Tenacity Herbicide

$63.50

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4.5 out of 5 stars Rating: 4.6

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Tenacity Herbicide bottle (8 oz)

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Tenacity Herbicide

Tenacity is a systemic pre-emergence and post-emergence herbicide for the selective contact and residual control of weeds in turfgrasses. When applied as a pre-emergent, weeds absorb Tenacity during emergence from the soil. Dry conditions following application may reduce the pre-emergence activity. If rainfall (0.15 inches) has not occurred within 10 days after a pre-emergence application, activate with 0.15 inches of irrigation. When used as a post-emergent, susceptible weeds absorb Tenacity through foliar contact and soil absorption. Foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll) and death may take up to three weeks. A repeat application is required after two to three weeks for improved post-emergence weed control. A non-ionic surfactant should be added in post-emergence applications.




What makes Tenacity different than other currently used turf herbicides?

Tenacity is a selective, systemic herbicide that features a new mode of action for pre- and post-emergence grass and broadleaf weed control in several cool- and warm-season turf species—like keeping bentgrass out of your rough. Tenacity can also be applied on established or newly seeded turf.

How was Tenacity herbicide discovered?

A Syngenta scientist in California noticed that there were fewer weeds growing under his bottlebrush (Callistemon citrinus) plant, far fewer than can be explained by shading alone. He concluded that the plant must be producing allelochemicals to suppress weed competition. Syngenta synthesized mesotrione based on the allelochemicals produced by the bottlebrush plant.

What is the mode of action of Tenacity herbicide?

Tenacity inhibits a plant enzyme called HPPD that is essential to photosynthesis and prevents formation of carotenoids in susceptible plant species. Without carotenoids, light energy and by-products of photosynthesis will destroy chlorophyll and cell membranes. This results in bleaching of leaves followed by necrosis and death of the plant.

How quickly does Tenacity work?

Once absorbed, Tenacity quickly translocates throughout the plant. Weed growth is suppressed soon after application, as photosynthesis is disrupted. Death of the plant usually occurs within two to three weeks.

What are some of the unique benefits of Tenacity herbicide?

Tenacity has pre- and post-emergence activity on 46 dicot and monocot weed species. It can selectively control perennial monocots such as bentgrass and nimblewill and annuals such as crabgrass and goosegrass in many turfgrass species. Tenacity can be applied at the seeding to prevent weed germination and allow the turfgrass species to establish without weed competition.

Can Tenacity be used to get bentgrass out of roughs and fairways?

Yes. Tenacity selectively controls bentgrass out of Kentucky bluegrass, perennial ryegrass, and tall fescue turf.

What does it mean that Tenacity was granted reduced-risk status by the EPA? Why did Tenacity earn this status?

Reduced-risk is an EPA designated registration status that accelerates the process for registration of certain new plant protection products. Tenacity received reduced-risk status by the EPA based on its unique mode of action, low use rates, and favorable toxicity and human health profiles, as compared to other herbicides currently on the market.

On which grasses has Tenacity been tested for use at or prior to seeding?

Tenacity is safe for use at or prior to seeding on Kentucky bluegrass, tall fescue, perennial ryegrass, and centipedegrass. Application at seeding can be made to fine fescue only if it is less than 20% of a seed mixture.

Are there any grasses on which you can't use Tenacity?

Tenacity is not recommended for use on zoysiagrass, hybrid or common bermudagrass, seashore paspalum, or kikuyugrass.

Can Tenacity be tank mixed with other herbicides?

Tenacity can be tank mixed with Barricade, dicamba, carfentrazone, triclorpyr, atrazine, simazine, s-metolachlor, bentazon, and several three-way phenoxy herbicides. Combinations can help turf managers broaden the weed control spectrum or improve the level of weed control over single-product applications.

How rainfast is Tenacity?

Tenacity is rainfast within several hours under normal rainfall conditions.

What other brands currently on the market offer a product similar to Tenacity?

There are currently no other herbicides like Tenacity for golf courses and sod farms registered for use or sale in the U.S. Tenacity will compete with multiple products from different classes of chemistry.

