Tenacity Herbicide

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Tenacity Herbicide bottle(s)(8 oz.)

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Tenacity Herbicide

Tenacity is a systemic preemergence and postemergence herbicide for the selective contact and residual control of weeds in turfgrasses. When applied preemergence, 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 postemergence, 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 postemergence weed control. A non-ionic surfactant should be added in postemergence applications.


Active Ingredient: Mesotrione 40%
For use in: Kentucky Bluegrass, Centipedegrass, Buffalograss, Tall Fescue, Perennial Ryegrass, Fine Fescue, St. Augustine Grass
Coverage Area: 5 to 8 fluid ounces per acre
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.

What is the active ingredient in Tenacity herbicide?

Mesotrione is the active ingredient in Tenacity herbicide.

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 turf species can Tenacity be applied to?

Tenacity can be applied to many of the cool-season turf types commonly found on fairways and roughs, such as Kentucky bluegrass, perennial ryegrass, tall fescue, fine fescue, centipedegrass, and St. Augustinegrass (sod only). Lower use rates are recommended for perennial ryegrass, fine fescue, and St. Augustinegrass. Tenacity is not for use on putting greens and tees.

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   17
4 stars   2
3 stars   3
2 stars   0
1 star   0

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Average Customer Rating
4.6 star rating (22 reviews)

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Most Helpful Customer Reviews
  • 25 of 27 people found this review helpful:

    5 of 5 Stars  Tenacity Herbicide
    By Frank on May 7, 2012

    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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  • 16 of 17 people found this review helpful:

    4 of 5 Stars  Appears to be working!!!!!!!!!!!!
    By Del on June 17, 2012

    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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  • 14 of 14 people found this review helpful:

    5 of 5 Stars  A Miracle Herbicide!
    By Margaret on August 14, 2012

    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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  • 13 of 13 people found this review helpful:

    5 of 5 Stars  No more Crabgrass!!
    By Rob on August 23, 2012

    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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  • 11 of 13 people found this review helpful:

    5 of 5 Stars  Great product! Does exactly what it advertises!
    By Debi 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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Most Recent Customer Reviews
  • 4 of 5 Stars  Tenacity on fesue
    By Brad on April 12, 2014
    Verified Purchase

    Large patches of poatravalis in my fescue has been driving me nuts. Applied tenacity at full rate with a surfactant and 7 days later poatravalis is almost completely white and growth rate and seeding has almost stopped. Second half rate application to follow. So far only slight damage to fescue has occurred. Applications were done while temps were in the 70's and avg soil moisture.

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  • 5 of 5 Stars  Solid Herbicide
    By Greg on September 29, 2013

    A unique set of features sets this herbicide apart from others. Tenacity is both pre-emergent and post emergent, it works on both grass and broadleaf weeds, and it won't affect grass seed germination. Excellent product when used on a newly seeded turf to prevent weed competition.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Indiana
    By Ray on September 26, 2013
    Verified Purchase

    Wow- it has been a lifetime looking for this solution, where have you been, the quantity is perfect for my 5000 sf

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  • 0 of 1 people found this review helpful:

    5 of 5 Stars  Tenacity Works
    By Paul on September 18, 2013
    Verified Purchase

    I decided to buy this as my Niblewill problem had gotten so out of control I would have had to replant half my lawn. Mixed according to directions and I'm watching the darn pest turn white. Also working on my clover, crab grass, and other broad leaf weeds. Used a 2 gallon tank sprayer to apply. So far so good.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Finally, a way to kill Creeping Bentgrass
    September 5, 2013
    Verified Purchase

    A year ago I killed my front yard (90'x80') with round up, tilled in compost and added about 8 yards of topsoil because it was infested with light green areas of poor quality grass which I know realize was creeping bentgrass. Starting late July this year I noticed areas of the lighter green grass popping up again so after some internet research I found out about Tenacity. This product is amazing! I mixed it up a week ago and applied with a 1 gallon tank sprayer (I recommend mixing 4 to 5 gallons at a time because Tenacity is thick and hard to measure small amounts) and sprayed entire front lawn, a couple of days ago I noticed the new growth on the bentgrass is white and yesterday even more of the bentgrass is losing it's color and turning white, the best part is the good lawn grass is still looking great, my lawn is a 33/33/33 mix of blue, ryegrass and fine fescue mix for NE. Don't be put off by price, this stuff works and goes a long way!

