Tenacity Herbicide should be applied when temperatures are between 65 to 85 degrees to prevent inujry or burning of turfgrass. During summer/hot months when daytime temperatures reach above 85 degrees, applications should be done in early morning or late afternoon/evening when temps are coolest for the day to help prevent any injury to the lawn.
Tenacity Herbicide is not labeled for torpedograss and for crabgrass, it is only going to be effective on newly emerged crabgrass up to the 4th tiller stage. It is not going to eliminate mature crabgrass. A non ionic surfactant is needed for best results when spraying as a post emergent.
You may place an order for a replacement syringe for the Tenacity Herbicide by contacting our customer service line at 866-581-7378. We will be more than happy to further assist you.
We would not recommend tank mixing Tenacity Herbicide with other herbicides like Empero when applying as a post emergent application. Tenacity is only labeled for spot treating when applying to actively growing weeds where others allow for broadcasting an area. Tenacity is only broadcasted when applied as a pre-emergent application.
Tenacity Herbicide will generally be rainfast 4 hours after it has been applied. The product needs to have time to completely dry. Once dry, it is considered rainfast, however, for best results, do not apply Tenacity Herbicide when rainfall is forecasted to occur within 48 hours. A surfactant such as Non-Ionic Surfactant for Herbicides would be a great option to use with Tenacity.
Ideally when preparing to seed you would want to clear the ground of as much thatch and debris as possible so that the seed you are applying can make direct contact to soil. If the seed is unable to reach the soil it usually will not germinate, so the cleaner the area the better for your desired results.
View our Cool Season Lawn Care Calendar Schedule for more information.
Tenacity Herbicide is best applied before temps reach above 80 degrees but above 55 degrees. 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 using them together in the same tank. We would recommend doing each on separate days. This way there is minimal stress on your lawn.
Tenacity Herbicide is best applied right at the time of seeding or close to for best results. It can be applied later if needed for the turfgrasses listed on the label with the following precaution: Avoid spraying on newly germinated turfgrass plants. Wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application. It can be applied at anytime temps are below 85 degrees for post emergent control.
Foliage of treated weeds cease growth after application of Tenacity Herbicide, then turn white (loss of chlorophyll) and death may take up to three weeks
To control nimblewill, start applying Tenacity in the spring (late-April) with a nonionic surfactant. You will need to make two or three applications 2-3 weeks apart. You will use it at the 5 oz per acre rate per the label. The product does have a yearly maximum use rate, and the label states "do not apply more than 16 oz of Tenacity per acre per year or per crop (equivalent to a maximum of 0.50 lb of mesotrione per acre per year).You can also apply Tenacity in late summer and fall, but you should initiate them by August for best results. Good cultural practices on your lawn can help reduce its ability of coming back as well.
Any pets (including chickens) would need to be kept out of the area while spraying Tenacity Herbicide and kept out until the application has completely dried. Once dry, it would be safe to allow pets and chickens to resume normal activity.
Please view the full product label for more information.
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 is not labeled for quackgrass as a pre or post emergent. Unfortunately, we do not currently carry any products that are labeled for quackgrass that are safe for use in cool season grass.
We would recommend spot treating with something like Roundup QuikPRO and then reseeding any bare spots after 2 weeks.
View our Quackgrass Treatment Guide for more information.
Ideally, you would not want to put a fertilizer down when the lawn is getting ready to go dormant. If anything, an application could be made now in early October as your last treatment for the year. Tenacity would not be effective on lespedeza (japanese clover) at all as its not labeled for it. Southern Ag Atrazine is labeled for lespedeza and is safe for use on Centipede lawns if used as directed. Another option is Fertilome Weed Free Zone.
Tenacity Herbicide is not labeled for clump fescue, and it is safe for tall fescue.
