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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.
|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 (grown for sod only)|
|Application:||4 - 8 oz. per 30 gallons of water per acre
* Use a Surfactant to Increase Effectiveness
* See label for complete application instructions
Group 27 Herbicide
|Shelf Life:||5-8 years from date of manufacture when properly stored. Keep out of direct sunlight and extreme temperatures|
|Shipping Weight:||0.74 lbs|
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.
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103 of 110 people found this review helpful:
By Frank in Johnston, IA on 05/07/2012
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.
70 of 72 people found this review helpful:
A Miracle Herbicide!
By Margaret in Scarsdale, NY on 08/14/2012
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.
47 of 54 people found this review helpful:
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?
44 of 48 people found this review helpful:
No more Crabgrass!!
By Rob in Greeley, Colorado on 08/23/2012
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.
40 of 42 people found this review helpful:
Appears to be working!!!!!!!!!!!!
By Del in Decatur, IL on 06/17/2012
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.
By Sharon in O Fallon on 08/18/2017
First application almost two weeks ago the bentgrass is turning white. (As stated). Going to do a second application this weekend. So far very impressed with this product, seems to be killing only the creeping grass and the other grass is still green. Hope it continues!!
Tenacity is Awesome
By Dave in New Bern, NC on 08/16/2017
I have been fighting crabgrass in my Centipede lawn for years. I found Tenacity and applied it per the instructions (spot spraying). As advertised, the weeds turned white, which made it much easier to identify them for the second application, after which they were gone. This is a terrific product!
Works great BUT....
By Al in Douglas, GA on 08/10/2017
Tanacity works very well however the cost is prohibitive for large properties. I'll buy more when the cost is seriously reduced.
quick service, good product
By Barrett in Maryland on 08/08/2017
This was my first DoMyOwn.com purchase and I'm impressed: - the product (Tenacity) shipped the same day I ordered and I had it two days later - the cost was competitive - they included the syringe (seems not all merchants do) I've used the Tenacity (with a surfactant & a 1-gallon pump sprayer) once so far spot-treating weeds and it's working well. Turns the weeds white and doesn't kill the grass. I plan to hit the whole lawn in both fall and spring. I had been paying over $400/year for professional treatments on my <4000 sqft lawn and they were using Tenacity to control the weeds. While they did more than just the weeds, having access to the Tenacity and knowing it works on my weeds means I can do all the treatments myself at less than a quarter the annual cost.
Tenacity is 10* all the way
By Ab in Bloomington, IN on 08/02/2017
Some of my nimblewill came back, but could be seed and it really beat it back. Works great on broadleaf too. This stuff costs a little bit, but is worth every penny. USE AS DIRECTED! Surprises how little it uses. Do use in tandem with Non-Ionic Surfactant for Herbicides.
1 of 1 people found this review helpful:
Finally - a product that will kill stubborn weeds quickly!!
By Bernie in Door Village, Indiana on 07/11/2017
I've been trying to deal with Nimblewill that's been spreading steadily in almost an acre of lawn. Tried several products in the past several years, even tried a nationally-known commercial lawn care company. No luck. DoMyOwn led me to a good insecticide when I had an ant problem, so I decided to shop the website. That foray led to Tenacity coupled with a surfactant. I sprayed it with a tow-behind tank sprayer five days ago - the literature tells me that results should take up to three weeks, but the sporadic crabgrass has already turned completely white and the pesky nimblewill is well on its way, having gone to a very light yellow. The Tenacity interferes with chlorophyll production and eventually kills the plant. Best of all, Tenacity is extremely selective. My next-door neighbor who just finished building a new home, planted a new lawn two weeks ago, and the new grass has not yet been cut, although the crabgrass in his yard is growing wildly. I sprayed about a foot over the property line, and the results are striking. His tender new grass plants are still healthy and happy and deep green, but the crabgrass there is completely white. Tenacity isn't cheap, but if you're unfortunate enough to be fighting nimblewill or something equally pesky, this is the product to use! And if you're having difficulty identifying which pesky weed you're dealing with, check out the Plant and Pest Diagnostic Lab at Purdue University. You can send them a picture or a sample, and they'll positively identify it.
