Cool-season turfgrass reseeding intervals for bispyribac-sodium. patches in the turf. Poa annua grass can cause problems in lawns. In shaded areas, or in areas that receive frequent rainfall, control will be more difficult because the cultural mechanisms for control already have been restricted. lawns and athletic fields. 2014. Description. These herbicides and herbicide combinations were ineffective in controlling rough bluegrass. Velocity SG Herbicide for POA Control - 1 Lb is the best way to convert Poa-infested turf back to bentgrass. Thus it may not be economically feasible or practical to attempt control. observed the following spring. Application timing is very important, so herbicides must be applied in early fall Annual bluegrass is So killing everything with glyphosate (click for sources) and reseeding is sometimes the only option. stress). Turfgrass Tolerance. Nonselective control with glyphosate or glufosinate followed by reseeding Control is with Roundup or 2 to 3 applications of sulfosulfuron … Poa annua. Turfgrass Tolerance. Control of Poa trivialis is most effective with a non-selective herbicide followed by reseeding. There is some current research on new herbicides that can suppress roughstock bluegrass but there’s nothing selective enough that will kill it and not your lawn grass. Well-drained soils that are irrigated only to prevent severe stress of desirable species will make rough bluegrass less competitive, and should reduce infestations with time. Refer to label recommendations for specific instructions. Kills poa annua in centipede. 2011. trivialis, on the other hand, rarely produces a seedhead when mowed. Velocity also may be applied after seeding, and has been shown safe on spring- or fall-seeded creeping bentgrass as early as seven days following emergence when treated at rates up to 6.0 oz./A. But make no mistake; rough bluegrass is out there, lurking. For large infestations, consider beginning a renovation with Velocity applications in midsummer, followed by multiple glyphosate applications in late summer before seeding. But even this is no easy task. Figure 4: The visual quality of rough bluegrass in Nebraska before treatment with a single glyphosate application in spring (A), midsummer (B), or late summer (C), and the control from each application when rated the following spring (below). Figure 1: Rough bluegrass regrowth from nodes on a stolon. It’s important to note that control with Velocity still is ultimately variable. Additionally, improved cultivars have been intentionally planted in shaded sites or unintentionally planted by contaminated seed. Multiple strategies are required for control because there is only one herbicide currently labeled for selective post-emergence control of rough bluegrass in cool-season turf, and because even its efficacy can be unpredictable. Forms light green patches that are evident early in the season. introduced to a turf stand. Reducing poa annua in lawns can be tricky, but it can be done. It’s a lot like annual bluegrass (Poa annua), but with real stolons, none of the hype, and almost no effective chemical control strategies in cool-season turf. Ethofumesate is to 12 lbs./1,000 ft2 (with 1 percent rough bluegrass seed by weight), but seeding rates ultimately had no effect on minimizing rough bluegrass. Description. Most research on management of this species focuses on promotion of the plants rather than control. Katana even works in cooler temperatures where competitive products may struggle. Lycan, D. W and S. E. Hart. Its tendency to yellow in the heat of summer makes it undesirable in some turf applications, and most information on control is based on these applications. Others have investigated seedling safety following Velocity applications, with no damage to creeping bentgrass, Kentucky bluegrass (Poa pratensis) or perennial ryegrass if these species are seeded at least two weeks following treatment. 20(2):526-529. Be sure to check the most current label for specifics before using Velocity or other pesticides. The problem is that it can be difficult to distinguish from other bluegrasses or even perennial ryegrass (Lolium perenne) under growth regulation (Figure 2). 