Tenacity Herbicide

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Tenacity Herbicide bottle(s) (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 postemergence applications.


Active Ingredient: Mesotrione - 40%
Target pests: Barnyardgrass, Carpetweed, Chickweed, Clover, Crabgrass (large & smooth), Dandelion, Foxtail, Goosegrass, Henbit, Nutsedge, Purslane, Thistle, Wild Carrot and others
* See label for complete list
For use in: Kentucky Bluegrass, Centipedegrass, Buffalograss, Tall Fescue, Perennial Ryegrass, Fine Fescue, St. Augustine Grass
Application: 4 - 8 oz. per 30 gallons of water per acre
* See label for complete application instructions
Formulation: Professional Product
Group 27 Herbicide
Manufactured By: Syngenta



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   29
4 stars   8
3 stars   6
2 stars   0
1 star   1

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Average Customer Rating
4.5 star rating (44 reviews)

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Most Helpful Customer Reviews
  • 45 of 48 people found this review helpful:

    5 of 5 Stars  Tenacity Herbicide
    By Frank in Johnston, IA on May 7, 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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  • 35 of 35 people found this review helpful:

    5 of 5 Stars  A Miracle Herbicide!
    By Margaret in Scarsdale, NY on August 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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  • 24 of 27 people found this review helpful:

    5 of 5 Stars  Great product! Does exactly what it advertises!
    By Debi in Toledo, Ohio on September 7, 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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  • 24 of 26 people found this review helpful:

    4 of 5 Stars  Appears to be working!!!!!!!!!!!!
    By Del in Decatur, IL on June 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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  • 20 of 20 people found this review helpful:

    5 of 5 Stars  No more Crabgrass!!
    By Rob in Greeley, Colorado on August 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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Most Recent Customer Reviews
  • 1 of 1 people found this review helpful:

    5 of 5 Stars  ForsheeMS
    By Shane in Lexington, N on April 25, 2015
    Verified Purchase

    Tenacity is excellent stuff! While most standard herbicides at the big box stores will take care of the easier to kill weeds Tenacity will get rid of the tougher ones. It really did a number on poa annua and crabgrass in my lawn with no permanent damage to the turf. I did get a little bleaching in my tall fescue but the color came back and all is well. Don't expect overnight results. Tenacity takes nearly 2 weeks to show visible results. Haven't used it as a pre-emergent yet but plan to this fall during my overseed.

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  • 5 of 5 Stars  Good cool season product
    By Jeff in Madison, WI on April 22, 2015
    Verified Purchase

    This product has done a great job of knocking down some very tough weeds in my Kentucky Bluegrass turf. Waiting to see how the residual controls as a pre-emergent as the weather warms up.

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  • 1 of 1 people found this review helpful:

    3 of 5 Stars  My first experience with Tenacity.
    By Roger in Chattanooga, Tennessee on April 18, 2015
    Verified Purchase

    I had plenty of rain in the week after Tenacity application. Within 5 to 7 days the weeds, including crabgrass, buffalo grass, clover and other broad leaf plants began to turn yellow and then white, and die. Where the application was heavier the color change was more dramatic. I seeded with fresh good quality seed, a blend of the new varieties of K-31 and other cool season home turf grasses. As of 16 days I have very little new grass appearing in my yard. It has been a wet spring in Chattanooga,therefore water is not the problem. I am beginning to wonder if the claim that you can apply Tenacity and seed all in the same day of two is really true. I hope so; the seed costs me almost $1,000. If the grass seed does pop up I will be sure to add that to this note. As a herbicide, it seems to be doing well. I am going to wait to apply the second application of Tenacity until I see what the grass seed really does do.

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  • 6 of 6 people found this review helpful:

    3 of 5 Stars  Never ending battle of Bentgrass
    By Kathy in Buffalo NY on October 23, 2014
    Verified Purchase

    I heard so many great things about Tenacity that I needed to try it to remove my lawn of bentgrass. This is my 3rd application and I still have bentgrass. It does work but expect at least 6 weeks of an unsightly lawn with each application. You will also have to keep reapplying it so your lawn will look unsightly again. Also it is costly but you only need 1/2 teas per gallon of wate.r Could be because of the amount od bentgrass that I have but I wish it would work quicker and more effectively. One plus, is that it does not damage the good turf.

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  • 3 of 3 people found this review helpful:

    5 of 5 Stars  Worked as Expected
    By Mike in Shelton, Washington on October 20, 2014
    Verified Purchase

    This is a product I have been looking for to control my poa annua and creeping bentgrass. After I treated it took awhile, but sure enough my weeds stared turning a whitish color. It took a couple weeks to start seeing results so you have to be patient. I have just applied a second treatment and can't wait for next spring to see final results.