Bye bye crabgrass
By Pat in Southwest Ohio on 07/03/2017
So just planted Kentucky blue it is up about 1 inch and the crabgrass just took over. So read other posts, thanks for them. Bought the 8 oz offer and mixed 8 oz to 30 gal with surfactant . Two days later the large 10 inch tall crabgrass is turning very light green HA HA HA crabgrass once it finally croaks probably Friday will pull out roots and overseed to patch bald spots. Treated 10000 sqft with pullbehind tank sprayer with 3head boom and hand wand for corner teeatment. This stuff really works
By Lonnie in Burlington, Ky 41005 on 06/26/2017
Great product! Purchased it mainly to combat nimblewill and it honestly did a bang up job for me. It works well on other listed weeds as well. It's a slow acting product but sure does the job, especially with two recommended treatments.
Perfect Once You Hit Something It Targets
By Justin in WEST COLUMBIA, SC on 06/20/2017
This is a very-selective herbicide. It worked great for some Crab-Grass in my Centipde but unfortunately didn't touch green-killinga. I am not holding this against it in the review because it is not labeled to do that. Ironically, it did knock out most of my green nutsedge, which is in the same family as Killinga I hear. the solution to that was a product called Dismiss (also sold here). I just want to point out this product DOES have some soil activity. I rinsed out a sprayer about 6' from a shurb and had a few leaves turn paper-white in color - oops. Had some areas go light green as well. Seems to be recovering nicely and needed to be trimmed anyway. Just be careful. This is one of those super-powerful , yet highly selective herbicides.
0 of 1 people found this review helpful:
Not sure yet
By John in Fairmount, IN on 06/18/2017
After first application turned whole yard brown. Most of the "good" grass is starting to come back now. Its been about three weeks. A little hesitant to put second application down because I don't want to stress yard out again. Looks bad now but may be worth it in the end. Time will tell...
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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.
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.†
You can mow your lawn 2 days before application of†Tenacity Herbicide and 2-3 days after application.†
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.
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.
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.
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.
10/31/2016 Rick from Berea
QHow long should I wait until I can put a winterizer on my lawn after an application of Tenacity Herbicide?
A There is no specific time that you need to wait after using an herbicide like Tenacity before you can apply a fertilizer. As long as the turf is healthy and you are following the directions on the product labels for what you are applying, then you should not come across any problems. Please see our Lawn Care Schedule for additional tips.
There is no specific time that you need to wait after using an herbicide like Tenacity before you can apply a fertilizer. As long as the turf is healthy and you are following the directions on the product labels for what you are applying, then you should not come across any problems. Please see our Lawn Care Schedule for additional tips.
10/30/2016 Rod from La Habra Ca
QIf I only used 1 tsp of Tenacity Herbicide per gallon of water and not in 2 gallons of water, should I repeat application or go ahead and reseed the area?
I purchased a bottle of tenacity from you a few months back. I recently treated areas of tall fescue that have turned ghost white (whitening was expected) a week + later I realized I messed up and mixed only 1 gallon per tsp/1000 sq feet + nis . The label calls for 2 gallons of water per tsp. Please let me know if you have any feedback of whether I should wait it out or prepare to reseed the affected areas? Thanks
A Since Tenacity is an effective herbicide for weed control prior to or during seeding of certain turfgrasses during turf renovation and the water is only acting as the carrier for the solution to get into the weeds, you should be ok to reseed if you are happy with the results. For post emergent applications, you will need to wait for the turf to be established after 2 mowings to reapply. †
Since Tenacity is an effective herbicide for weed control prior to or during seeding of certain turfgrasses during turf renovation and the water is only acting as the carrier for the solution to get into the weeds, you should be ok to reseed if you are happy with the results. For post emergent applications, you will need to wait for the turf to be established after 2 mowings to reapply. †
10/26/2016 James from Indian Trail, Nc
QCan I now do my second round of Tenacity Herbicide on new grass?
I got one round of tenacity on my lawn then i aerated & reseeded 3 weeks ago. I fixed some large bare spots as well. I have new grass growing, but I see more weeds and clover and Crabgrass coming back. Can I now do my second round of Tenacity on this new grass. I'm starting the win the battle looks like, but Crabgrass is still hanging in there on about 30 % of total lawn.
A If you have already seeded, then you do not want to apply Tenacity Herbicide to the newly seeded turf until is has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application.
