Tenacity Herbicide - Questions & Answers

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  • Asked by Maria from Portland, Or
    02/11/2015
    Q
    The bentgrass is gone. How often do I need to spray Tenacity to keep the bentgrass out?
    I don't want the bentgrass to come back. Please let me know at what interval I should spray Tenacity.
    A

    We apologize but there is not an exact time frame of how often you should apply the Tenacity Herbicide to keep the bentgrass out of your lawn. The product label states that the Tenacity acts as a pre and post emergent on bentgrass so it should help prevent it for at least a few months if you sprayed recently as a spring application. Post emergent wise, you would apply it as you start to see new signs of bentgrass growth to eliminate it as its come up at that point. Tenacity is a strong product so you dont want to over apply the product and risk harming/burning your lawn or whiten it too much. You could easily apply it every 3 or 4 monts and should be fine however per the product label regarding treating for bentgrass it states:

    Control of bentgrass (Agrostis spp.) and nimblewill (Muhlenbergia schreberi) – Apply Tenacity at 5 fl. oz. per acre in at least 30 gallons of water per acre at two to three week interval for up to three applications. Apply with a NIS surfactant. Bentgrass control may be more effective in the late summer/early fall just prior to onset of renewed bentgrass growth, than spring/early summer applications.

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    107 of 123 people found this answer helpful.
  • Asked by David from Statesville, Nc
    09/14/2016
    Q
    Do you need to add a surfactant for Tenacity Herbicide pre-emergent application?
    A

    No, when using Tenacity Herbicide as a pre-emergent a surfactant is not needed. Only when you are using it as a post-emergent.

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    101 of 112 people found this answer helpful.
  • Asked by Marty from Meriden, Ct
    09/25/2015
    Q
    How long after apply Tenacity Herbicide can the grass be cut?
    Answer to Wayne is 2-3 days. Answer to Nancy is 5-7 days. Big difference! Also after applying tenacity when can the lawn go back to its watering cycle. Both of my questions, cutting and watering either pre or post, strive to allow the best conditions to get the best per application. I must have missed reading these things in your attached literature. Thank you. Lastly when can I continue with fertilizing the lawn after an application?
    A

    When using Tenacity Herbicide or other post-emergent herbicides, you should not mow at least 2 days before or 2 days after applying the product. You should avoid spraying on newly germinated turgrass plants, and wait until newly germinated turf has been mowed 2 times or 4 weeks after emergence (whichever is longer) before applying, per the product label. Regarding watering, Tenacity is rainfast within a few hours of application, so I would avoid watering within about 3 hours of post-emergent applications. For pre-emergent applications, you will need to irrigate the area with 0.15 inches of water if there has not been this amount of rainfall within 10 days of application. There are no restrictions on fertilizing schedules. Keep in mind that desirable turf may discolor slightly to white or yellow, but listed tolerable turf should recover well. If you are using a fertilizer that can stress the lawn, then it may be a good idea to separate applications by 1-2 weeks. Please let us know if we may further assist you.

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    94 of 98 people found this answer helpful.
  • Asked by Nancy from Oriskany,ny
    09/01/2014
    Q
    How soon can I mow the lawn after applying Tenacity?
    A

    According to the Tenacity product label for New Lawn Establishment: 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 it is an established lawn, we recommend waiting to mow your lawn 2-3 days after application and 2 days prior to application. 

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    89 of 113 people found this answer helpful.
  • Asked by Lea from Melbourne, Victoria, Australia
    01/15/2012
    Q
    Could 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.

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    79 of 88 people found this answer helpful.
  • Asked by Mike from Michigan
    09/15/2015
    Q
    Can I apply fertilizer during the treatment period without harming effectiveness of Tenacity?
    A

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

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    69 of 69 people found this answer helpful.
  • Asked by Danny from Bluffton,sc
    08/04/2015
    Q
    Will Tenacity Herbicide kill crabgrass coming up in my Centipedegrass lawn without harming the grass?
    A

    Tenacity Herbicide would be a great option for you to control crabgrass without harming your Centipede lawn.  Tenacity needs to be tank mixed with a non ionic surfactant or the best results and stick to the leaf surface of the weeds, and its 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. 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. 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. 

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    68 of 74 people found this answer helpful.
  • Asked by Laurie from Southold, Ny
    04/19/2013
    Q
    Does Tenacity kill Zoysia grass?
    I'm looking for a product that will kill Zoysia grass.
    A
    According to the product label: Bentgrass, Poa annua, kikuyugrass, zoysiagrass, seashore paspalum and bermudagrass are sensitive to Tenacity applications. Avoid spraying these turf types unless control and/or injury can be tolerated. Maintain a five foot buffer between treated areas and bentgrass or Poa annua greens. While Tenacity is not labeled to kill zoysia it will most likely do so.
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    67 of 75 people found this answer helpful.
  • Asked by Gregg from Hastings Ne
    07/08/2013
    Q
    What is the application frequency for Tenacity?
    How often should Tenacity be applied? I have made one application and am seeing some results after 5 days. Do I need to reapply and if so, how soon?
    A
    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. Please let us know if you have any other questions.
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    58 of 63 people found this answer helpful.
  • Asked by Bob from Rockville
    07/17/2015
    Q
    Is 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.

