As you probably know, Centipedegrass is a very sensitive species of turf so many products that eliminate the crabgrass and other weeds can also cause damage to your lawn.
Tenacity is a great pre-and post-emergent herbicide that will control crabgrass along with many other types of weeds and listed safe for centipede lawns. When used for post emergent control of actively growing weeds, a non ionic surfactant is recommended for best results. The surfactant is not needed for pre emergent applications. Turf Mark Blue can be tank mixed to allow you to see where you have treated and to ensure thorough coverage and avoid overlapping.
Review the Tenacity product label and apply as directed to avoid possible injury to your turfgrass. Keep in mind, this is a strong herbicide so any overmixing, overapplying or applying when centipede is transition in or out of dormancy can injure the lawn. Some whitening of the weeds and turfgrass is normal as this is part of the weed killing process, but the color will return in 3-4 weeks at most or after the next 1-2 mowings.
Tenacity Herbicide is not labeled safe to use on bentgrass and per the product label can cause injury.
Please refer to the product label if more information is needed.
Tenacity Herbicide is not labeled to control torpedograss.
Drive XLR8 is labeled for torpedograss in Bermuda grass, Kentucky bluegrass, Buffalo grass, Fescue, Ryegrass, and Zoysiagrass. A Methylated Seed Oil Surfactant is recommended to be used for best results.
Per subnote 3 on page 9 of the Drive XLR8 product label, “Make 2 sequential applications of 1 fl oz per 1000 sq ft and an additional sequential applicaiton up to 0.9 fl oz per 1000 sq ft at 14-21 day intervals.”
Yes, you can apply Tenacity Herbicide to dormant centipede grass. Make sure to read and review the Tenacity product label very carefully and mix exactly what is recommended as this is a strong product and mis-using it can cause temporary turf injury.
When applying Tenacity it is highly recommended to use a temporary turf colorant like Turf Mark Blue to allow you to see where you are spraying. Overlapping your application of Tenacity can cause temporary whitening of the lawn as well, but the color will return in 3-4 weeks at most.
Tenacity Herbicide is labeled to control foxtail both as a pre emergent before weeds germinate and as a post emergent when foxtail is actively growing. For post emergent applications, a non ionic surfactant is needed to be used in the tank mix.
View the full product label for more information.
Tenacity Herbicide is not labeled to control Poa Annua/Annual Bluegrass, it only states that it could cause injury to it if sprayed with tenacity. Since it is not specifically designed to control Poa Annua, a better product choice would be Echelon 4SC. Echelon 4SC is labeled for pre-emergent control of poa annua only.
According to the product label, apply Echelon 4SC Herbicide in August or September to established, non overseeded turf before Poa Annua germinates.
Consult your local Cooperative Extension Service for more specific applications timings for your local area since August and September are approximate timings.
For perennial ryegrass, Tenacity Herbicide is applied at 5 oz per acre in 30 gallons of water. To treat 33 acres, you would need 21 x 8 oz bottles of Tenacity with 990 gallons of water.
Please view the full product label for more information.
If applying Tenacity Herbicide for pre emergent control in late fall or early spring, the timing of the application is important in order to prevent weeds from germinating. For best results, Tenacity should be applied at the same time as overseeding for weed prevention. Results can also depend on the specific weeds you are targeting and if Tenacity is listed to control them as a pre emergent or as a post emergent.
For specific timing recommendations, we like to recommend checking with your County Extension Office for their recommendations as this can vary from region to region.
For a full list of Weeds Controlled by Pre/Post Emergent applications, refer to page 9 on the product label. Remember, for post emergent control of weeds with Tenacity – a non ionic surfactant is needed.
We would advise to apply the Moss killer and wait about 7 days to apply Tenacity Herbicide along with the non ionic surfactant for post emergent control of weeds.
Tenacity Herbicide is not labeled for Virginia Buttonweed.
Fertilome Weed Free Zone is labeled for cool and warm season grasses and labeled to treat Virginia Buttonweed. Keep in mind, typically if this weed is well established and mature - you will need 2 applications for complete control.
View the Fertilome Weed Free Zone product label for more information.
Tenacity Herbicide is not labeled for yarrow. This weed can be difficult to get rid of especially if the rhizomes are not fully removed which you would need to dig down about 12 inches.
Consider using Q4 Plus which is labeled for yarrow. Please refer to the product label to ensure your desired turfgrass species is tolerable.
Tenacity Herbicide should not be tank mixed with Q4. Q4 does not require the addition of a surfactant for post emergent applications while Tenacity does. You also only spot treat with Tenacity for post emergent control but can broadcast with the Q4.
Tenacity Herbicide is only labeled to be used on Bermuda when it is dormant, otherwise it can be sensitive to applications and could harm it. Since Tenacity Herbicide can be used only on fully dormant Bermudagrass, there is not a time when you would be overseeding and using Tenacity at the same time. You would overseed with Bermuda when the turf is actively growing in spring or summer, if needed at all. So if you applied Tenacity on dormant Bermuda, then it would be long gone by the time the turf is completely green and any seeding would be done. If you would like to tell us more about the weeds you are targeting, then we can recommend alternate products for your needs.
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.
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 pulling up any weeds because the product will not get into the root system, and the weeds may come back at that point. It is usually best to remove any excess dead plant matter before you over seed the lawn. Tenacity will not interfere with seed germination of turf grasses listed as tolerant on the product label.
According to the manufacturer's product label for Tenacity Herbicide, "Do not plant any crop other than turfgrass species for 18 months after the last application of Tenacity or injury may occur".