If you have already seeded, then you do not want to apply Tenacity Herbicide to the newly seeded turf until is has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application.
10/19/2016 Al from Waterford, Michigan
QHow soon can I reseed after applying Tenacity Herbicide to kill bentgrass?
I applied 3 applications in two-week intervals. The lawn was 80% bentgrass. Is it getting too late in fall to seed?
A Per the product label on Tenacity Herbicide, apply at grass seeding or close to seeding for best preformance. If you are not close, meaning within a week of application, then you would need to wait 6-8 weeks to re-seed, As for your questions is it too late ot re-seed, we recommend you contact a master gardener in your area or your Local Extention Office to get more information on that.†
Per the product label on Tenacity Herbicide, apply at grass seeding or close to seeding for best preformance. If you are not close, meaning within a week of application, then you would need to wait 6-8 weeks to re-seed, As for your questions is it too late ot re-seed, we recommend you contact a master gardener in your area or your Local Extention Office to get more information on that.†
10/06/2016 Doug from Oxford
QCan I still apply Tenacity Herbicide to my lawn in Ohio in October?
A Tenacity Herbicide can be applied any time the weeds and grasses you are treating are still actively growing with temperatures†consistently above 55 degrees. Please let us know if we can be of any more assitance.†
Tenacity Herbicide can be applied any time the weeds and grasses you are treating are still actively growing with temperatures†consistently above 55 degrees. Please let us know if we can be of any more assitance.†
09/29/2016 Sylvia from Nashville, Tn
QHow long after Tenacity application can I seed with an annual rye?
I see instruction for perennial rye but not annual. I have decided to switch to Bermuda next year so a temporary rye lawn would be best for me this winter but I've already treated with Tenacity twice. How long until I can seed annual Rye? Or not at all?
A When using Tenacity Herbicide there should be no issue with planting annual rye seed after using it. Per the product label you would want to apply either at seeding or close to it for the best performance.†
When using Tenacity Herbicide there should be no issue with planting annual rye seed after using it. Per the product label you would want to apply either at seeding or close to it for the best performance.†
09/29/2016 Greg from Sarasota, Fl
QWill Tenacity Herbicide control bahiagrass?
A Tenacity Herbicide is not labeled for bahiagrass. However, you could use a product like ProSedge Herbicide. It is labeled for bahiagrass and is safe for use on various types of lawns, including St. Augustine, as long as it is not Floratam.†
Tenacity Herbicide is not labeled for bahiagrass. However, you could use a product like ProSedge Herbicide. It is labeled for bahiagrass and is safe for use on various types of lawns, including St. Augustine, as long as it is not Floratam.†
09/27/2016 Bill from Palm Coast, Fl
QWhat is best herbicide to control weed called nimblewill in mixed lawn of Zoysia & St. Augustine Grass, FL?
We are in mid Florida on East Coast above Daytona Beach and below St Augustine in a city called Palm Coast, Fl.
A Tenacity Herbicide is a great option for post emergent control of nimblewill. It is also safe for use in St. Augustine and Zoysia grass. You will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments.
Tenacity Herbicide is a great option for post emergent control of nimblewill. It is also safe for use in St. Augustine and Zoysia grass. You will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments.
09/27/2016 Joshua from Canton, Oh
QCan aerate after using Tenacity Herbicide?
I'm trying to build a schedule but I have a hard time planning it out. I plan to core aerate my yard now and then after winter and again in the fall and overseed. Does it matter when I aerate after applying this stuff or do I need to wait until all the weed grasses are gone? I assume that the weeds being covered by this will still die even if they end up buried under the cores.
A SInce you can use Tenacity Herbicide either prior to or during seeding of certain turfgrasses you could either aerate before or after using the product and it would still work. There is nothing on the product label stating that there is a certain time to do aerating.†
SInce you can use Tenacity Herbicide either prior to or during seeding of certain turfgrasses you could either aerate before or after using the product and it would still work. There is nothing on the product label stating that there is a certain time to do aerating.†
09/20/2016 Tom from Sidney, Ne
QIs Tenacity effective on Windmill grass?
A Tenacity Herbicide†is labeled to treat for Windmill grass.†
Tenacity Herbicide†is labeled to treat for Windmill grass.†