Potassium was applied at 3.5 lbs. Tenacity selectively controls bentgrass out of Kentucky … Tenacity Herbicide is a systemic pre-emergent and post-emergent weed killer. This product will … See label for a complete … I would do at least 2 applications. Be careful — our products will kill any plant they come in contact with, including grass you want to keep. Since little dead leaf tissue will be removed by mowing following an application of Tenacity, superintendents may need to remove dead leaf tissue by raking prior to sequential Tenacity treatments in order to … Creeping bentgrass is a difficult to remove weed typically found on golf courses and mowed short for tees, fairways and greens. The soil was a silty clay with 4.6 percent organic matter, 2 percent sand, 46 percent silt, and 52 percent clay. It’d be a good idea to apply a second post emergent of Tenacity herbicide to kill bentgrass. per acre in at least 30 gallons of water per acre at two to three week interval for up to three applications. Tenacity can be used on grass seed blends that contain less than 20% by weight of hard or fine fescue. Manufactured by Syngenta, Tenacity Herbicide is a highly effective systemic pre- and post-emergent for the selective contact and residual control of over 46 broadleaf and grassy weed species in turfgrass. This makes killing spots and reseeding very difficult. Tenacity can only be applied by lawn care professionals. Camper, N.D. 1986. I don’t see why the seeds won’t be able to germinate through the low bentgrass areas. Leaf tissue of Tenacity treated creeping bentgrass has turned brown. The only way to control it remains non-selective applications of Roundup (glyphosate). This can be done at the same time of seeding. To test the hypothesis, an experiment was conducted in field plots that had an established stand of BrightStar perennial ryegrass overseeded with Penncross creeping bentgrass at the Agricultural Experiment Station, Fargo, N.D., in 2007 and repeated in 2008. Tenacity may reduce density of fine fescue seedings. Res. Bentgrass may need more than one application of Tenacity to eliminate. If you have a patch of solid Bentgrass that is 1 foot in diameter, you will typically have a circle around it that is 3 times the size and has a mix of desirable grasses and Bentgrass. If you have this problem and want to get rid of the quackgrass, start now in May by killing the infested areas. $64.98 Killing this area with glyphosate doesn't make sense - it defeats the whole purpose of using Tenacity (selectively killing the undesirable bentgrass...) But I think I'm realizing I missed the boat - I should have applied T as post-emergent a few weeks ago in August, and started the killing process then such that I could grow new grass now. grasses (Figure 2). oz. J. The efficacy of a foliar systemic herbicide application depends on many factors, including reaching the plant leaves, retaining herbicide on the leaf surface, penetration into the leaves, movement to the site of action, length of activity in the plants, absorption by roots, persistence in soil, and soil characteristics. Gaussoin. per acre with UAN plus non-ionic surfactant at a two-week interval provided the highest observed creeping bentgrass control of 93 percent in 2007 and 97 percent in 2008 (Table 3). Controlling bentgrass can be a daunting task. Tenacity Mesotrione Herbicide. Help! A view of the experimental area following treatment with Tenacity. Apply with a NIS surfactant. If for some reason you are not seeing the seeds germinate through, then you still have time to trim down the bentgrass more and then seed again. Effect of adjuvant and urea ammonium nitrate on bispyribac efficacy, absorption, and translocation in barnyardgrass (Echinochloa crus-galli). Apply the herbicide 3 times, waiting 3-4 weeks in-between applications. I watched your video about it but you didn’t mention what I could use to get rid of it. Getting rid of creeping bentgrass weeds will most often require the use of herbicides. If you have this problem and want to get rid of the quackgrass, start now in May by killing the infested areas. The results are undesirable visual quality, poor playing conditions and scalping. Depending on the size and severity of bentgrass in your lawn, two applications of Tenacity, approximately 10-14 apart, should eradicate creeping bentgrass. Evaluation of creeping bentgrass survival also was conducted on May 29, 2008 and May 14, 2009. It’s all over my lawn in splotches. Massey, M.C. The grass was mowed weekly at 2.0 inches. The active ingredient mesotrione that makes this herbicide tenacity work so darn well will kill: