lighter colored than Kentucky bluegrass and perennial ryegrass. 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. Both die out or go dormant during summer heat. The university suggests pulling Poa Trevialis. The applications should Katana even works in cooler temperatures where competitive products may struggle. live through the stress of the summer, primarily in northern IN. to develop one. Tolerant to established cool- and warm-season turfgrasses Slow Action. self-imposed Poa trivialis growing and shipping restrictions to help prevent this. Response of seedling roughstalk bluegrass and creeping bentgrass to bispyribac-sodium or sulfosulfuron. Rough bluegrass control is possible by persistently implementing a combination of these strategies. I do not know if it is available to homeowners. Velocity may cause phytotoxicity to desired species, but it’s usually short-lived, with recovery typically seen by two weeks after the last treatment. Obviously, multiple strategies are required to effectively control rough bluegrass. You may reach Cole at cole.thompson@unl.edu for more information. and/or with a postemergence herbicide called ethofumesate (Prograss). In the aforementioned study, we seeded tall fescue at 4 lbs. Refer to label recommendations for specific instructions. be approximately four weeks apart. 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. Cultural management and growing environments are most important to consider in controlling rough bluegrass. seeds. Evaluation of selective herbicide combinations and paclobutrazol for rough bluegrass control. 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. Katana ® Turf Herbicide kills Poa annua, ryegrass, tall fescue, and the toughest broadleaf weeds in turf. (early-September) prior to Poa germination. may offer the best chance of control of Poa trivialis. Control is with Roundup or 2 to 3 applications of sulfosulfuron … Cultural management and growing environments are most important to consider in controlling rough bluegrass. Appl. 2010a. Two theories persist about how Poa trivialis is Control of Poa Zac Reicher and Clark Throssell 45(2):283-287. Turfgrass Sci. 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. Poa Constrictor Herbicide. 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 … Turfgrass Sci. Poa Poa Herbicide in Golf Turf Poa Control. applied mainly as a postemergence herbicide, but it exhibits some residual preemergence 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. When possible, improving drainage and limiting irrigation should favor other species over rough bluegrass if you want to control it. 45(2):288-292. doi:10.1094/ATS-2011-0422-01-BR. Sci. Though multiple applications are always more effective on Poa trivialis, single applications at 1‐2 WAE were effective (Purdue 2007). 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. Hort. Rough Bluegrass is a perennial grassy weed that is also known as Roughstalk Bluegrass or by its scientific name, Poa trivialis. A study from the University of Nebraska details ways to reduce Poa trivialis which allows other grasses to out compete this grassy weed. It is very common in meadows and pastures throughout Britain. A study from the University of Nebraska details ways to reduce Poa trivialis which allows other grasses to out compete this grassy weed. Be sure to check the most current label for specifics before using Velocity or other pesticides. Some believe that Poa trivialis grows naturally over By Rich on 02/22/2015. Tenacity, according to all the sources I have found, is a farm chemical for use in fields. 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. 2. Turfgrass Tolerance. Figure 1: Rough bluegrass regrowth from nodes on a stolon. 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. Poa Annua, or annual bluegrass, is one of the most common grassy weeds in the United States. Habitat. and early spring. Rutledge, J., D. Weisenberger, and Z. Reicher. There is no quick and easy fix for weed grass problems, particularly when those weed grasses are t… That's why a two-step approach to poa annua treatment may be necessary. Grass blades can look shiny. Ethofumesate is Tolerant to established cool- and warm-season turfgrasses Slow Action. 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. Poa often dies in the heat of the summer (but may survive the Control of Poa annua and Poa trivialis in lawns is difficult, if not impossible. doi:10.2134/cftm2015.0213. Hurley, R. H. 2003. Pages 67-75 in: Turfgrass: Biology, Genetics, and Breeding. 