This selective herbicide was recently approved for use on most cool-season lawns and can be used pre- or post-emergence. Mesotrione controls creeping bentgrass (Agrostis stolonifera) in Kentucky bluegrass. Based on the results of this study, Tenacity should be applied at 1.0 oz. When used as a pre-emergent, Tenacity works … Multiple applications at 4-5 Oz/Acre may thin your Ryegrass in those areas. per acre. 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. Weed killers only kill when it's actively growing. 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. 3rd ed. Intl. It’s all over my lawn in splotches. While there were previously no selective nimblewill herbicides available, the weed can now be controlled or eradicated with an herbicide called Tenacity by Syngenta. Just because it's white or yellow, doesn't mean it's dead or will die. 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). a.i. per acre in each of three sequential applications on two-week intervals using a non-ionic surfactant plus UAN with power raking. 3. Tenacity can be applied at the seeding to prevent weed germination and allow the turfgrass species to establish without weed competition. Tenacity at or below an annual total rate of 3 oz. I have killed creeping bentgrass in my lawn with Roundup. This product will … It can be used to remove crabgrass, nimbleweed, bentgrass and other difficult to control weeds. You will need to make two or three applications. Christians. Check out my Ultimate Guide to Cool-Season Grasses. In both years, adding UAN to non-ionic surfactant improved Tenacity efficacy when applied at either low or high rates. The rhizomes are very hard to kill and repeated applications of Roundup will be necessary. © 2020 North Coast Media LLC, All Rights Reserved. Yes, I think all of what you have written above is good. Creeping bentgrass is a difficult to remove weed typically found on golf courses and mowed short for tees, fairways and greens. The best time to start this process is in mid-July, and it requires three applications, spaced two weeks apart, to achieve complete control. Quackgrass turned white by Tenacity. 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). Enter yourNeighborhood Read and follow label directions carefully prior to use. Five to eight fluid ounces (5-8 oz.) Tenacity (mesotrione) is the first herbicide that results in rapid, easy to visualize reductions in weedy perennial grasses, including creeping bentgrass. It is bright green but does have a hint of blue in it as well. The single treatment was applied at the same time as the first application of the sequential treatments. When used as a pre-emergent: Description. 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). Multiple applications at 4-5 Oz/Acre may thin your Ryegrass in those areas. 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? © Spring-Green Lawn Care Corp. All rights reserved. 2007. Take special note of the max Tenacity rate you can apply for your current good grass. grasses (Figure 2). Tenacity (mesotrione) is a systemic herbicide that selectively controls nimblewill in bluegrass lawns. The results are undesirable visual quality, poor playing conditions and scalping. Apply at grass seeding or close to seeding for best performance. I have killed creeping bentgrass in my lawn with Roundup. Apply at grass seeding or close to seeding for best performance. Tenacity can be used on grass seed blends that contain less than 20% by weight of hard or fine fescue. Dead leaves of creeping bentgrass caused by an initial Tenacity application may block light penetration to the lower canopy. Weed Science 55:406-411. Leaf tissue of Tenacity treated creeping bentgrass has turned brown. Hennepin County Minnesota. Weed Technology. 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. Bentgrass may need more than one application of Tenacity to eliminate. He can be reached at deying.li@ndsu.edu. Did you receive a mailing or email from us? Thanks in advance.”. I just want a gorgeous lawn and am at a loss with it. Nitrogen was applied at 2.0 lbs. 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. 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. 10:1184-1188. Tenacity … It indicates that temperature and sunlight intensity both impact the efficacy of Tenacity. The rhizomes are very hard to kill and repeated applications of Roundup will be necessary. 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. Raking was the whole plot treatment and herbicide was the subplot treatment. Send him your lawn care question today! per acre. 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! Tenacity may reduce density of fine fescue seedings. What weeds will tenacity kill? ft. per year from polymer coated sulfur-coated urea (43N-0P-0K) in two equal applications in May and September of both years. The best time to use Round-Up is when the grass is actively growing and not under heat or drought stress. Luckily, creeping bentgrass can be controlled with Tenacity herbicide. Many of Branham’s trials involved testing Tenacity rates and timing to control creeping bentgrass and annual bluegrass in Kentucky bluegrass. 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). Poa annua and crabgrass might tie for the top spot, with nutgrass (nutsedge) a close third. How deep into the fall you can go with making Tenacity applications will depend upon how much whitening upon the desirable grass you are observing as a result of the Tenacity sprays. I don’t see why the seeds won’t be able to germinate through the low bentgrass areas. per 1,000 sq. Tenacity can only be applied by lawn care professionals. Learn more about bentgrass and useful control methods at http://www.spring-green.com. 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. In: D. Thorogood (ed.). Best postemergence control of summer annual grasses occurs when Pylex is applied to plants with fewer than 4 tillers. Apply the herbicide 3 times, waiting 3-4 weeks in-between applications. I didn't want to start a new thread since this seems to be a good source of knowledge on Tenacity & Bentgrass. Tenacity selectively controls bentgrass out of Kentucky … 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. Spraying now is likely not to have much impact. Without carotenoids, excessive light energy destroys chlorophyll and causes new growth to appear white before necrosis and death (Giese et al., 2005). In addition to non-ionic surfactant (NIS), could other adjuvants, such as urea ammonium nitrate (UAN), improve the herbicide absorption (Dodds et al., 2007)? 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 will control many monocot and dicot weeds that compete with and slow the establishment of the turfgrass stands. Bentgrass actively grows in the heat of summer. Post by southern-ct-4 » September 11th, 2020, 3:59 pm The part at the top middle of the pic (near the shrubs by the end of the driveway) is stark white (as are some smaller areas to the right along the driveway). The first treatment in 2007 was applied on August 17, and the first treatment in 2008 was applied on July 24. ITS Annexe-Technical Papers. lawn weed-control turf herbicide oz. Best control, according to most research of creeping bentgrass, is achieved if three applications are made on 14-21 day intervals. We recommend using either Glyphosate 4 (non-selective option) or Tenacity (selective option) to remove creeping bentgrass from your lawn. Tenacity is the best herbicide to use when seeding cool-season grass (except bentgrasses). Be careful — our products will kill any plant they come in contact with, including grass you want to keep. Control of bentgrass (Agrostis spp.) 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. 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. 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. The clippings were manually collected and removed using a spring rake. If you make three applications, use the 5 fl oz/A rate (or 6, 6 and 4 fl oz/A). This can be done at the same time of seeding. My recommendations are based on the assumption that your lawn is composed mostly of bluegrass, ryegrass or turf type tall fescue. It will not be available to home gardeners. I watched your video about it but you didn’t mention what I could use to get rid of it. 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