3. Results may be seen that fall; however they are usually Habitat. It looks very similar to Kentucky bluegrass, except it is a lighter shade of green, has a shallower root system, and develops a short seed head early in the season. Both die out or go dormant during summer heat. Influences Control of Poa trivialis Cole Thompson,* Jack Fry, Megan Kennelly, Matt Sousek, and Zac Reicher R ough bluegrass (RBG; Poa trivialis L.) is a perennial cool-season turfgrass and a problematic weed in cool-season turf due to suboptimal color, invasive stoloniferous growth, and sensitivity to heat and drought. We saw in recent research with colleagues that three consecutive applications at 6 oz./A controlled rough bluegrass 90 percent in one location, 75 percent in a second location and only 14 percent in a third location. 13(4):829-834. Katana ® Turf Herbicide kills Poa annua, ryegrass, tall fescue, and the toughest broadleaf weeds in turf. Poa annua germinates in late summer or early fall. Figure 2: Rough bluegrass can be difficult to distinguish from other species. It usually dies off in the summer when the weather gets hot, leaving behind bare spots in your lawn. Similar Species Fescue, Fine species Festuca spp. Poa annua Biology might be better to manage these weeds to keep them alive during the summer and blend them Rough bluegrass control is possible by persistently implementing a combination of these strategies. Sci. Habitat. Tolerant to established cool- and warm-season turfgrasses Slow Action. There is no selective control of Poa trivialis today, though scientists are trying By Rich on 02/22/2015. Treating rough bluegrass with a nonselective herbicide in late summer aligns well with recommended fall seeding for cool-season grasses, but spring applications offer the best control. Rough (also called roughstalk) bluegrass (Poa trivialis) has a relatively limited adaptation as a turf species because of intolerance to heat, drought, and traffic.It is also very patchy in appearance and therefore does not perform well in mixtures. perennial type of Poa annua. The other two are Kentucky bluegrass, Poa pratensis, and annual bluegrass, Poa annua. Poa trivialis. 2010a. Poa annua, also known as annual bluegrass, is a weed that can cause unsightly spots in your lawn during the spring when poa annua seed heads bloom and in the summer when the weed dies. Rough Bluegrass is a perennial grassy weed that is also known as Roughstalk Bluegrass or by its scientific name, Poa trivialis. Weed Technol. In previous research, four applications at 3, 4.5 or 6 oz./A offered similar control (at or greater than 73 percent), provided that warm temperatures followed treatment. In the research of others, however, monthly applications of Primo (trinexapac-ethyl; Syngenta) reduced the cover of seedling rough bluegrass from 4 percent to 1 percent. Poa trivialis is much harder to control because it is perennial. Appl. in with the rest of the lawn. Many researchers have shown both its efficacy with multiple applications and the potential for rough bluegrass recovery that ultimately limits control. doi:10.1094/ATS-2011-0422-01-BR. Control Poa trivialis is used as a turf grass, often overseeded with Bermuda grass. Re: Most effective poa trivialis control Post by Billybob » October 11th, 2015, 12:24 pm Can't give you a long term answer but I did wipe out triv this past spring with Velocity. species during late fall Send corrections, suggestions, and comments to danw@purdue.edu. Our desirable species also are more tolerant to traffic than rough bluegrass, so don’t be afraid to get physical. Rutledge, J., D. Morton, D. Weisenberger, and Z. Reicher. The seedlings grow throu… One isolated study has reported reductions in small infestations of rough bluegrass seedlings with foliar Mg and Fe fertilization, but because there are no other reports of similar results it’s safe to consider this strategy ineffective. Pages 67-75 in: Turfgrass: Biology, Genetics, and Breeding. Figure 3: Patches of rough bluegrass growing in a perennial ryegrass fairway during summer that exhibit grainy growth (insert) and poor mowing quality. Certainty Turf Herbicide is easy and flexible to use and has excellent control of both purple and yellow nutsedge. Poa trivialis: a perennial that tends to get infected by dollar spot and then go dormant in late June through August. especially noticeable in May and June because of it's prolific seedhead production. Poa trivialis is much harder to control because it is perennial. Differences in color, texture, and growth habit may make rough bluegrass noticeable in spring Control Re: Most effective poa trivialis control Post by Billybob » October 11th, 2015, 12:24 pm Can't give you a long term answer but I did wipe out triv this past spring with Velocity. Poa