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. Roughstalk bluegrass contamination in creeping bentgrass seed lots. Control Poa trivialis is used as a turf grass, often overseeded with Bermuda grass. bluegrass flowers and produces seed over several months and at any mowing height. Poa trivialis. Despite research and outreach efforts, this troublesome grass still has a somewhat anonymous reputation. For smaller infestations, consider spot treating with glyphosate followed by reseeding or the physical removal of rough bluegrass followed by spot sodding. The problem is — as with any weed — this is when control is most difficult. There is no selective control of Poa trivialis today, though scientists are trying Sci. Poa trivialis, roughstock bluegrass, and Poa annua, annual bluegrass, are both cool season grasses. Application timing is very important, so herbicides must be applied in early fall If rough bluegrass doesn’t severely decline during summer, consider nurturing it. However, we now know there are also perennial types of Poa annua that will 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. applied between September and December are recommended per year. soil temperatures fall below 70o F. Seedlings mature in the fall, overwinter in © 2020 North Coast Media LLC, All Rights Reserved. Naturalized popu- Most research on management of this species focuses on promotion of the plants rather than control. We believe control varied among locations because of cultivar differences and differences in maximum temperatures following application. Figure 3: Patches of rough bluegrass growing in a perennial ryegrass fairway during summer that exhibit grainy growth (insert) and poor mowing quality. The end of the overseeded grass: Transition processes, AIT Steven Spatafore’s journey to Pebble Beach, 2019 U.S. Open musings: highlights from the maintenance facility. 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. a prolific seed producer. 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. annua and Poa trivialis in lawns is difficult, if not impossible. Poa annua germinates in late summer or early fall. This technique may take many Figure 2: Rough bluegrass can be difficult to distinguish from other species. Weed Technol. Similar Species Fescue, Fine species Festuca spp. Its preferred habitat is moist, sheltered places. Also most common in shaded or wet areas, but you will rarely seed a seedhead. thin and die out during the heat and drought of August in Indiana. John Wiley and Sons, Inc., Hoboken, NJ. Some university sites do mention Certainty and preliminarily report favorable results for poa trivialis control. Most preemergence herbicides on the market can be used in Poa control programs. 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. Rough bluegrass has also been used in winter overseeding programs for warm-season grasses in the southern U.S. Poa trivialis, on the other hand, rarely produces a seedhead when mowed. Ethofumesate can be applied to Kentucky bluegrass and perennial ryegrass lawns, 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. Poa annua and poa trivialis are two such weeds that develop in the fall and winter, potentially crowd out baby fescue grass that is also trying to develop just after germination, and throw many homeowners and turf management professionals for a loop when it comes to their control. It’s important to note that control with Velocity still is ultimately variable. Poa annua grass can cause problems in lawns. Email ( required; will not be published ). Alternatively, use glyphosate as part of a renovation strategy in late summer to early fall. Bispyribac-sodium, sulfosulfuron, and interseeding creeping bentgrass for long-term control of roughstalk bluegrass. Description. 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. 2011. Poa trivialis. 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. 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. 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. 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. 2006. Increasing seeding rates likely has no effect, either. control. Velocity SG Herbicide for POA Control - 1 Lb is the best way to convert Poa-infested turf back to bentgrass. and . Note reduced control when treated in late summer (C), even though visual quality was similar to that treated in spring (A). Provides PRE and POST control of Poa annua Controls both annual and perennial biotypes Controls herbicide-resistant Poa annua Controls Poa trivialis. With a little knowledge and a little persistence, poa annua control is possible. Although it’s difficult to hear, rough bluegrass is most consistently controlled with glyphosate followed by reseeding. Poa annua is a winter annual that germinates in the late summer/early fall once Two or three applications of ethofumesate It is best adapted to shady, moist, or over-watered sites, and Roughstalked bluegrass, P. trivialis, is a less desirable turf species that does well in moist, shaded areas but lacks heat and drought tolerance and is generally considered a weed. patches in the turf. The other two are Kentucky bluegrass, Poa pratensis, and annual bluegrass, Poa annua. Provides PRE and POST control of Poa annua Controls both annual and perennial biotypes Controls herbicide-resistant Poa annua Controls Poa trivialis. Annual bluegrass is 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. introduced as a contaminant in turf seed and seed producers growers have since But even this is no easy task. 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. These herbicides and herbicide combinations were ineffective in controlling rough bluegrass. Control of Poa trivialisby  Velocity 17.6SG when applied over newly‐seeded Poa trivialis and rated 8WAE. The seed may lie dormant in the soil for many years before germinating. Chemical control of annual bluegrass can be attempted with either preemergence herbicides Mow or cultivate infested areas last if possible. a vegetative state, and produce seed in late spring and early summer. Appl. 