Tenacity Herbicide

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4.5 out of 5 stars Rating: 4.7

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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   99
4 stars   18
3 stars   10
2 stars   1
1 star   1

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Average Customer Rating
4.5 out of 5 stars (129)

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Most Helpful Customer Reviews
  • 134 of 142 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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  • 90 of 93 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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  • 64 of 72 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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  • 52 of 56 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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  • 48 of 50 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
  • 4 of 5 stars  Tenacity Herbicide
    By Kevin in Toronto on 07/27/2018

    strong stuff! A small amount makes a big dent in weeds, but doesn't kill the grass. It takes a few days to see results, but it's definitely worth every penny!

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Great Stuff!!!
    By Dave in Guilford, CT on 07/24/2018

    Bent grass and crabgrass took over my two acres of rye and bluegrass this year. In the past, I had tried to dig out and reseed the bentgrass and spot kill the crabgrass which drifts in from a neighbor’s yard. Heard about Tenacity in May. Two applications three weeks apart and all the bad stuff is gone! Rye and bluegrass filled in quickly. Really could not believe how well this worked. Will do spot application this fall and see how things come up in spring. I worked for a landscaper in high school and have always done my own yard work. I have never seen a more effective product!

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  tenacity, WOW
    By Rene in Vanceboro, NC on 07/06/2018

    A little hesitant at first,specially with the price for a small container. I have used all kinds of weed control on my centipede grass, Speed Zone Southern the latest. They all worked ok until Tenacity. This stuff so far is killing all weeds I have tried it on, and my grass is green with no ill effects. Heed the instructions as it is very powerful. It took it a couple of days before results started slowing appearing, leaves turning white. It instructs you to also add a coloring agent as it being so strong they want no overspray. Very impressed

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  • 5 of 5 stars  Weeds in lawn.
    By Bob in Andalusia, AL on 06/22/2018

    Great product. It killed all the weeds as promised in my lawn. Two others I told about it has also purchased and used tenacity with amazing results. Thanks!

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  • 2 of 2 people found this review helpful:

    5 of 5 stars  Be patient, it works and works well!
    By Daren in Central, NJ on 06/15/2018

    I have been using Tenacity from domyown for a few years to get rid of nimblewill. As a side benefit, tenacity also knocks out most other undesirable weeds and, more importantly, undesirable grasses while not harming the stuff you want to grow! While it seems expensive at first, this is a professional product and is highly concentrated (4oz per acre), so it actually ends up less expensive than the stuff you get at the big box stores. (that isn't effective on anything but broadleaf weeds) It takes about a week before you see visible bleaching of the target weeds, but within a month, they'll be gone. If any remain, I hit 'em with a less aggressive 2oz/acre mix to finish them off. This year, I tried a tank mix of Tenacity and Acclaim, as I have an infestation of japanese stiltgrass and Acclaim knocks that out. So far, so good. It's nice having your lawn look like a fairway at a TPC golf course.

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  • 5 of 5 stars  Tenacity is working, great customer service follow up
    By Brent in Chicago on 06/04/2018

    USPS had issues over Mothers Day and took 5 days longer than their posted delivery date with no follow up to my email inquiry. Do my own explained, followed up and offered to ship a new if not received by the 5th business day. Even apologized when they saw it delivered, when it wasn't their fault. Rare customer service for these times.

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  • 5 of 5 stars  it kills crabgrass. Period.
    By Michael in Spartanburg on 06/01/2018

    This works on mature crabgrass and knocks down Bermuda grass. it is not cheap but goes a long way and gets the job done, also works as a pre emergent. sprayed ground and then planted with rye grass, grass came up great, and no weeds. this is in may in the upstate of SC. will use this again. finally found something that really works. Love the white grass as it works. Planted rye grass (Pinnacle III) on top of the dyeing crabgrass and nicely fills in the bare spot.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Awesome product
    By Morgan in Hubert nc on 05/25/2018

    Very good product starting killing crabgrass quick

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  • 5 of 5 stars  Tenacity
    By John in hagerstown, maryland on 05/20/2018

    It works! worth every penny. Follow the directions...

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Finally success
    By Gb in Plainview TX on 04/20/2018

    After struggling for a year with weeds in my buffalo grass I found something that works and doesn’t harm my grass. It is not an overnight process but the weeds are slowly turning white. I sprayed and waited a week to spray a second time. Then I sat back and waited. Love this stuff.

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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.

112 of 120 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.

108 of 111 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. 

100 of 107 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.

83 of 86 people found this answer helpful.
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10/25/2015 Douglas from Winter Haven, Fl

QWhat is the amount of Tenacity per gallon for application on a St. Augustine lawn per 1,000 sq ft?
The label only discusses per acre application. How do you break that down per gallon in a sprayer or per 1000 sq ft application? I am using a 4 gallon backpack sprayer.