Rating Snapshot

5 stars   89
4 stars   17
3 stars   10
2 stars   1
1 star   1

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Average Customer Rating
4.5 out of 5 stars (118)

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Most Helpful Customer Reviews
  • 114 of 121 people found this review helpful:

    5 of 5 stars  Tenacity Herbicide
    By Frank in Johnston, IA on 05/07/2012
    Verified Purchase

    I had a lot of weed grasses in my yard and they were invasive and spreading over the whole yard. Tenacity targets weed grasses and kills them while leaving the rest of the yard in tact and that is exactly what it did. All of my weeds are dying. One thing you must note is that this herbicide needs to be watered after it dries on the plant so that the plant takes it in. It will not work if you just spray it on and don't get rain or water it for a couple of weeks. It's pricy but I know of no other chemical that will kill weed grasses and leave what you want, alone.

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  • 74 of 77 people found this review helpful:

    5 of 5 stars  A Miracle Herbicide!
    By Margaret in Scarsdale, NY on 08/14/2012
    Verified Purchase

    I had a lawn that was completely taken over by bentgrass. I used round up on the lawn and put in an entire new lawn. All was well for a year or two. Then the the bentgrass came back in a few isolated areas. I would have to round them up at the end of the season and reseed. This went on for a number of years. When I learned about Tenacity I was thrilled and gave it a try. It works wonderfully! Yes it is pricy, however it beats having to round up the bentgrass, clear it out, put down more top soil and reseed. Try it...you won't be disappointed.

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  • 52 of 59 people found this review helpful:

    5 of 5 stars  Great product! Does exactly what it advertises!
    By Debi in Toledo, Ohio on 09/07/2012

    My mom completely re-sodded front and back lawns and within 3 years it had been invaded by bentgrass. My new lawn was hydro-seeded 5 years ago in a new subdivision that used to be a golf course. Our methodology was to use Roundup in the fall (when the bent grass really seems to take off in growth) and then reseed the large killed off areas, hoping that the Roundup did a thorough job in killing the bentgrass. This becomes very tedious every year, not to mention the expense. We waited a few years for Tenacity to be available to the public and have both been having great results with the product. The good thing is that the remaining blades of good turf remain green in the kill zone. That gives me hope that I may not have to reseed, just wait for the good turf grass to fill in by itself. Our lawns are a combination kentucky blue and fescue blends. My only complaint is that the product is so concentrated and thick. The high concentration makes it even more critical to measure accurately! Not too crazy about the enclosed syringe measuring device. I feel it is too difficult to use and the potential to spill is high. I would love if there could be a more diluted Tenacity product to purchase for the average homeowner. That would make the product easier to measure, plus ensure a bit of wiggle room on the measurements?

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  • 45 of 49 people found this review helpful:

    5 of 5 stars  No more Crabgrass!!
    By Rob in Greeley, Colorado on 08/23/2012
    Verified Purchase

    This product really works. It does take time, so be patient. I still have to apply the second application to finish off the Crabgrass!!! It won't take much, the plants are almost dead now after 2 weeks.

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  • 43 of 45 people found this review helpful:

    4 of 5 stars  Appears to be working!!!!!!!!!!!!
    By Del in Decatur, IL on 06/17/2012
    Verified Purchase

    I was skeptical about whether Tenacity could kill the Nimblewill in my lawn and still leave my Blue Grass and Fescue alone. It's been 2 weeks since the first application and it appears to have definitely wounded the Nimblewill. The second application was applied yesterday, so we'll see if it kills it or not. It's a "pricey" chemical, but is easy to use and hopefully effective. If it works it sure beats Roundup and reseeding.

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Most Recent Customer Reviews
  • 5 of 5 stars  Great product
    By Charles in Nashville, GA on 11/07/2017

    Nutgrass and crabgrass was taking over my yard. As I searched for the right product, I came across Tenacity. It worked excellent. I have centipede and Bermuda grass and it worked fine on both. Even though it specifies not to use on Bermuda, I am planning on redoing my backyard as it is not smooth and I was not very concerned with killing the Bermuda grass. Maybe I was lucky.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  dollar weed
    By Keith in Conway SC on 11/03/2017

    So far product seems to be performing as described. Dollar weed is turning a yellow color. Follow up application being performed this week.