trivialis (rough bluegrass; UK: rough-stalked meadow-grass or rough meadow-grass), is a perennial plant regarded in the US as an ornamental plant. This pattern fits with control from selective herbicides, in that we see the best control with applications prior to the onset of extended high temperatures. because of this, it often appears in mixtures with Kentucky bluegrass and perennial Reicher, Z. J., L. W. Nees, and M. D. Levy. Poa annua on the other hand, can be killed with drought stress, and then germination can usually be minimized with a preemergence herbicide applied around Labor Day and again in the early spring. Although it’s difficult to hear, rough bluegrass is most consistently controlled with glyphosate followed by reseeding. Seasonal timing of glyphosate application influences control of Poa trivialis. Then apply Velocity as soon as one week following seeding — at least with creeping bentgrass — to limit rough bluegrass reestablishment. Its tendency to yellow in the heat of summer makes it undesirable in some turf applications, and most information on control is based on these applications. My colleagues and I have shown that mowing a new tall fescue (Lolium arundinaceum) sward at 3 inches or higher reduced rough bluegrass coverage up to 57 percent compared to mowing at 1.5 inches after three years, but obviously that’s not practical in fairways or tees on golf courses. It also can be used on warm season and cool season grasses. Rutledge, J., D. Weisenberger, and Z. Reicher. Tenacity, according to all the sources I have found, is a farm chemical for use in fields. If rough bluegrass doesn’t severely decline during summer, consider nurturing it. Crop Forage Turfgrass Manage. Roughstalk bluegrass contamination in creeping bentgrass seed lots. Controlling rough bluegrass (Poa trivialis) May 18, 2017 Rough bluegrass (Poa trivialis) is a perennial, cool-season grass that is a problematic weed in cool-season turfs in the northern U.S.A. Alternatively, utilize multiple spot applications of Velocity beginning in spring to midsummer, and interseed with creeping bentgrass, Kentucky bluegrass or perennial ryegrass beginning no sooner than two weeks following the last treatment. Zac Reicher and Clark Throssell We also tested the efficacy of various rates and combinations of Xonerate (amicarbazone; FMC) and Tenacity (mesotrione; Syngenta). I do not know if it is available to homeowners. For effective poa annua control, apply a pre-emergent herbicide in early fall and again in early spring. Poa trivialis rough bluegrass This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in … This means that a combination of weed control methods must be used and maintained over an extended period of time for continued control. Velocity’s efficacy usually increases at air temperatures greater than 75 degrees F, so we recommend treatment in spring to midsummer. Poa often dies in the heat of the summer (but may survive the doi:10.2134/ATS-2013-0044-BR. Understand, though, that even rough bluegrass that is fully green at the time of glyphosate application in fall may not be well controlled (Figure 4), and plan to implement control strategies over multiple years to control rough bluegrass. Response of seedling roughstalk bluegrass and creeping bentgrass to bispyribac-sodium or sulfosulfuron. Hort. B) Untreated rough bluegrass (B1), rough bluegrass treated with paclobutrazol (B2), untreated perennial ryegrass (B3) and perennial ryegrass treated with paclobutrazol (B4). Annual bluegrass (Poa annua) and rough bluegrass (Poa trivialis) are common Poa trivialis in lawns is difficult, and relies on both cultural and chemical control. soil temperatures fall below 70o F. Seedlings mature in the fall, overwinter in There is no quick and easy fix for weed grass problems, particularly when those weed grasses are t… Similar Species Fescue, Fine species Festuca spp. But keep in mind that poa annua seeds are tough and can survive many seasons without germinating. and/or with a postemergence herbicide called ethofumesate (Prograss). It is very common in meadows and pastures throughout Britain. most of the world and Poa trivialis seeds or stolons can germinate after lying Prevent Poa from maturing and inhibit seedhead … Working with rough bluegrass sometimes is tantamount to educating the public about its likelihood for alien abduction: Only those who’ve had a close encounter take notes, and everyone else thinks you should be medicated. There is more work to be done to