When using Tenacity Herbicide you should remove the thatch layer before reseeding, and it is best to aerate prior to the application as well. You want to be sure that the new seed has the best chance to come in contact with the soil.
The best temperature range to apply most herbicides, including Tenacity, is between 65-85 degrees.
Tenacity Herbicide will not control moss. For moss in lawns we would recommend using the Lily Miller Moss Out in granules or liquid.
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 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.
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.
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 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'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.
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.
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.
Tenacity Herbicide should be applied and completely dried prior to allowing anyone (including animals) to return to the treated surfaces.
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. For 5 gallons of water you will need to mix 2 1/2 tsp of Tenacity and 7 tsp of surfactant, using 1 gallon each to conver 1,000 sq ft.
Tenacity Herbicide states the following in reference to tank mixing. We always recommend doing a small tank mix test before application.
"Tenacity has been tested in tank mixtures with Barricade 65WG Herbicide (prodiamine), Vanquish® (dicamba), Turflon® ester (riclopyr), Spotlight™ (fluroxypyr), Quicksilver™ (carfentrazone), Basagran® (bentazon), Princep® (simazine), and AAtrex® (atrazine) for safety and efficacy on turfgrasses. Tenacity must be applied at reduced rates (4 fl. oz./A or less) if tank mixed with atrazine, bentazon or simazine. Other tank mixture partners may be safe but have not been tested. Turf managers wanting to tank mix Tenacity with other herbicides should test on a small basis for compatibility, safety and efficacy before treating large areas. See product labels for directions and precautions"
