make sure to not overlap if you plan to do a broadcast application on the property. Repeat applications can be done after two to three weeks for continued post emergent weed control.
Ideally, you would not want to put a fertilizer down when the lawn is getting ready to go dormant. If anything, an application could be made now in early October as your last treatment for the year. Tenacity would not be effective on lespedeza (japanese clover) at all as its not labeled for it. Southern Ag Atrazine is labeled for lespedeza and is safe for use on Centipede lawns if used as directed. Another option is Fertilome Weed Free Zone.
Tenacity Herbicide is not labeled for clump fescue, and it is safe for tall fescue.