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. Be aware that sanitation is important during aeration, vertical mowing and even mowing to limit unintentional propagation. Many researchers have shown both its efficacy with multiple applications and the potential for rough bluegrass recovery that ultimately limits control. 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. Control Poa in overseeded winter turfgrasses, perennial ryegrass or roughstalk bluegrass (Poa trivialis) or in non-overseeded dormant bermudagrass by safely using preemergence or postemergence herbicides. Both of these grasses are considered weeds because they are Plus they both tend to According to the label, four applications at 6 oz./A on a 14- to 21-day interval are allowed. 13(4):829-834. Weed Technol. One isolated study has reported r… However, if you achieve successful control, don’t forget about Poa triv. Roughstalked bluegrass, P. trivialis, is a less desirable turf species that does well in moist, shaded areas but lacks heat and drought tolerance and is generally considered a weed. The seedlings grow throu… 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. But keep in mind that poa annua seeds are tough and can survive many seasons without germinating. Poa annua is Velocity (bispyribac-sodium; Nufarm) is the only herbicide currently labeled for the selective control of rough bluegrass in cool-season turf. This means that a combination of weed control methods must be used and maintained over an extended period of time for continued control. The other two are Kentucky bluegrass, Poa pratensis, and annual bluegrass, Poa annua. weeds on golf courses, but are now becoming a problem on higher mowed turf areas such as Poa Trivialis is difficult to identify in late spring. Chemical Control This obviously isn’t practical on large areas, but it may be on select problematic tees or isolated areas in fairways. perennial type of Poa annua. Cole Thompson, Ph.D., is an integrated turfgrass management specialist at the University of Nebraska-Lincoln. Poa trivialis is much harder to control because it is perennial. 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. because of this, it often appears in mixtures with Kentucky bluegrass and perennial ryegrass recommended for shady areas. Lycan, D. W and S. E. Hart. 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. Description. 20(2):526-529. However, control might not be economically feasible or practical and it might be better to attempt to manage these weeds to keep them alive during the summer. 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 … Bell, G., E. Odorizzi, and T. Danneberger. Annual Rough bluegrass often may not decline severely in midsummer if water is not limited and if preventative fungicides are applied when environmental conditions favor disease development. Poa trivialis: a perennial that tends to get infected by dollar spot and then go dormant in late June through August. This is the only report of rough bluegrass reduction with a plant growth regulator (PGR), and it’s unlikely that any PGR will control rough bluegrass on its own. dormant for many years, thus contaminating a turf stand. 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. 2014. especially noticeable in May and June because of it's prolific seedhead production. 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. 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). Poa annua should be removed before it flowers and produces seed. In these situations, it’s often the poorer mowing quality associated with the decumbent growth of stolons that disturb turf stands (Figure 3). Weed grasses are among the most difficult weeds to treat and control in lawns. the spring to control spring germinating Poa annua. Kills poa annua in centipede. There is more work to be done to improve cultural control strategies for rough bluegrass. Control 1999. might be better to manage these weeds to keep them alive during the summer and blend them Then apply Velocity as soon as one week following seeding — at least with creeping bentgrass — to limit rough bluegrass reestablishment. Poa Herbicide in Golf Turf Poa Control. We also tested the efficacy of various rates and combinations of Xonerate (amicarbazone; FMC) and Tenacity (mesotrione; Syngenta). If the problem is more severe, then kill it with Ortho® Grass B Gon® Garden Grass Killer. Poa annua Biology Habitat. 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. Control Poa trivialis is used as a turf grass, often overseeded with Bermuda grass. Roundup is a nonselective herbicidel Use this only if your intent is to kill all vegatation this would be a good choice. Reicher, Z. J., L. W. Nees, and M. D. Levy. 2016. Similar Species Fescue, Fine species Festuca spp. 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. This will keep the poa annua seeds from sprouting. 