According to the Tenacity product label for smaller applications, you will need to mix 1 tsp of Tenacity and 3 tsp of surfactant to 2 gallon of water, using 1 gallon each to cover 1,000 sq ft.
Tenacity Herbicide can be applied at the same time as seeding (unless grass is more than 20% stand of fine fescue). If application cannot be done within 7 days of seeding you would need to wait a minimum of 30 days, or until the seed has emerged and been mowed at least twice before applying to the lawn.
Tenacity Herbicide will not control moss. For moss in lawns we would recommend using the Lily Miller Moss Out in granules or liquid.
The best temperature range to apply most herbicides, including Tenacity, is between 65-85 degrees.
Tenacity Herbicide should be applied when temperatures are between 65 and 85 degrees and when there is no rain in the forecast for 24 hours. If your temperatures reach above 85 degrees during the day, apply in the morning or evening when it is cooler.
Yes, Tenacity Herbicide is both a pre and post emergent. So it can be sprayed now to kill the current crabgrass that you have as long as it is still actively growing. Please be sure to use the product label for the correct usage rates for your application.
Tenacity Herbicide's label says to "not apply an organophosphate or carbamate insecticide within seven days of a Tenacity application". Bayer's Dylox 6.2 Granules or Dylox 420 SL both have an active ingredient of Trichlorfon which is considered an organophosphate, therefore you should wait the window of at least 7 days before you apply Dylox 6.2 or Dylox 420 SL to the area that has been treated with Tenacity Herbicide.
Tenacity Herbicide is not labeled for Japanese stiltgrass. We generally recommend using Acclaim Extra Selective Herbicide for Japanese stiltgrass. Be sure to check the label to make sure your turfgrass is tolerant.
If it rained less than 4 hours after applying Tenacity Herbicide, you will need to reapply, but wait until the area has dried. Tenacity Herbicide is labeled for Yellow Nutsedge so it should work if that's what you have, just make sure to follow the label instructions. Sedgehammer Herbicide is definitely a great solution for nutsedge. According to the label you may overseed with annual or perennial ryegrass or bermudagrass, 2 weeks after application. All other seeding can be done 4 weeks after application. If you plan to aerate, you can do it 3-4 weeks after application as well to avoid stressing your grass.
If you plan on aerating it is best to aerate prior to an application of Tenacity. This is especially important for pre-emergent weed control.
Tenacity Herbicide does cause whitening of plants since its mode of action is to prohibit chlorophyll production in target plants. Many users have had whitening on the lawn after applications, but the grass usually does recover after 3-4 weeks. The product label specifies that Tenacity be used at lower rates for St. Augustinegrass, and only on established sod St. Augustine; St. Augustine lawns started from seed may have more sensitivity Tenacity. If the grass is still growing and needing to be mowed, then it will usually recover. You may want to wait several weeks to be sure future applications will not permanently damage your turf. Also, be careful so that your application is even and not overlapping, and that you are using a surfactant when making your application. You may also want to consider adding a turf marker such as Turf Mark Blue to prevent over-application.
If you are spot treating, you will need to use 1 tsp. of Tenacity along with 3 tsp. Non Ionic Surfactant in 2 gallons of water per 1,000 sq. ft.
When using Tenacity Herbicide as a pre-emergent and seeding, you can apply Tenacity before or at the time of seeding for best results as long as you are planting a turfgrass that is listed as tolerant on the product label (Kentucky bluegrass and tall fescue are tolerant). The key time to avoid spraying Tenacity on new seedings, either as a pre-emergent or a post-emergent, would be when the new seedlings have started to come up but are not yet established. Once you see new seedlings, you would want to wait at least four weeks or until the new grass has been mowed twice, whichever is longer. Please refer to page 12 of the label for complete application instructions around seeding.
Tenacity Herbicide should be applied and completely dried prior to allowing anyone (including animals) to return to the treated surfaces.
You do not have to remove dead plant matter after using Tenacity Herbicide, however if you plan to overseed, then it is a good idea to rake out dead plants since you may need to dethatch or aerate before putting down your new seed.