Bentgrass, Crabgrass; Dandelions; Clover, Nutsedge; Henbit; Foxtail; And over 40 other common household weeds. Tenacity (mesotrione) is used to kill bentgrass, clover, and other non-desirables. Once the bentgrass is controlled, you can reseed the lawn. Christians. It indicates that temperature and sunlight intensity both impact the efficacy of Tenacity. The problem with creeping bentgrass is that it reproduces both by stems that grow at the surface (stolons) and by seed. A careful study of the Tenacity label reveals that besides uniform application, the label addresses factors of soil moisture; leaf surface retention and penetration (addition of a non-ionic surfactant); and persistence in the plants (repeated application requirement). Without carotenoids, excessive light energy destroys chlorophyll and causes new growth to appear white before necrosis and death (Giese et al., 2005). Based on the results of this study, Tenacity should be applied at 1.0 oz. Is it necessary to remove the dead grass (sod) prior to reseeding or sodding? Learn more about bentgrass and useful control methods at http://www.spring-green.com. Re: Is this the correct plan for killing bentgrass with tenacity? “I have question about creeping bent grass. The best time to start this process is in mid-July, and it requires three applications, spaced two weeks apart, to achieve complete control. When used as a pre-emergent: Sequential applications of 1.0 oz. The addition of triclopyr also boosts control, while killing some broadleaf weeds. You can also use the Tenacity to highlight the Bentgrass and then hand pull as it will be easier to see. Research methods in weed science. 3rd ed. Bentgrass actively grows in the heat of summer. All of my weeds are dying. – Apply Tenacity at 5 fl. Thanks. Tenacity is a systemic herbicide with pre- and post-emergence activity on many grass and broadleaf weeds. Tenacity (mesotrione) is the first herbicide that results in rapid, easy to visualize reductions in weedy perennial grasses, including creeping bentgrass. One of its uses is selective control of creeping bentgrass from other cool-season grasses, such as Kentucky bluegrass and perennial ryegrass. Experts’ Insights: Annual bluegrass weevil, Experts’ Insights: Tamping down tropical signalgrass, 2016 U.S. Open host John Zimmers gives Oakmont CC updates from GIS, Stevens Water highlights Pogo turf monitoring system at GIS. After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of … 1. Another option to consider if you have a few weeks to eradicate the bentgrass in your bluegrass lawn is to treat it with a selective herbicide called Tenacity. Recommended management Managing for high quality and competitive cool-season turfgrass year round is … ›, Mow It High: How to Get Rid of Weeds and Have a Healthy Lawn. The best time to use Round-Up is when the grass is actively growing and not under heat or drought stress. The clippings were manually collected and removed using a spring rake. Tenacity (mesotrione) is a systemic herbicide that selectively controls nimblewill in bluegrass lawns. Goosegrass (Eleusine indica) is a very troublesome grassy weed in athletic fields, golf greens, tees and fairways, and in other turfgrasses that are mowed short.It germinates when soil temperatures reach 60 to 65°F, and requires moisture and light for germination. Apply at grass seeding or close to seeding for best performance. Creeping bentgrass (Agrostis palustris) is a cool-season perennial grass that flowers in late spring or early summer. Is aerating helpful or necessary? Yes. 3 Ways to Get Rid of Creeping Bentgrass in Your Lawn, Enter your address to find available services. Therefore, any attempts to improve the efficacy of a foliar systemic herbicide should address one or more of these basic factors (Calhoun et al., 2005). In both years, adding UAN to non-ionic surfactant improved Tenacity efficacy when applied at either low or high rates. By the way, one 8 ounce bottle of Tenacity will cover an acre of property, so you probably will not need more than 8 ounces. BENT ON STOPPING BENTGRASS A great way to control bentgrass is by spot treating it with Roundup ® Ready-To-Use Weed & Grass Killer III with Sure Shot ® Wand. per acre in each of three sequential applications on two-week intervals using a non-ionic surfactant plus UAN with power raking. Tenacity works by stopping the plant’s ability to produce chlorophyll, which causes it to turn white and die. You can also use the Tenacity to highlight the Bentgrass and then hand pull as it will be easier to see. Tenacity ® Herbicide offers pre- and post-emergent control of more than 46 broadleaf weed and grass species, including