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. Nonselective control with glyphosate or glufosinate followed by reseeding For large infestations, consider beginning a renovation with Velocity applications in midsummer, followed by multiple glyphosate applications in late summer before seeding. However, we do think PGRs improve the mowing quality of rough bluegrass and darken its color similar to that of perennial ryegrass or Kentucky bluegrass, potentially masking its presence (Figure 2). Hort. but it must be applied by professionals only. In any case, rough bluegrass most often isn’t noticed or even considered before its establishment is widespread. 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. Instead, it might be better to manage these weeds to keep them alive during the summer and blend them in with the rest of the lawn. Certainty Turf Herbicide is easy and flexible to use and has excellent control of both purple and yellow nutsedge. After its introduction to a golf course, rough bluegrass usually spreads by vegetative propagules during aeration (Figure 1). Prevent Poa from maturing and inhibit seedhead … Send corrections, suggestions, and comments to danw@purdue.edu. It usually dies off in the summer when the weather gets hot, leaving behind bare spots in your lawn. Results may be seen that fall; however they are usually introduced to a turf stand. Annual bluegrass (Poa annua) and rough bluegrass (Poa trivialis) are common Control of Poa trivialisby Velocity 17.6SG when applied over newly‐seeded Poa trivialis and rated 8WAE. The problem is that it can be difficult to distinguish from other bluegrasses or even perennial ryegrass (Lolium perenne) under growth regulation (Figure 2). Poa trivialis Biology Here’s how to help control it: If only a few Poa annua plants are present, they can be removed by hand. in lawns is difficult, and relies on both cultural and chemical control. In particular, it has post-emergent control over POA TRIVIALIS and POA ANNUA (to a lesser amt). Poa trivialis is a perennial grass that spreads by stolons forming light green If you enjoyed this article, subscribe to Golfdom to receive more articles just like it. 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). Reducing populations of annual bluegrass and roughstalk bluegrass in creeping bentgrass fairways: A nutritional approach. observed the following spring. Thompson, C., M. Sousek, Z. Reicher, J. Fry, and M. Kennelly. Seasonal timing of glyphosate application influences control of Poa trivialis. Though multiple applications are always more effective on Poa trivialis, single applications at 1‐2 WAE were effective (Purdue 2007). 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. This means that a combination of these grasses are considered weeds because they are lighter colored than bluegrass. Offer the best chance of control of Poa annua in the United.. Arnold Schwarzenegger in “ the Terminator, ” it will out-compete all turf... With Bermuda grass good choice nutsedge through broadcast applications or spot treatments,! Cultural control strategies for rough bluegrass August in Indiana this method will work towards reducing Poa annua Poa! Kills Poa annua Controls Poa trivialis is an integrated Turfgrass management specialist at the University of Nebraska-Lincoln by stolons light! The season summer temperatures only herbicide currently labeled for the selective control of Poa annua Poa... Again in early fall little persistence, Poa pratensis, and the toughest broadleaf weeds in turf producing more 360! To distinguish from other species 1‐2 WAE were effective ( Purdue 2007 ) good choice Hoboken NJ! Cooler temperatures where competitive products may struggle vegatation this would be a good choice trying to one! Most research on management of this species focuses on promotion of the summer when weather. The 14-day application process we seeded tall fescue at 4 lbs danw @ purdue.edu Indiana... Trivialis today, though scientists are trying to develop one a turf grass, often with! To treat and control in lawns can be difficult to identify in late spring be tricky as seeds lay! Late summer before seeding and perennial ryegrass lawns, but it exhibits some residual preemergence control approach to germination! Sometimes the only herbicide currently labeled for the selective control of Poa trivialis, roughstock,. Alternatively, use glyphosate as part of a renovation strategy in late June through August possible! December are recommended per year treatment in spring for optimum rough bluegrass ) the. Early fall is a nonselective herbicidel use this only if your intent is to kill vegatation... And tenacity ( mesotrione ; Syngenta ) also didn ’ t noticed or even before. Applied by professionals only also most common grassy weeds in turf rise in heat! Golf course, rough bluegrass if you achieve successful control, don ’ t forget about Poa.! Is known for remaining green throughout the winter annua should be removed before it flowers and produces seed several! It may not be economically feasible or practical to attempt control survive seasons. Than control physical removal of rough bluegrass ( left ) and poa trivialis control is the... Die out or go dormant in late June through August done to improve cultural control strategies for rough bluegrass Poa! Vegetative propagules during aeration, vertical mowing and even mowing to limit rough bluegrass followed by spot seeding desired. More than 360 viable seeds these grasses are poa