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  • 6 of 7 people found this review helpful:

    4 of 5 Stars  Tenacity Kicks Nimblewill Butt
    By Greg in VA on October 8, 2014
    Verified Purchase

    Even the small container of the selective herbicide goes a long way for spot weed control as you use a miniscule amount of product, via the included syringe, for a pump sprayer. One needs patience as it takes an application, then another a couple of weeks later, for the nimblewill / nimbleweed to turn color. it will also turn neighboring grasses white as well, yet they will grow out according to the instructions. I am about to start re-seeding the thick areas of weed that will now pull out easily as it is dead.

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  • 1 of 1 people found this review helpful:

    4 of 5 Stars  Tenacity Review
    By Marty in Hempstead, N.Y. on October 7, 2014
    Verified Purchase

    Within the first two weeks, I noticed that some grass was turning white, which, according to the instructions, was supposed to happen. The net grass is still brown, and I am hoping after the second treatment, which was done a couple of days ago, will do the trick. I bought the product specifically for bent grass, and I hope that it works.

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  • 5 of 5 people found this review helpful:

    3 of 5 Stars  Nimble weed control
    By Bem in OH on October 5, 2014
    Verified Purchase

    Put it down at half strength to control nimble weed. It appears to be killing nimble weed but the tall fescue doesn't look so good as well. Everything turning white, Hopefully grass will come back

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  • 2 of 2 people found this review helpful:

    4 of 5 Stars  Tenacity Herbicide
    By Chevo in Burke, VA. on September 29, 2014
    Verified Purchase

    I purchased and used the Tenacity Herbicide for my 1 acre lawn and followed the directions provided by mixing 1 tsp per gallon of water and adding surfactant. First, the price at DoMyOwnPestControl was the cheapest. My local nursery in Northern Virginia tried selling me the same product for twice the price. Second, I chose this product as recommended by my local nursery because the Ortho Crabgrass Killer spray bottle, which attaches to my water hose had not worked 1 month prior. Third, after using the product, I noticed that the crabgrass and other weeds started to eventually turn white; then died. Within 2 weeks of using the product, I mowed my lawn, dethatched, core-aerated, oversed, and topdressed. Therefore, it is too early for me to determine how long it's effects will last. Overall, I will rate this at 4 out of 5 stars. It is a great product, does the job, is certainly cheaper at this website. The remaining star is what remains to be seen in the future...

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  • 3 of 3 people found this review helpful:

    4 of 5 Stars  Works great to remove bentgrass
    By JP in Central Indiana on September 24, 2014
    Verified Purchase

    I had a large section (about 4,000 sq. ft.) of Kentucky bluegrass/fescue/perennial rye lawn which had long been seriously infested with creeping bentgrass, as well as some bermudagrass or nimblewill (I can't tell the difference between them) and wild violet. I used 2 applications (at the label recommended rate) of Tenacity, 10 days apart, starting the first week of September. I applied as a spot spray with a backpack sprayer. A week after the second application, I did indeed have large patches of white lawn. 10 days after the second application, The bentgrass appears to be completely dead, and the lawn grasses appear to be slowly recoloring. The Tenacity had little to no affect on the wild violets or the bermuda/nimblewill. It did nail a few plaintains, dandelions and some crabgrass. Since it's late in the season, I'll go back to hitting the wild violets and bermuda/nimblewill with Acclaim/Triclopyr, which does work well in a single application. Although the Tenacity is quite expensive, I've never seen anything else work like this on bentgrass. DMOPC.com's price for Tenacity was less than half the price from my local retail supplier. Along with that, a little of this product goes a very long way.

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Most Helpful Q&A's

August 9, 2011 William from Springfield, Il. asked:

QHow much Tenacity do you mix in a one gallon sprayer?

AAccording 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 for spot treatments

77 of 80 people found this answer helpful.
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June 14, 2013 Gregg from Hastings Ne asked:

QApplication tips for Tenacity
I wish to apply Tenacity with a hand sprayer. Do you have any application tips? Would broadcast application be better than spot spraying? If spot spraying, how much should I apply?

A

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

Broadcast treatments would be recommended if you are needing to actually treat the entire lawn for pre-emergence, if you are only needing to treat small areas or use as a post emergent then you can spot treat.

26 of 26 people found this answer helpful.
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October 11, 2011 Mary from Marshfield, Wi asked:

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.

24 of 27 people found this answer helpful.
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March 8, 2012 Scott from Grosse Ile Michigan asked:

QAfter applying Tenacity and surfactant how long do you have to wait to seed or sod?

AAccording to the Tenacity product label "Apply Tenacity at 5-8 fl. oz. per acre in at least 30 gallons of water per acre prior to seeding or post seeding of tolerant turfgrass species listed on this label, except fine fescue. Tenacity may reduce density of fine fescue seedings. Tenacity can be used on grass seed blends that contain less than 20% by weight of hard or fine fescue. Tenacity will control many monocot and dicot weeds that compete with and slow the establishment of the turfgrass stands. Apply at grass seeding or close to seeding for best performance. Avoid spraying on newly germinated turfgrass plants. Wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application." If you need more specific information on a turfgrass not mentioned on the product label you can reach the manufacturer at 866-796-4368.

