No, when using Tenacity Herbicide as a pre-emergent a surfactant is not needed. Only when you are using it as a post-emergent.
According to the Tenacity product label for New Lawn Establishment: Wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application. If it is an established lawn, we recommend waiting to mow your lawn 2-3 days after application and 2 days prior to application.
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. To treat yellow nutsedge, you may need to reapply Tenacity after 2 to 3 weeks; be sure to use a non-ionic surfactant for post-emergent applications. We would allow at least 2 week for nutsedge to yellow after herbicide applications.
Tenacity Herbicide may be applied when soil temperatures are around 55 degrees or higher. Do not apply when air temperature exceeds 85 degrees. Your target temperature range will depend on whether you are using Tenacity for pre-emergent or post-emergent applications. This is typically between 65-85 degrees. Please consult the product label for complete application instructions.
We apologize but there is not an exact time frame of how often you should apply the Tenacity Herbicide to keep the bentgrass out of your lawn. The product label states that the Tenacity acts as a pre and post emergent on bentgrass so it should help prevent it for at least a few months if you sprayed recently as a spring application. Post emergent wise, you would apply it as you start to see new signs of bentgrass growth to eliminate it as its come up at that point. Tenacity is a strong product so you dont want to over apply the product and risk harming/burning your lawn or whiten it too much. You could easily apply it every 3 or 4 monts and should be fine however per the product label regarding treating for bentgrass it states:
Control of bentgrass (Agrostis spp.) and nimblewill (Muhlenbergia schreberi) – Apply Tenacity at 5 fl. oz. per acre in at least 30 gallons of water per acre at two to three week interval for up to three applications. Apply with a NIS surfactant. Bentgrass control may be more effective in the late summer/early fall just prior to onset of renewed bentgrass growth, than spring/early summer applications.
We recommend waiting 2-4 weeks between applications of herbicides and fertilizers to avoid over stressing the treated areas.
There should be no issues applying Tenacity around the same time as a feritlizer as long the label on the fertilizer does not state that it cannot be used with herbicides.
Tenacity Herbicide would be a great option for you to control crabgrass without harming your Centipede lawn. Tenacity needs to be tank mixed with a non ionic surfactant or the best results and stick to the leaf surface of the weeds, and its advised to use a dye like Turf Mark Blue with it so you can make sure to not overlap if you plan to do a broadcast application on the property. According to the Tenacity product label you will need to mix 1/2 tsp of product + 1 1/2 tsp surfactant with 1 gallon of water for spot treatments. 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.
Yes, Tenacity can be applied in the summer. Keep in mind that the best temperature range to apply most herbicides, including Tenacity, is between 65-85 degrees.
Tenacity Herbicide is labeled for use on Tall Fescue, Kentucky Bluegrass, Centipedegrass, Buffalograss, Perennial Ryegrass, Fine Fescue, St. Augustine Grass. Other species of grass such as Bentgrass, Poa annua, kikuyugrass, zoysiagrass, seashore paspalum and bermudagrass are sensitive to Tenacity applications and damage may occur. According to the product label - Residential Lawn Applications: 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 turfgrasses may occur.
We do not ship to Australia and we are not sure if the manufacturer offers Tenacity in Australia. You can contact the manufacturer, Syngenta, to inquire about availability 866-796-4368.
When using Tenacity, 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 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.
Morning dew will not lessen the effects of Tenacity. It some circumstances a more moist soil will make for better root uptake. You are safe to make the Tenacity application in the cooler times of the day when temps are below 85 degrees. If temps rise above 85 degrees after the product has dried it should not reduce effectiveness.
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.
Yes, Tenacity Herbicide can be used in the evening time. The application should be made in the early morning or late evening so that it does not burn plants. See the product label for complete application instructions.
Tenacity Herbicide is only labeled for use on St. Augustine grass that is grown on sod farms. It cannot be used on St. Augustine in residential lawns. Blindside WDG Herbicide is labeled to treat crabgrass in residential St. Augustine lawns.
If you are using Tenacity Herbicide as a pre-emergent herbicide, then you should aerate first and then apply Tenacity at the same time as seeding or just before. Do not wait until the new grass has started to come up before using Tenacity. If using Tenacity as a post-emergent, then you can apply anytime before seeding, but keep in mind that it may take a couple weeks to kill the target plants, so you would want to wait for those plants to die before aerating and reseeding.
