Tenacity Herbicide - Questions & Answers

You should wait until the newly germinated turf has been mowed two times, or four weeks after emergence (whichever is longer) before making a postemergence application with Tenacity if it was not applied at the time of seeding.

 

Tenacity Herbicide is labeled to eradicate some broadleaf weeds. Please refer to the product label for a list of all weeds controlled. 

Before applying Tenacity you must wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application.  

The product label for Tenacity does state that roses and daylillies are sensitive to it and to avoid over-spray or drift.  

We would not suggest mixing Tenacity and a glyphosate product as there would not be much benefit in doing so. You could mix a pre-emergent like Dimension 2EW or Prodiamine 65 which would cover many broadleaf and grassy weeds. 

When Tenacity Herbicide is used for post-emergent control of weeds the weeds are sprayed directly. According to the product label, when used postemergence, susceptible weeds absorb Tenacity through foliar contact and soil absorption. 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.

Tenacity Herbicide should not be used if the seed you are putting down is more than 20% fine fescue. If you have a fescue blend that is less than 20% fine fescue, then it should be safe to use Tenacity before or at the same time as seeding. Please refer to the product label for full application instructions.

When you apply Tenacity Herbicide will depend on how you are using it. When using Tenacity as a post-emergent herbicide, you should spot treat target weeds when they are young and actively growing, which may be in spring, summer, or fall. Generally, you do not want to use any post-emergent herbicides when temperatures are over about 85 - 90 degrees since your desirable grass will be more sensitive and the target weeds will not be growing when it’s that hot. Tenacity should be used as a broadcast application pre-emergent when renovating lawns listed as tolerant on the product label. Since these are primarily cool-season lawns, this application is generally done in the fall.

Yes, you can apply Tenacity Herbicide before or at the same time as seeding if you are using turf types listed as tolerant on the product label. This herbicide will suppress poa annua as a pre-emergent.

When spot treating with Tenacity Herbicide, you can aerate any time after that without any issues. If the plan is to make a broadcast application, we recommend to aerate before the treatment is applied.

Tenacity Herbicide is not specificaly labeled for jewgrass. Some say that Sethoxydim active ingredient will treat jewgrass. Please contact your local cooperative extension office and speak with the Master Gardener for advice on what is working in your area.

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

There are certain products that are susceptible to problems with high pH balances in water. If a product label does not specifically address this issue it is because this particular product does not usually have any issues with pH.  The product label for Tenacity does not list anything regarding pH levels.

Once mixed with water you should use the product within 24 hours.

Tenacity Herbicide is not labeled for trees so spraying around the trees could possibly harm them. We would recommend contacting the manufacturer directly for instructions on spraying around new trees. Here is the number: 866-796-4368.

Tenacity Herbicide if applied on a windy day could harm/ discolor the bark. We would recommend to spot treat using Roundup Quik pro.

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. Please be sure to find out what type of turf you have and review the product label to make sure your turf is tolerant to this product.

Tenacity Herbicide is labeled to be applied and safe for Perennial Ryegrass.

While Tenacity is labeled to be used on Buffalograss it is not labeled to control wheatgrass.  We are not able to find anything that is labeled to do so.  The best thing to do for this issue is to spot treat with a glyphosate based product like GlyPhoSel Pro and reseed/sod the treated area.

We are not sure if Tenacity Herbicide can be applied with your handheld weed wiper. If you can apply the labeled amount over 1000 square feet with water, we do not see an issue. It would be best to also consult with the manufacturer of your Weed Wiper. 

Tenacity Herbicide will harm Bermuda lawns. Please contact us at 866-581-7378 M-F 9-5PM EST for an alternative product selection that will best fit your needs. Thank you!