17 of 23 people found this answer helpful.
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March 10, 2014 Thomas from Cut Off, La. asked:

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.

13 of 13 people found this answer helpful.
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Most Recent Customer Questions

July 20, 2015 Lori from Keokuk, Ia asked:

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.

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July 17, 2015 Bob from Rockville asked:

QIs evening application of Tenacity Herbicide okay?
Will application of Tenacity in the evening be as effective as applying in the early or mid-morning?

A

Yes, Tenacity Herbicide can be used in the evening time. The application should be made in the early morning or late evening so that it does not burn plants. See the product label for complete application instructions.

1 of 1 people found this answer helpful.
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July 15, 2015 Mike from Conewago Township, Pa asked:

QIs Tenacity Herbicide Effective on broadleaf woody invasive and poison ivy?
I'm having difficulty with oriental bittersweet and poison ivy. Is this herbicide effective?

A

Tenacity Herbicide  would not be the best product for Poison Ivy. BK 32 would be a better option for Bittersweet and Poison IVy. BK32 can be applied to most Residential Turf: Bluegrass, Fesue, Rye, Bent, Bermuda, Bahia and Zoysia Lawns 
Avoid application to St. Augustine or Centipede lawns unless injury can be tolerated.

1 of 1 people found this answer helpful.
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July 15, 2015 Mike from Manchester, Pa asked:

QIs Tenacity Herbicide Safe on Spruce Trees?
Can I spray this product as both an herbicide and pre emergent in and around blue spruce ornamental trees (weeds emerging through bottom branches)? If yes, what is a safe application rate?

A

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.

1 of 1 people found this answer helpful.
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July 12, 2015 Mike from Wilton, Ct asked:

QHow long does Tenacity take to kill plants?
I used the recommended spot treatment amounts of Tenacity with surfactant. Even applied 2nd treatment to most of it. Most leaves turned white as expected but not all and the weeds did not die. Now all it of appears to have recovered as most of it is a normal green. What do I do now? Try again? I am worried about applying too much but the nimblewill will not die but turned white.

A

The foliage of weeds treated with Tenacity cease growth after the application, then turn white (loss of chlorophyll), so death may take up to three weeks. A repeat application is required after two to three weeks for improved postemergence weed control.

2 of 3 people found this answer helpful.
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June 24, 2015 Tim from Michigan asked:

QHow do I apply Tenacity Herbicide for Kentucky Bluegrass?
"Unless renovating and/or re-seeding the home lawn, avoid broadcast applications of Tenacity for pre and post-emergence weed control because undesirable whitening of some turfgrasses may occur." What turfgrasses are susceptible to whitening? I have a Kentucky bluegrass, Perennial Ryegrass mix.

A Tenacity Herbicide can cause lightening of turf grasses labeled as not tolerant. The application rate you should use to ensure the Kentucky Bluegrass and Ryegrass will not lighten is no more than 5oz per acre.

3 of 3 people found this answer helpful.
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June 14, 2015 Steve from Allison Park Pa asked:

QDoes Tenacity Herbicide need to be watered in after applying?

A

After treating with Tenacity, you want the product to have at least 6 hours of dry time before any rain or irrigation occurs. You do not want/need to water after a post emergent application. We recommend using the spot treatment rate of Tenacity in the dense areas so as to not cause damage to your lawn. Tenacity is known due to its power to even with an accurate application to sometimes temporarily whiten the turf surrounding the weed areas. The color will normally return within 3-4 weeks so to minimize the chance of turf discoloration you will want to use the lower dose at first and be cautious to not overlap or too heavily apply the product. Please let us kow if you have any other questions.

4 of 4 people found this answer helpful.
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June 9, 2015 Frank from Plattsmouth, Ne asked:

QWhat is the maximum application temperature for Tenacity.
Heat spell, but I need to get a second spraying on the weeds in the buffalo grass before it rains for the next week or two. Want to know if I can spray it at exterior temps over 90 degrees.

A Tenacity Herbicide  can be applied up to 80 degrees.

4 of 5 people found this answer helpful.
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June 9, 2015 Frank from Plattsmouth, Ne asked:

QWhat is the maximum application temperature for Tenacity?
Heat spell, but I need to get a second spraying on the weeds in the buffalo grass before it rains for the next week or two. Want to know if I can spray it at exterior temps over 90 degrees.

A Tenacity Herbicide should not be applied to the lawn when temperatures are over 90 degrees or on day when you are expecting rainfall.

6 of 6 people found this answer helpful.
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June 2, 2015 Ty from Spokane, Wa asked:

QHow long after application is Tenacity rainfast?
Applied 4oz/acre to 30 day old seedlings and got 1.5" of rain a few hours later. Rainfall was quick enough to cause flooding, 1.5" in about 2 hours. Will the Tenacity application be effective?

A  Tenacity Herbicide will be rainfast 4 hours after it has been applied or after it has dried. 

5 of 5 people found this answer helpful.
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