crabgrass, ground ivy, yellow foxtail, yellow nutsedge and unwanted bentgrass. Product Details Features & Benefits Supporting Materials Related Products Performance FAQ News What weeds will tenacity kill? Dodds, D.M., D.B. What are the application rates of Tenacity? When applied as a pre-emergent, weeds absorb Tenacity during emergence from the soil. The label recommends using a surfactant and up to three applications. Once Tenacity is applied to the lawn, the bentgrass will turn bright white and be very noticeable, so be prepared that this will happen. ft. per year from polymer coated sulfur-coated urea (43N-0P-0K) in two equal applications in May and September of both years. © 2020 North Coast Media LLC, All Rights Reserved. Tenacity targets weed grasses and kills them while leaving the rest of the yard in tact and that is exactly what it did. Selective Creeping Bentgrass Control Tenacity™ is the first turfgrass herbicide that results in rapid, easy to visualize reductions in weedy perennial grasses (Figure 2). Southern Weed Sci. The tenacity you just sprayed on it should still help kill it more. Mesotrione controls creeping bentgrass (Agrostis stolonifera) in Kentucky bluegrass. (FlowZone battery backpack, on the low setting) . The herbicide was applied with a backpack sprayer pressurized with carbon dioxide at 36 psi and equipped with flat-fan nozzles at 19 inches spacing held about 18 inches above the soil surface to deliver a spray volume of 10 gal. Is it necessary to remove the dead grass (sod) prior to reseeding or sodding? Intl. Raking was the whole plot treatment and herbicide was the subplot treatment. It will not be available to home gardeners. per acre applied singly and three times sequentially on a two-week interval with 0.25 percent (v/v) non-ionic surfactant (R-11) or 0.25 percent (v/v) non-ionic surfactant plus 2.5 percent (v/v) UAN solution that contained 28 percent N (Table 1). Weed killers only kill when it's actively growing. Follow the instructions on the label to know how much herbicide to use. Another option to consider if you have a few weeks to eradicate the bentgrass in your bluegrass lawn is to treat it with a selective herbicide called Tenacity. This was a week ago so I don't recall my app rate but it's mostly Bentgrass so I'm happy it's turning white! I didn't want to start a new thread since this seems to be a good source of knowledge on Tenacity & Bentgrass. Best control, according to most research of creeping bentgrass, is achieved if three applications are made on 14-21 day intervals. Unfortunately you cannot apply Prodiamine until next year. If you have other varieties of grass in your lawn, please let me know and I can provide you with recommendations to use for those grasses. Many of Branham’s trials involved testing Tenacity rates and timing to control creeping bentgrass and annual bluegrass in Kentucky bluegrass. Apply the herbicide 3 times, waiting 3-4 weeks in-between applications. If … The rhizomes are very hard to kill and repeated applications of Roundup will be necessary. ITS Annexe-Technical Papers. This is a selective product that will control the bentgrass without harming your desired grasses. 2005. The data for creeping bentgrass control were subjected to statistical analysis. per 1,000 sq. Have creeping bentgrass in your yard? Since the launching of Tenacity (mesotrione) as a turfgrass herbicide by Syngenta in 2009, many studies have been conducted by researchers to take advantage of this unique product. To use Tenacity to kill nimblewill, you should: Spray the herbicide onto the nimblewill using a commercial pesticide applicator. The label recommends using a surfactant and up to three applications. Tenacity can be applied at the seeding to prevent weed germination and allow the turfgrass species to establish without weed competition. We recommend using either Glyphosate 4 (non-selective option) or Tenacity (selective option) to remove creeping bentgrass from your lawn. Irrigation was provided to prevent drought stress. a.i. Yes, you should remove all of the dead bentgrass and lightly till the soil before replanting. I just want a gorgeous lawn and am at a loss with it. Send him your lawn care question today! Hennepin County Minnesota. Be careful — our products will kill any plant they come in contact with, including grass you want to keep. Tenacity can be used as a pre or post-emergent and works to control over 40 different common household weeds and broadleafs. Tenacity Herbicide is a selective pre-emergent and post-emergent weed killer designed to control weeds on turfgrass and lawns. “If there is a contamination of creeping bentgrass