Yes, Tenacity Herbicide is safe for use on Kentucky 31 Tall Fescue as directed on the product label.
Tenacity Herbicide is labeled to control ground ivy aka creeping charlie as a post emergent only, it may take a few applications to completely kill it.
Your timing is really going to depend on a lot of factors, such as the weeds you are targeting and if/when you are seeding. We would exercise caution if you are applying multiple herbicides at the same time, especially since Trimec is already a blend of 3 active ingredients. Mixing Trimec and Tenacity would be used only as a spot spray, and we would still do a small jar test before mixing a tank of these as well as testing an inconspicuous area of the lawn for tolerance first. You should only use Tenacity as a broadcast pre-emergent application if you are renovating or overseeding the lawn, and most Trimec products require you to wait 2-4 weeks after application before you can reseed. Please let us know if you have additional questions about your application.
You do not want to scalp your lawn before applying herbicides. You should not mow within 2 days of an application of Tenacity Herbicide or any other herbicides. Keep in mind that you should not make a broadcast application of Tenacity on your lawn unless you are seeding or overseeding; otherwise, you may see whitening on your desirable turfgrass. Please let us know if you have other questions about this product or what may be most suitable for your application.
We would suggest testing the flow rate and pace of walk using the 2-gallon sprayer with plain water to determine the best nozzle setting before treating with Tenacity Herbicide. You want to be sure you are walking at an even pace and evenly spraying the area for best results.
The label for Poa Constrictor does not mention anything about tank mixing with another herbicide such as Tenacity Herbicide. Per the Tenacity label: 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.
We would recommend doing a compatibility test before treating.
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 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 can be used as a spot treatment in your lawn. A broadcast application would be considered spraying over the entire lawn area. Spot treatment is used when you only have certain spots or areas that need to be treated versus the entire lawn. According to the product label unless renovating and/or re-seeding the home lawn, avoid broadcast applications of Tenacity for pre and post-emergence weed control because undesirable whitening of some turf grasses may occur. Please follow the specific directions on the product label for your needs.
It is recommended that you do not mow 2 days before or 2 days after the application of Tenacity Herbicide.
Tenacity Herbicide does cause whitening of plants since its mode of action is to prohibit chlorophyll production in target plants. According to the product label, this product may cause temporary whitening of turfgrass foliage. In general, symptoms appear five to seven days after application and last for several weeks. Grass usually recovers after 3-4 weeks.
Tenacity Herbicide should be applied before soil temperatures reach 55 degrees if using as a pre-emergent. If using as a post-emergent you would apply when the target weeds are actively growing and healthy. You can check with your local cooperative extension office Master Gardener for specific timing in your area.
We would not recommend Tenacity Herbicide be applied to flower beds and ornamental plants. According to the product label: “Avoid over-spray or drift of spray applications onto ornamentals or flower beds and gardens. Roses and daylilies are sensitive plant species. Avoid applications over the top of exposed roots of trees and ornamentals." A product that can safely be applied to Liriope, landscaped areas, over the top of ornamentals is Fusilade II Herbicide.
Tenacity Herbicide is not labeled to control orchardgrass. Unfortunately, we do not know of any selective herbicide that will kill orchardgrass without harming your desirable turfgrass. It is usually recommended to spot treat the orchard grass as much as possible with a non-selective product like RoundUp QuikPro, and then replant in those areas in a couple of weeks when the orchard grass is gone.
Yes, Tenacity can be used to kill wild violet in fescue grass.
The best temperature range to apply most herbicides, including Tenacity, is between 65-85 degrees.
Tenacity Herbicide may be applied when soil temperatures are around 55 degrees or higher for post emergent control. If you are using a pre-emergent you would need to apply before soil temps reach 55 degrees.
Tenacity Herbicide only lists on the label that seashore paspalum is sensitive to it. It is not however labeled for use on St Augustine lawns so would not be recommended. It can only be used on St Augustine grown for sod.
Tenacity Herbicide is labeled for application for post-emergent control of Nimbleweed to established cool season turf. Per the product label, you may need a second application after 2 to 3 weeks. Apply to young, actively growing weeds, and be sure to use a surfactant such as Southern Ag Non-Ionic surfactant for post-emergent applications.