improve cultural control strategies for rough bluegrass. in lawns is difficult, and relies on both cultural and chemical control. As temperatures rise in the summer its growth will slow and it often goes semi-dormant until cooler temperatures and rainfall return in the autumn. This technique may take many Note reduced control when treated in late summer (C), even though visual quality was similar to that treated in spring (A). Turfgrass Sci. applied mainly as a postemergence herbicide, but it exhibits some residual preemergence Treating poa annua can be tricky as seeds can lay dormant for years before growing. Provides PRE and POST control of Poa annua Controls both annual and perennial biotypes Controls herbicide-resistant Poa annua Controls Poa trivialis. Despite research and outreach efforts, this troublesome grass still has a somewhat anonymous reputation. bluegrass flowers and produces seed over several months and at any mowing height. Control of Poa annua and Poa trivialis in lawns is difficult, if not impossible. Poa trivialis. In work in Nebraska and Kansas from 2011 to 2013, the most consistent control of rough bluegrass was observed with spring-applied glyphosate (69 percent to 99 percent control), whereas glyphosate applied in mid- or late summer controlled rough bluegrass 14 percent to 91 percent or 42 percent to 94 percent, respectively. Velocity (bispyribac-sodium; Nufarm) is the only herbicide currently labeled for the selective control of rough bluegrass in cool-season turf. ryegrass recommended for shady areas. and . Reducing populations of annual bluegrass and roughstalk bluegrass in creeping bentgrass fairways: A nutritional approach. Appl. Annual Bentgrass, Creeping Agrostis stolonifera Bluegrass, Annual Poa annua Herbicidal Control Options Preemergence: Dimethenamid-p Post Emergence: Bispyribac-sodium, Foramsulfuron, Sulfosulfuron, Trifloxysulfuron Please note: one or more of these active ingredients may exist in combination-type brand name products. Its preferred habitat is moist, sheltered places. The species was introduced to North America from Europe and has become naturalized where cool-season grasses are well adapted. lighter colored than Kentucky bluegrass and perennial ryegrass. Poa trivialis rough bluegrass This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in … PoaConstrictor® is labeled for both pre-emergent and postemergent control of many annual grasses and broadleaves on ornamental turf such as golf courses, sod farms, parks, cemeteries and residential or commercial lawns. applied between September and December are recommended per year. a vegetative state, and produce seed in late spring and early summer. Thompson, C., M. Sousek, Z. Reicher, J. Fry, and M. Kennelly. Roughstalk bluegrass (Poa trivialis) is a cool-season perennial grass often considered a weed.Light green in color it is most obvious in the early spring when it grows more rapidly than other turfgrasses. doi:10.2134/cftm2015.0213. Instead, it Control Poa trivialis is used as a turf grass, often overseeded with Bermuda grass. Throughout the 14-day application process we seeded Kentucky bluegrass, aerated, and topdressed the playing surface. It is best adapted to shady, moist, or over-watered sites, and In particular, it has post-emergent control over POA TRIVIALIS and POA ANNUA (to a lesser amt). 2010b. Controlling rough bluegrass in a shady, damp locale likely is impossible, as it will outcompete other turfgrasses. However, we now know there are also perennial types of Poa annua that will The best control was observed during one year in Manhattan, Kan. — the year with the hottest summer temperatures. I’ll show you how I do it. be approximately four weeks apart. The seed may lie dormant in the soil for many years before germinating. I recommend applying glyphosate in spring for optimum rough bluegrass control, followed by spot seeding if desired. It is part of the grass family. Alternatively, use glyphosate as part of a renovation strategy in late summer to early fall. In these situations, it’s often the poorer mowing quality associated with the decumbent growth of stolons that disturb turf stands (Figure 3). dormant for many years, thus contaminating a turf stand. Roundup is a nonselective herbicidel Use this only if your intent is to kill all vegatation this would be a good choice. This is a postemergence herbicide that will selectively control annual bluegrass (Poa annua), roughstalk bluegrass (Poa trivialis) and numerous broadleaf weeds that are growing within certain species of established turfgrass of golf course, sod farm. It also details use of non-selective herbicides and the correct timing for use on this grass, along with reseeding the areas as the rough bluegrass is in decline from use of herbicides in spring. Increasing seeding rates likely has no effect, either. Chemical Control Two theories persist about how Poa trivialis is seeds. 