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  • 5 of 5 Stars  Tenacity Herbicide effective
    September 3, 2013
    Verified Purchase

    Used the Tenacity with the lawn tractor and pull behind 15 gallon sprayer to treat our approx. 1/4 acre front yard. It destroyed the nimbleweed in two weeks, leaves turned white so the lawn looks a little funny right now. We did a second application as instructed and will be sowing new grass in the near future.

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  • 3 of 3 people found this review helpful:

    5 of 5 Stars  Amazing results
    July 25, 2013
    Verified Purchase

    I have been searching for a product to control both broadleaf and weedy grasses in my centipede yard in eastern NC. The initial price of the product was difficult to overcome, but I am glad that I tried the product. Spot treatment for post emergent control requires only 2.5 cc /gal of Tenacity and I added a surfactant. Within 3 days I could see white tips on the treated areas without any damage to the centipede. At 10 days the areas are browning, again without any damage to the centipede. Treated areas included; Florida betony, mimosa weed, bahia, crabgrass and a number of others. Looking forward to using this product on the Florida betony during the fall and spring blush.

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  • 4 of 4 people found this review helpful:

    5 of 5 Stars  no more crepping bentgrass
    July 12, 2013
    Verified Purchase

    Finally a working solution to crepping bentgrass. I was fighting bentgrass for the last 4 years and it always came back even after killing everything with roundup and redoing the whole lawn. This really works and after 1 week you can see first results. Make sure you use a surfactant.

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  • 3 of 3 people found this review helpful:

    5 of 5 Stars  Tenacity Works
    June 19, 2013

    Had quack grass starting to take hold in my yard. Used Tenacity and after 5 days I can already see the product working. Quackgrass is turning white and the surrounding lawn looks good.

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  • 3 of 4 people found this review helpful:

    3 of 5 Stars  Tenacity for crabgrass in blue/rye grass central IN
    June 16, 2013
    Verified Purchase

    I usually use pre-emergent crabgrass (CG) control, but I needed to fill in bare spots from last years drought. I used Tenacity at 1 tsp per gallon with 3 tsp of non-ionic surfactant, i.e., 5 oz per acre as a spot treatment... difficult to do since CG is so ubiquitous. It seems to kill young CG well after 3 days dry & sunshine but washes off with rain after about 36 hr requiring re-treatment. It will kill other wide blade grasses (mature ones) that you may not recognize as CG and it's a little rough on newly emerged ryegrass in my hands at this rate. I just keep hoping to knock the CG back as the season continues.

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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

45 of 48 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.

16 of 16 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.

11 of 13 people found this answer helpful.
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January 15, 2012 Lea from Melbourne, Victoria, Australia asked:

QCould you please confirm that Tenacity will not kill of Tall Fescue or any other grasses?
Is Tenacity available in Australia, Melbourne

A

Tenacity Herbicide is labeled for use on Tall Fescue, Kentucky Bluegrass, Centipedegrass, Buffalograss, Perennial Ryegrass, Fine Fescue, St. Augustine Grass. Other species of grass such as Bentgrass, Poa annua, kikuyugrass, zoysiagrass, seashore paspalum and bermudagrass are sensitive to Tenacity applications and damage may occur. According to the product label - Residential Lawn Applications: 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.

We do not ship to Australia and we are not sure if the manufacturer offers Tenacity in Australia. You can contact the manufacturer, Syngenta, to inquire about availability 866-796-4368.

8 of 8 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.

8 of 8 people found this answer helpful.
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Most Recent Customer Questions

March 10, 2014 Thomas from Cut Off, La. asked:

QWill Tenacity work on Dallisgrass?

