Postemergence Control of Annual Bluegrass with Mesotrione in Kentucky Bluegrass

Skelton, Joshua J.; Sharp, William C.; Branham, B. E.

doi:10.21273/hortsci.47.4.522

Cited by 13 publications

(29 citation statements)

References 32 publications

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“…Kentucky bluegrass has superior tolerance to mesotrione compared to annual bluegrass, and treatments did not inhibit tillering from the nontreated at any growth stage. These results support previous observations on the differential tolerance levels of annual bluegrass to mesotrione at various stages of maturity in field experiments (Reicher et al 2011;Skelton et al 2012). POST applications of mesotrione at 140 and 210 g ha À1 applied 4 wk after emergence did not reduce Kentucky bluegrass cover from the nontreated (Venner 2011).…”

Section: Resultssupporting

confidence: 90%

Growth Stage Influences Mesotrione Efficacy and Fate in Two Bluegrass (Poa) Species

McCullough

2016

Weed technol.

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Mesotrione provides PRE and early POST control of annual bluegrass during Kentucky bluegrass establishment from seed, but applications do not effectively control multitiller plants. The physiological effects of growth stage on efficacy and the basis of mesotrione selectivity between species is not well understood. The objectives of this research were to evaluate mesotrione behavior in these species at three growth stages: pretiller (3 to 5 leaves), 1-tiller, and multitiller (5 to 7 tillers). In greenhouse experiments, a single mesotrione application at 280 g ai ha−1injured pretiller, 1-tiller, and multitiller annual bluegrass 54, 33, and 11% at 4 wk after initial treatment (WAIT), respectively. A sequential application of mesotrione increased injury to pretiller and 1-tiller annual bluegrass by 20 and 17% from a single treatment, respectively. Sequential mesotrione applications caused at least 14% injury to multitiller annual bluegrass and Kentucky bluegrass at all growth stages and did not reduce tillering compared to the nontreated. Annual bluegrass absorbed 34% more root-applied14C-mesotrione than Kentucky bluegrass in hydroponic culture, but relative differences (Bq g−1) among growth stages were not detected for both species. Averaged across growth stages, annual and Kentucky bluegrass absorbed 31 and 35% of the applied radioactivity after foliar treatments, respectively. However, averaged across species, multitiller plants metabolized approximately two times more14C-mesotrione than pretiller and 1-tiller plants. Overall, the selectivity of mesotrione for annual bluegrass control during Kentucky bluegrass establishment results from differential levels of root absorption. Mesotrione has limited efficacy for controlling multitiller annual bluegrass due to enhanced degradation compared to pretiller and 1-tiller plants.

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Section: Resultssupporting

confidence: 90%

Growth Stage Influences Mesotrione Efficacy and Fate in Two Bluegrass (Poa) Species

McCullough

2016

Weed technol.

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“…However, ABG control with these herbicides is often poor or inconsistent (Reicher et al, 2011). Mesotrione is registered for preemergence ABG suppression (Anonymous, 2011); research evaluating postemergence efficacy demonstrates that while sequential applications can provide ABG control, efficacy is often inconsistent across experiments (Patton et al, 2011; Reicher et al, 2011; Skelton et al, 2012; Reicher et al, 2017). Ethofumesate is registered for ABG control in cool‐season turfgrass and provides more consistent ABG control than mesotrione in cool‐season turf as well as bermudagrass ( Cynodon dactylon [L] Pers.)…”

Section: Useful Conversionsmentioning

confidence: 99%

“…Ethofumesate was applied approximately 3 weeks after PRYE seeding on 4 Oct. 2015 and 7 Oct. 2016; sequential applications were made at approximately 4 weeks (3 Nov. 2015 and 4 Nov. 2016) and 8 weeks (4 Dec. 2015 and 2 Dec. 2016) after initial applications. Mesotrione treatments for preemergence and postemergence ABG control were developed based on previous work demonstrating that repeat applications of mesotrione can provide ABG control (Baldwin and Brede, 2010; Branham et al, 2010; Reicher et al, 2011; Patton et al, 2011; Skelton et al, 2012). Mesotrione + amicarbazone treatments were intended to provide postemergence control of ABG prior to PYRE seeding (Branham, 2012; Elmore et al, 2013a); subsequent mesotrione applications were meant to provide preemergence and postemergence suppression of ABG after PRYE seeding.…”

Section: Description and Application Of Herbicide Programsmentioning

confidence: 99%

Using Herbicides and Perennial Ryegrass to Renovate Turf Dominated by Annual Bluegrass