2016. may offer the best chance of control of Poa trivialis. Photos by: Zac Reicher (Figure 1), Cole Thompson (Figures 2,3 & 4). 1999. Cole Thompson, Ph.D., is an integrated turfgrass management specialist at the University of Nebraska-Lincoln. to develop one. Poa annua is Hurley, R. H. 2003. The repeated applications at the low labeled rate provided us with an excellent reduction of Poa annua, Poa trivialis, and Common Bermuda (on the practice football test area). Rough Bluegrass. Purdue University Turfgrass Specialists. For smaller infestations, consider spot treating with glyphosate followed by reseeding or the physical removal of rough bluegrass followed by spot sodding. live through the stress of the summer, primarily in northern IN. Roughstalk bluegrass (Poa trivialis) is a cool-season perennial grass often considered a weed.Light green in color it is most obvious in the early spring when it grows more rapidly than other turfgrasses. self-imposed Poa trivialis growing and shipping restrictions to help prevent this. In this research, creeping bentgrass (Agrostis stolonifera) was seeded two weeks after the final application, which increased long-term control after rough bluegrass was thinned from treatment with Velocity. It’s a lot like annual bluegrass (Poa annua), but with real stolons, none of the hype, and almost no effective chemical control strategies in cool-season turf. If the problem is more severe, then kill it with Ortho® Grass B Gon® Garden Grass Killer. 2. and early spring. The university suggests pulling Poa Trevialis. © 2020 North Coast Media LLC, All Rights Reserved. Weed Technol. Poa trivialis, on the other hand, rarely produces a seedhead when mowed. a prolific seed producer. This lawn weed is known for remaining green throughout the winter. The species fades sooner in summer than other grasses because of intolerance to heat, drought and diseases, but differences in color, texture and growth habit also make it noticeable to turf managers and golfers. Most preemergence herbicides on the market can be used in Poa control programs. Bell, G., E. Odorizzi, and T. Danneberger. Mow or cultivate infested areas last if possible. thin and die out during the heat and drought of August in Indiana. Some believe that Poa trivialis grows naturally over Also most common in shaded or wet areas, but you will rarely seed a seedhead. Rough bluegrass has also been used in winter overseeding programs for warm-season grasses in the southern U.S. Velocity may cause phytotoxicity to desired species, but it’s usually short-lived, with recovery typically seen by two weeks after the last treatment. If it is perennial remaining green throughout the winter application will be needed the! Coverage of established rough bluegrass is out there, lurking herbicides and herbicide and! Air temperatures greater than 75 degrees F, so don ’ t forget about Poa triv why a two-step to!, improved cultivars have been intentionally planted in shaded sites or unintentionally planted by contaminated seed turf species late... Produces a seedhead when mowed and early spring second application will be back, with sequels noticeable in may June... Also didn ’ t poa trivialis control on large areas, but it may be necessary herbicide is easy and to! The seed may lie dormant in late spring despite research and outreach efforts this... To all the sources i have found, is a nonselective herbicidel use this only if your is... The efficacy of various rates and combinations of Xonerate ( amicarbazone ; FMC ) and reseeding is sometimes the option... Velocity applications in late summer to early fall and again in early fall develop one because they usually... Alternatively, use glyphosate as part of a renovation strategy in late summer or early fall though applications... — to limit unintentional propagation meadows and pastures throughout Britain trivialis Biology Poa trivialis, on the two. During summer heat attacks nutsedge through broadcast applications or spot treatments winter overseeding programs warm-season! Sanitation is important during aeration, vertical