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  • 5 of 5 stars  Tenacity Herbicide
    By Tom in Canton, Ohio on 10/25/2017

    Used Tenacity on my Creeping Bentgrass problem. Put down two applications and the Bentgrass appears to have died, turning brown while leaving the good grass alone. Since its nearing the end of the season I will wait until next spring to see if the Bentgrass returns and the good grass fills in the dead, brown areas, reseeding if necessary. If it does return then will definitely apply again to finish the job. This product worked like a charm and I would definitely buy it again.

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  • 5 of 5 stars  Tenacity
    By Robert in Dayton Ohio on 09/22/2017

    This product exceeded my expectations as both a pre and post emergent it works really well

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Works great !!!!
    By Joe in Burlington, North Carolina on 09/04/2017

    The best stuff for the money !! Works exactly like is says. Ordering was easy and shipping on time

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  • 1 of 1 people found this review helpful:

    2 of 5 stars  Poor long term results for me
    By Rick in Chico,CA on 08/27/2017

    I've had to change my review from last year due to the fact that all of the Bent grass I thought I killed has recovered. I did 3 sprays last summer/fall. It severely damaged the Bent grass but also bleached the desirable grasses. I'm not sure how others claim that good grasses were not harmed. I had to paint my customers lawns because it was so unsightly. Then I had to reseed. A lot of work only to find that the Bent has come back nearly 100%. It did work better on some other weeds.

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  • 5 of 5 stars  Kills crabgrass as promised
    By Billy in Augusta, Georgia 30904 on 08/27/2017

    Applied tenacity as directed with the addition of Astrazine and Surfactant on centipede grass. In about a week you could tell something was happening, and in few more days the crabgrass turned white, the death sentence has been delivered. I plan on applying a 2nd application in 2 to 3 weeks after the initial application. Tenacity is the only herbicide you can safely apply on centipede grass and kill crabgrass.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Nimbleweed killer
    By Neal in Versailles, Ky on 08/26/2017

    I bought this to kill nimbleweed and it appears to have done it's job. It's not cheap, but a little goes a long way, 1/2 teaspoon to a gallon of water. I also bought the surfactant and Mark It Blue to mix with it. Currently a satisfied customer. Shipping was quick.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  2nd REVIEW OF TENACITY
    By Ab in Bloomington, IN on 08/25/2017

    I think the fact that I came back and bought more speaks volumes of what I think of Tenacity. Works on nimblewill, but also works great on just about all weeds. USE AS DIRECTED. A little goes a LONG WAY! Thanks for being helpful Tenacity! 10*. Note: Do use in tandem with Non-Ionic Surfactant for Herbicides.

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  • 3 of 5 stars  tenacity
    By Fred in hamilton mt on 08/22/2017

    had mixed results last fall. waiting for rain to go at it again. fighting creeping bent grass.

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Most Helpful Q&A's

10/11/2011 Mary from Marshfield, Wi

QDo I need to keep the dogs away from the area where I have applied Tenacity?

AYou should keep the dogs off of the area while you are applying Tenacity and until the area has had a chance to dry, about 2-4 hours.

89 of 95 people found this answer helpful.
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04/21/2015 Wayne

QHow soon can I mow my lawn after an application of Tenacity?

A

You can mow your lawn 2 days before application of Tenacity Herbicide and 2-3 days after application. 

69 of 75 people found this answer helpful.
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05/04/2015 Jim from Fort Morgan, Co

QIn one answer about watering you state it does not need to be watered in because it is mixed with water;
however, in another answer you state it does, indeed need to be watered in asap. could you please clarify which is correct. Thank you.

ATenacity is a systemic preemergence and postemergence herbicide for the selective contact and residual control of weeds in turfgrasses. When applied as a preemergent, weeds absorb Tenacity during emergence from the soil. Dry conditions following application may reduce the preemergence activity. If rainfall (0.15 inches) has not occurred within 10 days after a preemergence application, activate with 0.15 inches of irrigation. When used as a postemergent, susceptible weeds absorb Tenacity through foliar contact and soil absorption. Therefore, you should water in Tenacity when using it as a preemergent herbicide but it does not need to be watered in when using it as a postemergent herbicide.