Park

Elmore

Murphy

2019

Crop, Forage & Turfgrass Management

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Glyphosate applied prior to perennial ryegrass (PRYE) seeding did not affect PRYE cover compared to seeding alone (nontreated).• Post-seeding herbicide regimens are necessary to maximize PYRE establishment where a significant annual bluegrass (ABG) soil seedbank exists.• Autumn applications of ethofumesate resulted in the greatest PRYE cover and ABG control by the following spring.• Mesotrione-based herbicide programs applied during autumn provided ABG control. There was no advantage of applying mesotrione + amicarbazone for postemergence ABG control prior to PRYE seeding. ABSTRACTAnnual bluegrass (ABG; Poa annua L.) is among the most problematic weeds in golf and sports turfs. Perennial ryegrass (PRYE; Lolium perenne L.) can be more effectively seeded into existing turfs compared with other cool-season turfgrasses due to its quick germination and seedling vigor. Herbicide programs are often used to suppress ABG encroachment into newly renovated turfs. The objective of this study was to assess the effectiveness of herbicide programs designed to suppress ABG in turf seeded with PRYE. Trials were initiated during September 2015 and 2016 on a mature stand of ABG in North Brunswick, NJ. Treatments consisted of 13 herbicide programs and a nontreated check. Programs involved applications of glyphosate, ethofumesate, mesotrione, and amicarbazone applied during September through December 2015 and 2016. Separate trial areas were core cultivated with soil reincorporated; 'Manhattan 5 GLR' PRYE was slit-seeded on 14 Sep. 2015 and 16 Sep. 2016. Glyphosate followed by (fb) seeding did not affect PRYE establishment compared to seeding alone (nontreated). Three autumn applications of ethofumesate resulted in the greatest PRYE cover and best ABG control by the following spring in both years. All mesotrione herbicide programs suppressed ABG encroachment. Applications of mesotrione + amicarbazone prior to PRYE seeding did not affect PRYE establishment compared to most mesotrione-only herbicide programs.

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“…Our data reinforce that mesotrione has potential for controlling ABG in the northern Great Plains of the United States. We likely could have improved efficacy of POST applications of mesotrione with more frequent applications at lower rates (Skelton et al, 2012) or by increasing the amount of N applied with or shortly after application (Elmore et al, 2013). Mesotrione applied PRE had little effect on ABG, as mesotrione applied once as a PRE in August was the only treatment that did not affect ABG cover at any time during the study (Table 1).…”

Section: Controlling Annual Bluegrass In Kentucky Bluegrass Fairwaysmentioning

confidence: 99%

Herbicide Programs for Annual Bluegrass (Poa annua L.) Control in Nebraska

Reicher

Sousek

Giese

2017

Crop Forage & Turfgrass Mgmt

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Core Ideas Research done on annual bluegrass (ABG) control in other areas of the US are likely applicable to Nebraska. However, extreme weather can dramatically affect short‐term annual bluegrass cover and emphasize the need for long‐term control studies. Three fall POST applications of mesotrione plus prodiamine applied preemergence in August and/or November were effective for ABG control in Kentucky bluegrass fairways. Replacing mesotrione with ethofumesate was also effective when combined with prodiamine in August and November. June applications of bispyribac‐sodium at 4 oz/ac was highly effective for controlling ABG in creeping bentgrass fairways, and adding two more fall applications at the same rate improved control slightly, but there was no benefit to raising the rate to 6 oz/ac. Annual bluegrass (Poa annua L.) (ABG) is common in golf courses, and its control has been thoroughly researched in cool‐season turf east of the Mississippi River in the United States. However, ABG response to herbicides varies widely among environments and/or biotypes, and little ABG control research has been done in the northern Great Plains. Therefore, our objective was to validate ABG herbicide control systems in golf course fairways of Kentucky bluegrass (Poa pratensis L.) (KBG) or creeping bentgrass (Agrostis stolonifera L.) (CBG) in Nebraska. Preemergence (PRE) treatments of prodiamine or mesotrione were applied in late summer over 3 yr with or without fall postemergence (POST) treatments of mesotrione or ethofumesate for ABG control in a low‐mow KBG fairway. We also evaluated rate and frequency of bispyribac‐sodium applications with or without a late summer–applied PRE (dithiopyr) in early September for ABG control over 3 yr in a CBG fairway. Our research indicates that ABG control work done in other areas are likely applicable to Nebraska. Three fall POST applications of mesotrione plus prodiamine applied as a PRE in August and/or November was effective for ABG control in KBG fairways. Replacing mesotrione with ethofumesate was also effective when combined with prodiamine in August and November. June applications of bispyribac‐sodium at 4 oz/ac were highly effective for controlling ABG in CBG fairways, and adding two more fall applications at the same rate improved control slightly, but there was no benefit to raising the rate to 6 oz/ac. Lastly, extreme weather in one summer and one winter dramatically affected short‐term ABG cover and emphasized the need for long‐term control studies in areas with dramatic weather cycles.

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Postemergence Control of Annual Bluegrass with Mesotrione in Kentucky Bluegrass

Cited by 13 publications

References 32 publications

Growth Stage Influences Mesotrione Efficacy and Fate in Two Bluegrass (Poa) Species

Growth Stage Influences Mesotrione Efficacy and Fate in Two Bluegrass (Poa) Species

Using Herbicides and Perennial Ryegrass to Renovate Turf Dominated by Annual Bluegrass

Herbicide Programs for Annual Bluegrass (Poa annua L.) Control in Nebraska

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