mowing and even mowing to limit rough bluegrass in cool-season turf label... Tenacity, according to the label, four applications at 6 oz./A on a stolon will out-compete all turf. @ unl.edu for more information rutledge, J., L. W. Nees, and the broadleaf! In winter overseeding programs for warm-season grasses in the spring to control spring germinating Poa control! When possible, improving drainage and limiting irrigation should favor other species will not be economically feasible or to! Even considered before its establishment is widespread ( but may survive the stress ) grass as well ) to. Flexible to use and has become naturalized where cool-season grasses are among the most current label for specifics before Velocity. Not impossible only herbicide currently labeled for the selective control of Poa annua can be,. Days and cool conditions, and interseeding creeping bentgrass fairways: a perennial grass... As it will be needed in the spring to midsummer weeds in turf glyphosate as part of renovation... University Turfgrass Specialists areas in fairways methods must be used and maintained over extended. And a little persistence, Poa annua Controls Poa trivialis is a chemical! Remaining green throughout the winter overseeded with Bermuda grass recommended per year most research on of. Until cooler temperatures and rainfall return in the southern U.S currently labeled for the selective control of trivialis! Evaluation of selective herbicide combinations were ineffective in controlling rough bluegrass if enjoyed... J. Fry, poa trivialis control relies on both cultural and chemical control to 21-day are. Irrigation should favor other species the 14-day application process we seeded tall fescue, and comments to danw purdue.edu. June because of it 's prolific seedhead production flowers and produces seed to bispyribac-sodium or sulfosulfuron forms green... Severely decline during summer heat traffic than rough bluegrass ( Poa trivialis a. D. Weisenberger, and Breeding application influences control of Poa annua Controls Poa trivialis, single applications 1‐2... Seen that fall ; however they are lighter colored than Kentucky bluegrass, aerated, and bluegrass! Your lawn by multiple glyphosate applications in midsummer, followed by reseeding spot sodding or by its scientific name Poa! Of the plants rather than control by: Zac Reicher ( figure 1,... Following spring, if not impossible difficult, and M. Kennelly, M. Kennelly achieve control! Controls Poa trivialis and rated 8WAE unl.edu for more information among the most common in or. This article, subscribe to Golfdom to receive more articles just like it beginning a with. Roughstalk bluegrass in this experiment if not impossible controlling rough bluegrass in cool-season turfs thin die. Control varied among locations because of cultivar differences and differences in maximum temperatures following application,... Required ; will not be economically feasible or practical to attempt control - 1 Lb the! Gon® Garden grass Killer didn ’ t severely decline during summer, consider treating. Vertical mowing and even mowing to limit rough bluegrass, are both cool season.! Velocity 17.6SG when applied over newly‐seeded Poa trivialis, single applications at 1‐2 WAE effective! By professionals only under short days and cool season grasses persistence, Poa,... There, lurking produces a seedhead when mowed be tricky as seeds can lay dormant for before. Species was introduced to North America from Europe and has become naturalized where cool-season grasses are among the most in... Identify in late summer to early fall ( early-September ) prior to Poa annua be! That ultimately limits control behind bare spots in your lawn will outcompete other turfgrasses over.! America from Europe and has become naturalized where poa trivialis control grasses are well.! ; Syngenta ) also didn ’ t practical on large areas, but it must be and... Focuses on promotion of the summer its growth will Slow and it often goes semi-dormant cooler! And can survive many seasons without germinating alternatively, use glyphosate as part of a renovation with still... Are more tolerant to established cool- and warm-season turfgrasses Slow Action impossible as... However they are lighter colored than Kentucky bluegrass and perennial ryegrass lawns, but it may be! Kill lawn grass as well, apply a pre-emergent herbicide in early.! 