67 of 70 people found this answer helpful.
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07/20/2015 Lori from Keokuk, Ia

QAfter spraying Tenacity Herbicide, when the weeds turn white, do you pull them or just reseed?
I was told I had nimblewill in my yard. It was a large portion with green blades and brown plus some other weeds. I purchased tenacity from you and applied it. The areas that were brown and green haven't turned white but the are scattered portions of other weeds that have. Does that mean anything? Also, am I supposed to pull them after they turn white and reseed?

A

After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll), and death may take up to three weeks. A repeat application is required after two to three weeks for improved postemergence weed control. We would not recommend pulling up any weeds because the product will not get into the root system, and the weeds may come back at that point.

61 of 63 people found this answer helpful.
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03/10/2014 Thomas from Cut Off, La.

QWhat is the shelf life of Tenacity?

AThe shelf life on most liquid herbicides all depends on how they are stored. If the product has been tightly sealed and kept out of sunlight and extreme temperatures, the shelf life is 3-5 years.

55 of 57 people found this answer helpful.
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Most Recent Customer Questions

12/01/2017 Brien from Cape Coral, Fl

QCan I use Tenacity to control crabgrass in Floratam?

A

Tenacity Herbicide is not labeled safe for use on Floratam species and is only for use on St Augustine grown for sod.  Atrazine or Blindside would be the alternative products to use.

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11/29/2017 John from Medina

QWill Tenacity applied at the time of seeding in the Spring prevent wheat straw seeds from coming up?

A

Tenacity Herbicide is not labeled to control any type of wheat pre- or post-emergently. If you would like to provide more details about the type of grass you are planting and how much area you are treating, then we may be able to make a better product recommendation for you.

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11/26/2017 Ernie from Broadwater, Ne

QIs Tenacity Herbicide bad for trees and shrubs?
We have lots of trees and shrubs around and in our Buffalo grass lawn but also have lots of windmill grass that need to be wiped out Knowing that even a little air movement can drift the herbicide into unwanted areas such as my apple trees and shrubs around the patio

A

Tenacity Herbicide should not be used around or on desirable ornamentals and/or trees. This should not be used within 3 feet of the trees or ornamentals.

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10/19/2017 Mike from Danvers, Ma

QWhat is the rate for Tenacity for spot treating?

A

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.

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10/17/2017 Johnnie from Dunn, Nc

QWill Tenasity kill ornamental shrubs?

A

Avoid applications of Tenacity? over the top of exposed roots of trees and ornamentals. Please refer to the product label for full detailed usage instructions.

 

 

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10/10/2017 Eddie from Nm

QCan I apply Tenacity to some of my Bermuda yards now that they are about to go dormant to help further kills some spurge and clover, oxalis and further help with next spring weeds and grasses?
Can I apply again in spring?

A

The product label states that Bermuda grass is sensitive to Tenacity. It can be used on dormant bermudagrass for goosegrass. If the product is used on semi-dormant grass, it may harm the turf by turning it white. 

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10/06/2017 Tom from Rochester, Ny

QDoes Tenacity Herbicide work on annual bluegrass as a post-emergent?

A

Tenacity Herbicide will damage poa annua turfgrass. Be sure to check your grass type to ensure that the product can be used on your lawn safely. 

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10/05/2017 Joyce from Akron, Oh

QHow long after seeding can Tenacity be applied?

A

There is no wait time after applying Tenacity Herbicide to re-seed unless you are re-seeding with fine fescue. For fine fescue, it is recommended that you wait at least 30 days after application to re-seed. 

 

 

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10/02/2017 Glenn

QHow soon can I fertilize the yard after applying Tenacity?

A

There should be no issues applying Tenacity around the same time as a fertilizer as long the label on the fertilizer does not state that it cannot be used with herbicides.

 

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09/28/2017 Denny

QCan you mix Tenacity with Drive XLR8 ?

A

As long as both products do not contain the same active ingredient, and both have labels that allow tank mixing in general. Per the Drive label: The most restrictive labeling applies with any tank mix. To increase spectrum of control of broadleaf and other weeds, Drive XLR8 may be tank mixed with 2,4-D, Triclopyr, and other broadleaf herbicides. Make sure to do a tank mix test first for any clumping or discoloring before applying to the lawn. Also, be sure both products can be used on the treatment area safely.

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