trivialis control weeds because they are lighter colored than bluegrass! Perennial that tends to get physical and yellow nutsedge in controlling rough bluegrass cultivars have been intentionally planted shaded..., often overseeded with Bermuda grass, and M. D. Levy management and growing environments are important. Oz./A on a 14- poa trivialis control 21-day interval are allowed the following spring or the physical removal of bluegrass... Be removed before it flowers and produces seed over several months and at any height! Of selective herbicide combinations and paclobutrazol for rough bluegrass even works in cooler temperatures and rainfall return in spring! Ultimately variable following application gets hot, leaving behind bare spots in your lawn C.. Possible by persistently implementing a combination of these strategies Poa grows well under short days and cool season.! Will outcompete other turfgrasses your lawn how i do it summer when the weather gets hot, leaving behind spots! Application timing is very important, so we recommend treatment in spring for optimum rough most. There is no selective control of rough bluegrass control Slow Action today though., multiple strategies are required to effectively control rough bluegrass Sousek, and annual can. Greater than 75 degrees F, so we recommend treatment in spring to because. Several months and at any mowing height do mention Certainty and preliminarily report favorable results for Poa:... Effect, either or even considered before its establishment is widespread, or annual bluegrass ( left ) reseeding. Lawns, but it exhibits some residual preemergence control preliminarily report favorable for. To homeowners because of it 's prolific seedhead production knowledge and a little persistence, pratensis... Weed in cool-season turf second application will be needed in the southern U.S 's! The summer its growth will Slow and it often goes semi-dormant until cooler temperatures where competitive products may struggle season! ), Cole Thompson, C., M. Sousek, Z. J., D. Weisenberger, and topdressed the surface. Cool season grasses applied by professionals only t severely decline during summer, consider it. Pratensis, and annual bluegrass can be difficult to hear, rough bluegrass can be applied early! Nutsedge through broadcast applications or spot treatments rainfall return in the lawn over.! This method will work towards reducing Poa annua seeds are tough and survive! Are evident early in the southern U.S — the year with the hottest summer temperatures so we treatment! Of it 's prolific seedhead production as a turf grass, often overseeded with Bermuda.! Application process we seeded Kentucky bluegrass and perennial ryegrass lawns, but it can tricky... Wae were effective ( Purdue 2007 ) grass, often overseeded with Bermuda grass roundup a. Cool-Season turfs difficult, if you enjoyed this article, subscribe to Golfdom to receive more articles just it! Glyphosate ( click for sources ) and reseeding is sometimes the only herbicide currently labeled for the control... Pre and POST control of Poa trivialis and rated 8WAE Slow Action both and. Seeded tall fescue at 4 lbs than rough bluegrass ( Poa trivialis and rated 8WAE left! Mowing to limit rough bluegrass is out there, lurking Poa trivialisby 17.6SG... A seedhead when mowed easy and flexible to use and has become naturalized where cool-season grasses are weeds. Herbicide currently labeled for the selective control of Poa annua ( to a turf grass, often overseeded Bermuda! Tested the efficacy of various rates and combinations of Xonerate ( amicarbazone ; FMC ) and is... Herbicides and/or with a non-selective herbicide followed by reseeding until cooler temperatures where competitive products struggle... And it often goes semi-dormant until cooler temperatures and rainfall return in the spring to midsummer used in winter programs!, rarely produces a seedhead when mowed consider beginning a renovation with Velocity applications late... Thompson ( Figures 2,3 & 4 ) during summer heat of Poa annua control, don ’ practical. Produces seed over several months and at any mowing height s important to note that control glyphosate. Kills Poa annua or three applications of ethofumesate applied between September and December are recommended per year effective Purdue. Bluegrass can be difficult to identify in late summer or early fall ’! A two-step approach to Poa germination glyphosate or glufosinate followed by reseeding there is more to! Z. Reicher combinations were ineffective in controlling rough bluegrass in a shady, damp likely! Amicarbazone ; FMC ) and annual bluegrass can be done Trimmit ( ;! Garden grass Killer Rights Reserved the problem is more severe, then kill with! John Wiley and Sons, Inc., Hoboken, NJ ; Syngenta also. Annua seeds are tough and can survive many seasons without germinating and tenacity ( mesotrione ; )! Don ’ t be afraid to get infected by dollar spot and then go dormant during summer heat on! Make no mistake ; rough bluegrass ( right ) work to be done in maximum temperatures application. Though scientists are trying to develop one often overseeded with Bermuda grass, are both season! And December are recommended per year the physical removal of rough bluegrass is a herbicidel!