A Per the product label, dallisgrass is sensitive to Tenacity. You should avoid spraying these turf areas. Please let us know if you are trying to get rid of dallisgrass or you are wanting to treat other weeds in dallisgrass. We would be happy to select a product that will fit your specific needs. For free expert advice, please call us at toll-free 866.581.7378 M-F 9-5PM EST.

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March 10, 2014 Thomas from Cut Off, La. asked:

QWhat is the shelf life of Tenacity?

A The 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.

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October 30, 2013 Sylvia from Belleville, Illinois asked:

QBest times to apply Tenacity for zone 6b
I want to use Tenacity for Nimblewill as a broadband post emergent now and later as a pre emergent to control re-infestation. Right now it is brown/tan in color in my lawn. Is it too late in the growing season to use it now?

A

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. Consult your local Cooperative Extension Service for more specific applications timings for your local area. Their contact information can be found by clicking the link below.

http://www.ahs.org/gardening-resources/master-gardeners

http://www.csrees.usda.gov/index.html

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October 10, 2013 Rick from Louisville, Ky asked:

QI'm confused whether or not it will hurt new Kentucky Bluegrass seed?
I've read the label but it say's it hurts Fescue's when seeding but it also says it suppresses Bluegrass, Annual Poa annua. I need this cleared up as I'm about to seed. I've already put 1 app of Tenacity down.

A

Kentucky Bluegrass (Poa pratensis) is different than regular Bluegrass (poa annua). It is true that 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. It will not harm your Kentucky Bluegrass seeding. If you need more specific information on a turfgrass not mentioned on the product label you can reach the manufacturer at 866-796-4368.

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September 14, 2013 Linda from Mcmurray Pa asked:

QDoes Tenacity control creeping charlie?

A Yes, Tenacity is labled to control Ground Ivy "Creeping Charlie" as post emergent control. We highly recommend using a temporary turf colorant like Turf Mark Blue so that you can see where you spray with the Tenacity to avoid overlapping. Tenacity is a great product, but also a very strong product so too much overlapping or mixing the product too strong can cause temporary damage and whitening to your turf around the ground ivy. The color will come back in the lawn after 3-4 weeks but to avoid this potential problem it is best to use a colorant to make sure no overlap occurs. To get optimum results for post emergent control it is recommended you use a Non Ionic Surfactant in your mixture as well.

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August 28, 2013 Steve from Macedonia Oh asked:

QIs the application rate for a blanket spraying over entire yard the same as spot spraying with Tenacity?

A

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 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.

0 of 2 people found this answer helpful.
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August 21, 2013 Andrew from Stoneham asked:

QIs Tenacity safe for blueberry bushes, perennials and trees?

A Blueberry bushes, perennials and trees are not listed on the Tenacity product label. For additional information, please contact the manufacturer at 866.796.4368.

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August 14, 2013 Per asked:

QNimblewill and Crabgrass Post Emergent Treatment - Rain
I want to do Post-Emergent Treatment of Nimblewill and Crabgrass cool season turf with mix of KYB, Fesue and Rye. What is the amount of time the Tenacity should dry before rain or irrigation? Should it be irrigated for Post-Emergent treatment? The overall area to be treated is 4300 sq ft. The weeds are dense in a 1600 sq ft area and then sparse (spot treat) through the rest of the turf . Is the dense weed area considered spot treatment, so that 1/2 tsp per gallon or is it consider large area treatment using the higher rate of 1 tsp per gallon ?

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.

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August 11, 2013 Gloria from Winnetka, Il asked:

QI keep bees in my back yard. Can I use Tenacity on the bentgrass without harming my bees?

A Tenacity Herbicide could potentially harm bees if they come in contact with the treated area. We recommend contacting your local cooperative extension office and speak with the master gardener in your area for advice on product that will not harm bees.

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August 5, 2013 Dale from Leesburg,va asked:

QIs Tenacity Herbicide bad for pets?

A Tenacity herbicide is safe to use in a yard will pets will frequent as long as they are out of the area during the application. They can safely return after the area has dried.

2 of 2 people found this answer helpful.
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