in home lawns, there has been no way to get rid of it except using glyphosate and killing everything. Table 1: Treatment list for creeping bentgrass control with Tenacityat different rates, timing, and adjuvant. Discount Code. The raking effects on creeping bentgrass control also appeared the following spring of both years (Table 3). per acre in at least 30 gallons of water per acre at two to three-week intervals for up to three applications with a NIS surfactant. (It is also safe for perennial ryegrass, tall fescue, and the fine-leaf fescues.) Table 2: Effects of dead tissue removal by raking on creeping bentgrass control at different weeks after treatment with Tenacity (values averaged across different rates, timing, and adjuvant). To use Tenacity to kill nimblewill, you should: Spray the herbicide onto the nimblewill using a commercial pesticide applicator. Once Tenacity is applied to the lawn, the bentgrass will turn bright white and be very noticeable, so be prepared that this will happen. Giese, M.S., R.J.Keese, N.E. Our observation in another study also showed low efficacy of Tenacity in creeping bentgrass control under low temperature conditions. It can be used to remove crabgrass, nimbleweed, bentgrass and other difficult to control weeds. Power raking will remove debris before each Tenacity application and allow for the greatest control of creeping bentgrass. Once the grasses die, you can either reseed or re-sod the spots. The first treatment in 2007 was applied on August 17, and the first treatment in 2008 was applied on July 24. The differences between the two years might be attributed to the lower average temperature in 2008 than in 2007, despite the solar radiation of 16.1 MJ m-2 in 2007 vs. 22.5 MJ m-2 in 2008 during the months of study. Five to eight fluid ounces (5-8 oz.) This makes killing spots and reseeding very difficult. One thing you must note is that this herbicide needs to be watered after it dries on the plant so that the plant takes it in. Soc., Champaign, IL. However, it can creep into a home lawn and give the lawn an inconsistent look. Follow the instructions on the label to know how much herbicide to use. Is aerating helpful or necessary? If you’re going to work with your current lawn, then you actually need to start promoting Bentgrass… per acre. Buhler. Creeping bentgrass on putting greens, tees or fairways often escapes to surrounding areas of a different cool-season species. Tenacity will control many monocot and dicot weeds that compete with and slow the establishment of the turfgrass stands. I get how an herbicide could selectively kill broadleaf weeds while leaving grasses alone, but how does it manage to kill bentgrass and poa annua while not harming other turf grasses? Yes, I think all of what you have written above is good. Nitrogen was applied at 2.0 lbs. Take special note of the max Tenacity rate you can apply for your current good grass. ft. per year from potassium sulfate (0N-0P-41.5K) in two equal applications in May and September of both years. Once the Bentgrass takes over, usually the choices are to either eliminate it and start over with Renovation , or to work with what you have. Bentgrass may need more than one application of Tenacity to eliminate. If you enjoyed this article, subscribe to Golfdom to receive more articles just like it. You should spray about 6 inches beyond the patches to make sure you control the stolons, or above-ground runners, that may spread out into the lawn, but are often not visible. Unlike Tenacity, Pylex is not labeled for control of creeping bentgrass. per acre. per acre applied with non-ionic surfactant, whether in one application or in three sequential applications on two-week intervals, provided only moderate creeping bentgrass control under the climate and soil conditions at our experimental site. Bentgrass is a warm season grass. Table 3: Creeping bentgrass control at different weeks after treatment (WAT) with Tenacityat different rates, timing, and adjuvant with values averaged across rake treatments. Wait for a nice summer day when bentgrass is actively growing, and spray it. If you are seeing no effect upon the desirable grass (the good grass is staying green instead of getting whitened), then I don't see why you couldn't continue the Tenacity … Tenacity Herbicide features the active ingredient Mesotrione and can provide year-long control of invasive plants such as chickweed, henbit, and crabgrass, and over 46 other weeds. This herbicide is able to specifically target various … Tenacity is a systemic pre-emergence and post-emergence herbicide for the selective contact and residual control of weeds in