A

According to the Tenacity product label for smaller applications, you will need to mix 0.5 tsp of Tenacity and 1.5 tsp of surfactant to one gallon of water covering 1,000 sq ft.

78 of 84 people found this answer helpful.
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Most Recent Customer Questions

08/15/2018 John from Demotte, In

QWill Tenacity Herbicide stop poa from germinating in the fall but still allow me to do some reseeding?

A

Tenacity Herbicide is labeled to suppress poa annua when used as a pre-emergent. Please provide your desired turf grass for seeding details. Thank you!

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08/13/2018 Matt from Fairfield, Ct

QAre there any temperature restrictions on when you can apply Tenacity Herbicide?

A

Tenacity Herbicide may be applied when soil temperatures are around 55 degrees or higher.  Do not apply when air temperature exceeds 85 degrees. 

1 of 1 people found this answer helpful.
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08/11/2018 Mark from Shelbyville, Ky

QWhat do you recommend to combat the wild violet and nimblewill taking over my yard?
The desired grasses in the yard are bluegrass and fescue. Will I get effective control applying at this time of the growing season? Recognizing they are very different weeds, can the recommended products be mixed into one application? Or, should they be separate applications and, if so, how far apart?

A

Tenacity Herbicide can be used for both nimblewill and wild violet.  To control nimblewill, you should start applying Tenacity Herbicide in the spring (late-April). You may 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. For other weeds such as wild violet apply to young, actively growing weeds.

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08/09/2018 Larry from Cowlesville, Ny

QFor spot spraying crabgrass with Tenacity Herbicide, can a dye be used?

A

 

Tenacity Herbicide would be a great option for you to control crabgrass, and yes 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. 

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08/09/2018 Rexlo from Hackensack, Nj

QCan I mix the Tenacity Herbiicide with Eagle 20EW Specialty Fungicide, Dismiss Turf Herbicide & Talstar P (Talstar One) for turf?

A

It is not recommended to mix certain insecticides, herbicides, or fungicides with Tenacity Herbicide.  You should wait to apply insecticides 7 days after treating with Tenacity Herbicide to avoid potential turf injury. Other ingredients in the fungicides or herbicides would be fine to use at the same time if there are no resttrictions on the product label. 

 

 

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08/07/2018 Wayne from Mattoon, Il

QWill Tenacity Herbicide kill poa annua or annual blue grass?

A

Tenacity Herbicide is not labeled to control Poa Annua/Annual Bluegrass as a post-emergent application. The label only states that it could cause injury to it if sprayed. It is only labeled to be used to suppress poa annua when used as a pre-emergent. Please provide your desired turf grass for an alternate recommendation. Thank you!

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08/06/2018 Nike from Michigan

QWill Tenacity Herbicide affect any other cool season grasses?
I sprayed to kill bentgrass and it has worked but I believe it turned some of my other grass, like fescue white as well.

A

Tenacity Herbicide may cause temporary whitening of turfgrass foliage. In general, symptoms appear five to seven days after application and last for several weeks. A repeat application to the same site causes less whitening of the plant tissue.

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08/05/2018 Erin

QHow much of the Tenacity Herbicide do I use on 5,000 sq ft lawn?
How much Tenacity product would I put into 2 gallons of water (2 gal battery sprayer) to cover 1,000 sq ft? I have 5k sq ft of lawn to fully spray when I overseed in fall

A

According to the Tenacity product label for smaller applications, you will need to mix 1 tsp of Tenacity and 3 tsp of surfactant to 2 gallon of water, using 1 gallon each to cover 1,000 sq ft.

1 of 1 people found this answer helpful.
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08/03/2018 Mark from San Jose, Ca

QPlease clarify the mixing directions if one uses 2 gallons.
You stated "... mix 0.5 tsp of Tenacity and 1.5 tsp of surfactant to one gallon of water covering 1,000 sq ft.", QUESTION: to be certain the 1,000 sq. ft. are covered, may one use two gallons of water and still mix in the 0.5 and 1.5 amounts? That is to say, what's important - - the concentration or the total mg. of Tenacity applied?

A

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.

0 of 2 people found this answer helpful.
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07/23/2018 Brett from Canton, Ga

QWhat is the mix rate for Tenacity Herbicide on Fescue lawns?

A

According to the Tenacity product label for smaller applications, you will need to mix 1 tsp of Tenacity and 3 tsp of surfactant to 2 gallon of water, using 1 gallon each to cover 1,000 sq ft.

1 of 1 people found this answer helpful.
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