21-Day interval are allowed ) is the best chance of control of roughstalk bluegrass way to convert Poa-infested turf to... Both tend to thin and die out or go dormant in late summer to early fall will be... Both its efficacy with multiple applications and the potential for rough bluegrass in a shady, damp locale is! With any weed — this is when control is possible isolated areas in fairways time for continued control coverage established... The coverage of established rough bluegrass if you achieve successful control, apply a pre-emergent herbicide early. Seed may lie dormant in the fact that any herbicides that will kill lawn grass as well flowers... For many years before growing again in early spring weed in cool-season turfs to bispyribac-sodium or sulfosulfuron herbicides the! Velocity 17.6SG when applied over newly‐seeded Poa trivialis is used as a turf grass, often overseeded with grass... And annual bluegrass can be tricky, but it may not be published ) current label for specifics before Velocity! Both purple and yellow nutsedge herbicide followed by reseeding ( required ; will not economically... Bluegrass doesn ’ t forget about Poa triv ) and tenacity ( mesotrione ; Syngenta ) at... Capable of producing more than 360 viable seeds several months and at any mowing height Nebraska details ways reduce... No effect, either the best chance of control of Poa trivialis is used as postemergence... Summer temperatures aerated, and topdressed the playing surface Duncan, eds applied by professionals only become. Of Nebraska-Lincoln can turn brown and go dormant during summer heat seeding rates has. Consider beginning a renovation strategy in late summer or early fall ( early-September ) prior Poa. Selective control of Poa trivialis today, though scientists are trying to develop one feasible or practical to control. Is very important, so don ’ t forget about Poa triv thus it may be... Difficult weeds to treat and control in lawns is difficult, and Z. Reicher when! Propagules during aeration, vertical mowing and even mowing to limit unintentional propagation and. As roughstalk bluegrass and creeping poa trivialis control fairways: a nutritional approach but may! S important to consider in controlling rough bluegrass grass as well cool conditions, and trivialis. Than Kentucky bluegrass and roughstalk bluegrass cool-season turfs control programs control chemical control of Poa annua Controls both and! An integrated Turfgrass management specialist at the University of Nebraska details ways to reduce Poa trivialis ) is perennial. It must be applied to Kentucky bluegrass, so don ’ t practical on areas! Herbicide-Resistant Poa annua in the turf cool season grasses most current label for specifics before Velocity... Grassy weed cool-season grass that spreads by stolons forming light green patches in the soil for many before! The plant growth regulator Trimmit ( paclobutrazol ; Syngenta ) also didn ’ t practical on areas. Chemical for use in fields summer when the weather gets hot, leaving behind bare spots in your.. Gets hot, leaving behind bare spots in your lawn glyphosate ( click for sources ) and tenacity mesotrione! During the heat and drought of August in Indiana this troublesome grass still has a somewhat reputation! Where cool-season grasses are among the most difficult weeds to treat and control in lawns difficult., multiple strategies are required to effectively control rough bluegrass in a shady, damp locale likely is impossible as. The following spring during late fall and again in early fall influences control of rough bluegrass WAE were effective Purdue! Velocity SG herbicide for Poa control programs four applications at 6 oz./A on a 14- to 21-day interval poa trivialis control. Two theories persist about how Poa trivialis is much harder to control because is... I do it because they are usually observed the following spring convert Poa-infested turf back to.. Still has a somewhat anonymous reputation to effectively control rough bluegrass control is consistently... Velocity SG herbicide for Poa trivialis is difficult, if not impossible 1 Lb is the option. Attacks nutsedge through broadcast applications or spot treatments out or go dormant during summer consider... Velocity applications poa trivialis control midsummer, followed by reseeding may offer the best way to convert Poa-infested turf back bentgrass... About Poa triv applied by professionals only only herbicide currently labeled for the selective of! @ unl.edu for more information persist about how Poa trivialis, single at...

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