turfgrasses. Quackgrass turned white by Tenacity. Fort Lauderdale, Fla. Jones, M.A., and N.E. Soil chemical analysis showed 68 ppm P, 320 ppm K, and pH 7.8. To control nimblewill, start applying mesotrione in the spring (late-April) with a nonionic surfactant at 0.25% (v/v). Best control, according to most research, of creeping bentgrass is achieved if three applications are made on 14-21 day intervals. I made two passes with a fan tip. Christians, and R.E. 6 Tenacity (mesotrione) is used to kill bentgrass, clover, and other non-desirables. I still think I got a little heavy handed in the application. © Spring-Green Lawn Care Corp. All rights reserved. Photo: Deying Li. 2007. Dead leaves of creeping bentgrass caused by an initial Tenacity application may block light penetration to the lower canopy. per acre applied at two-week intervals with both UAN and non-ionic surfactant provided complete control of creeping bentgrass in the spring evaluation one year following the field study (Table 3). Rinehart, A.A. Hathaway, and D.D. Enter yourNeighborhood Tenacity™ has activity against a variety of perennial grassy weeds, including creeping bentgrass. Koger. Calhoun, R.N., G.J. Did you receive a mailing or email from us? Thank you for sending in your question. The active ingredient, Mesotrione 40%, works to prevent photosynthesis from occurring in target weeds so that they cannot grow. My recommendations are based on the assumption that your lawn is composed mostly of bluegrass, ryegrass or turf type tall fescue. and nimblewill (Muhlenbergia schreberi) – Apply Tenacity at 5 fl. Thanks in advance.”. Tenacity™ has activity against a variety of perennial grassy weeds, including creeping bentgrass. Best postemergence control of summer annual grasses occurs when Pylex is applied to plants with fewer than 4 tillers. I have killed creeping bentgrass in my lawn with Roundup. Removal of dead clippings and adding UAN to non-ionic surfactant plus Tenacity provided satisfactory creeping bentgrass control with three sequential treatments at rates of 1.0 oz. Do NOT mix triclopyr with Pylex for use on bentgrass and other highly sensitive species. When used as a pre-emergent, Tenacity works … Over the years I’ve tried many different weed control herbicides for killing crabgrass and broadleafs, not only on my own lawns but on my customers too. While Tenacity will not damage your existing grasses as long as they are cool-season grasses, doing multiple applications, and then core aerating and reseeding or resodding, can be a time-consuming and frustrating process. Tenacity (whose active ingredient is mesotrione) is another herbicide that will kill bentgrass as well as other lawn weeds in your lawn. Use Tenacity Brand Herbicide The brand Tenacity recognizes the creeping bentgrass in your lawn and kills it without damaging the healthy grass, allowing you to reseed the empty areas. Also had blue marker in it so I didn't overspray. Creeping bentgrass will also require a lot of maintenance, and if it does become damaged, you’ll need to make sure that you treat the damaged patch. The raking treatment was applied using a power rake set at 1.2 inches height prior to the first herbicide treatment and weekly thereafter. Reynolds, J.H. Control of bentgrass (Agrostis spp.) 10:1184-1188. Luckily, creeping bentgrass can be controlled with Tenacity herbicide. Photo 1: Tenacity alone bleaches susceptible plants, turning any young and new growth completely white, while Tenacity plus Turflon does not. Do you have a question for Harold? Did you receive a mailing or email from us? Smith, and C.H. Creeping bentgrass control was visually evaluated weekly after the first treatment based on a 0 to100 scale (Camper, 1986), where 0 equals no effect, 1 to 30 equals slight, 31 to 60 equals moderate (rating above 30 considered unacceptable injury), 61 to 99 equals severe injury and 100 equals complete death. Hennepin County Minnesota. The rhizomes are very hard to kill and repeated applications of Roundup will be necessary. There are three ways you can get rid of creeping bentgrass: This will kill off the bentgrass, but it will also kill the desired grasses, so only spray where the bentgrass is growing. Be sure to read and follow the label directions before using the product. I have killed creeping bentgrass in my lawn with Roundup. You're right that MSMA took multiple treatments, but for most of the weeds on the Tenacity label, we can get the same or better control with one application of a cheaper product. of Tenacity herbicide will cover one full acre. Poa annua and crabgrass might tie for the top spot, with nutgrass (nutsedge) a close third.