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    55 of 59 people found this answer helpful.
  • Asked by Thomas from Glen Allen
    07/01/2016
    Q
    How many times can you apply Tenacity Herbicide to the same lawn in a season?
    Is there a limit? I am seeing results from the first 2 applications (2.5 weeks apart), but it is not fully killing the yellow nutsedge I was looking for it to do. Thanks.
    A

    You can apply Tenacity Herbicide multiple times per year as long as you do not exceed the maximum annual rate of 16 oz per Acre per year. To treat yellow nutsedge, you may need to reapply Tenacity after 2 to 3 weeks; be sure to use a non-ionic surfactant for post-emergent applications. We would allow at least 2 week for nutsedge to yellow after herbicide applications.

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    55 of 62 people found this answer helpful.
  • Asked by Bob from Warrenton, Va
    09/16/2016
    Q
    How long after applying Tenacity before I can apply fertilizer?
    A

    We recommend waiting 2-4 weeks between applications of herbicides and fertilizers to avoid over stressing the treated areas.

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    48 of 55 people found this answer helpful.
  • Asked by Steve from Conway, South Carolina
    09/02/2015
    Q
    Can I apply "tenacity" and the "non-ionic surfactant" while the morning dew is still on the grass?
    I waited until the morning dew had dried off of my lawn before applying the product "tenacity" and the "non-ionic surfactant"...However, I overlooked a small detail. The temperature had exceeded 80 degrees.....I assume closer to 84 -87 degrees......was my application in vain?
    A

    Morning dew will not lessen the effects of Tenacity. It some circumstances a more moist soil will make for better root uptake. You are safe to make the Tenacity application in the cooler times of the day when temps are below 85 degrees. If temps rise above 85 degrees after the product has dried it should not reduce effectiveness. 

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    45 of 47 people found this answer helpful.
  • Asked by Brenda from Millville De
    10/10/2019
    Q
    I overseeded 3 days ago. Is it too late to spray Tenacity Herbicide?
    Tall Fescue
    A

    Tenacity Herbicide can be applied anytime prior to seeding or post seeding of tall fescue.  

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    43 of 46 people found this answer helpful.
  • Asked by Doug from Oxford
    10/06/2016
    Q
    Can 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. 

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    43 of 45 people found this answer helpful.
  • Asked by W. from Western Massachusetts
    05/16/2015
    Q
    Should grass clippings be bagged after tenacity application, or left on lawn with mulching mower for 1st cut?
    A
    It would be best if clipping were bagged after first mow and applicaion of 
    Tenacity Herbicide.  Bagging will also help with lawn health.
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    42 of 44 people found this answer helpful.
  • Asked by Frank from Plattsmouth, Ne
    06/09/2015
    Q
    What 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.
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    39 of 45 people found this answer helpful.
  • Asked by Tim from Michigan
    06/24/2015
    Q
    How 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.
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    38 of 44 people found this answer helpful.
  • Asked by Peter from Oklahoma City, Oklahoma
    05/24/2013
    Q
    Which pre- emergent is best for control of nutsedge
    Every year i have problem with nutsedge weed. Can you suggest which pre- emergent is best to use.
    A
    Nut sedge is a summer weed that is hard to control using a pre emergent. A great post emergent to ponder over is called Sedgehammer. SedgeHammer herbicide kills nutsedge without injury to turfgrass, established ornamentals, shrubs, and/or trees. SedgeHammer provides post-emergence control of both purple nutsedge and yellow nutsedge. SedgeHammer also controls many broadleaf weeds and suppresses kyllinga. Nutsedge is controlled after emergence in cool and warm season turf grasses such as St. Augustinegrass, Bermudagrass, Kentucky Bluegrass, tall and fine fescue, and perennial ryegrass. Sedgehammer is considered one of the more "gentle to turfgrass" products and pets and people can return to the treated area once the spray dries.
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    38 of 41 people found this answer helpful.
  • Asked by Dean from Omaha, Ne
    08/11/2015
    Q
    How long after application of Tenacity Herbicide should I wait to reseed?
    I will be using Tenacity to control Nimblewill, and my lawn is perennial rye and fine fescue.
    A

    Generally, if you are treating with Tenacity Herbicide and using a tolerant seed, the applications can be done at the same time. If not, we would recommend waiting three months after the application of Tenacity Herbicide to re-seed your lawn. If you have any specific questions, we would recommend giving us a call at 866-581-7378.

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    38 of 43 people found this answer helpful.
Displaying 21 to 40 (of 467 questions)