Common Bermudagrass Seedhead Suppression and Growth Regulation with Fenoxaprop

Brosnan, James T.; Breeden, Gregory K.; Armel, Gregory R.; Vargas, José J.

doi:10.1614/wt-d-10-00123.1

Cited by 4 publications

(13 citation statements)

References 32 publications

(56 reference statements)

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“…At 1 WAT (data not shown), less than 10% chlorosis was observed in all treatments and no differences were detected. This trend of minimal injury within 7 d of application is consistent with other studies (Brecke et al 2010;Brosnan et al 2011). At 2 WAT, there was an increase in chlorosis for all treatments (Table 3).…”

Section: Resultssupporting

confidence: 91%

Evaluation of Aminocyclopyrachlor Herbicide for Turf Tolerance and Weed Control on Florida Roadside Right-of-Ways

et al. 2016

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Aminocyclopyrachlor (AMCP) is a pyrimidine carboxylic acid herbicide that is being evaluated for weed control on highway right-of-ways. The goal of this study was to evaluate weed control capabilities and tolerance of desirable turf to AMCP. The objective of the weed efficacy trial was to determine if AMCP (66, 132, and 263 g ai ha−1) was as effective as aminopyralid (18, 53, and 88 g ai ha−1) for controlling two weed species, mat lippia andBidens alba. In 2011, AMCP applied at 132 g ai ha−1resulted in 93% control of mat lippia at 2 mo after treatment (MAT) and 65% control at 3 MAT. In 2012, AMCP at 66 or 132 g ha−1resulted in 93 to 97% control of mat lippia, respectively, at 3 MAT. Aminopyralid, applied POST, never exceed 10% control of mat lippia in 2011 and 60% control in 2012. AMCP, applied POST, at 66 g ha−1, controlled ofB. alba84%, similar to the 89% control seen with aminopyralid at 88 g ha−1. The level of control from AMCP of the two weed species was equal to or greater than aminopyralid. An additional objective was to determine the tolerance of common bermudagrass and ‘Pensacola' bahiagrass to AMCP (66, 132, and 263 g ai ha−1) and imazapic (35 and 70 g ai ha−1) applied alone and in combination. Applications were made in late spring during seedhead initiation. No additional chlorosis was detected when imazapic was applied in combination with AMCP for either turf species. Averaged across imazapic rates, AMCP at 66 and 132 g ha−1, within the suggested rate range (48.5–132 g ai ha−1), did not cause greater than 25% chlorosis at any time. Chlorosis observed for AMCP applied alone and in combination with imazapic was acceptable and decreased to zero by 8 to 10 wk after treatment.

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Section: Resultssupporting

confidence: 91%

Evaluation of Aminocyclopyrachlor Herbicide for Turf Tolerance and Weed Control on Florida Roadside Right-of-Ways

et al. 2016

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“…Fewer than 5 seedheads m À2 were present when treatments were initially applied on April 9, 2010, and March 29, 2011. Mowing ceased after treatment application to facilitate visual assessments of seedhead suppression similar to previous experiments (Brosnan et al 2011;McCullough et al 2011).…”

Section: Methodsmentioning

confidence: 99%

“…Sublethal rates of herbicides have also been used to suppress seedhead production of desirable turfgrasses. Brosnan et al (2011) reported that imazapic at 52 g ai ha À1 suppressed 'Riviera' bermudagrass [Cynodon dactylon (L.) Pers.] seedhead production 80 to 96%.…”

mentioning

confidence: 99%

“…Temporary turfgrass discoloration and injury have been reported following imazapic applications for bahiagrass, bermudagrass, and tall fescue seedhead suppression (Baker et al 1999;Brosnan et al 2011;Goatley et al 1993Goatley et al , 1996Goatley et al , 1998Hixson et al 2007;Yelverton et al 1997). However, turf quality can be improved following imazapic treatment.…”

mentioning

confidence: 99%

“…However, turf quality can be improved following imazapic treatment. Brosnan et al (2011) used relative-chlorophyll index data to illustrate that bermudagrass, injured with imazapic at 52 g ha À1 , had increased (i.e., was darker) green color, compared with nontreated bermudagrass, by 35 DAT. Increases in bermudagrass green color with imazapic were similar to those caused by trinexapac-ethyl, a commonly used growth regulator known to increase bermudagrass color (Brosnan et al 2010).…”

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confidence: 99%

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Zoysiagrass Seedhead Suppression with Imidazolinone Herbicides

Brosnan

Breeden²,

Elmore³

et al. 2012

Weed technol.

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Options for suppressing zoysiagrass seedheads in managed turfgrass systems are limited. Experiments were conducted in 2010 and 2011 evaluating the use of imazamox (26, 52, and 70 g ai ha−1) or imazapic (52 g ai ha−1) for ‘Zenith' and ‘Meyer' zoysiagrass seedhead suppression. Imazamox and imazapic at ≥ 52 g ai ha−1 suppressed Zenith zoysiagrass seedheads ≥ 95% at 2 to 6 wk after initial treatment (WAIT) each year. Slight injury (< 10%) was observed with these treatments; however, effective seedhead suppression resulted in increased (i.e., darker) green color from 8 to 15 WAIT each year. Relative chlorophyll index values for imazamox- and imazapic-treated plots ranged from 100 to 147% of the nontreated control in 2010 and 89 to 125% of the nontreated in 2011. On Meyer zoysiagrass, imazamox and imazapic at ≥ 52 g ha−1 reduced seedhead counts greater than 90% in both Tennessee and Indiana. However, significant (> 25%) injury was reported with these treatments at one experimental location. Although imazamox and imazapic have efficacy for zoysiagrass seedhead suppression, additional studies are needed to determine factors affecting zoysiagrass injury potential from imazamox and imazapic applications.

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Growth Suppression of Hybrid Bermudagrass with Imazapic

Pritchard,

Carroll,

Carr

et al. 2024

horts

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Imazapic is an acetolactate synthase-inhibiting herbicide labeled for weed control in pastures, rangeland, and noncrop areas. Field research was conducted in Knoxville, TN, USA, during 2020 and 2021 to evaluate the tolerance of four hybrid bermudagrass (Cynodon dactylon × Cynodon transvaalensis Burtt Davy) cultivars to applications of imazapic for growth suppression. Separate experiments were conducted on ‘TifTuf’, ‘Tifway’, ‘Tahoma 31’, and ‘Latitude 36’ hybrid bermudagrass. Experiments included plots (1.5 m2) arranged in a randomized complete block design with four replications and were repeated. Treatments were applied 14 Aug 2020 and 6 Aug 2021, and were mixed with methylated seed oil. Imazapic rates were 0, 35, 52.5, 70, or 105 g⋅ha–1. Cultivar tolerance was assessed via visual ratings of turfgrass injury relative to untreated check plots. Normalized differential vegetation index data were collected on each date turfgrass injury was evaluated. Growth suppression was quantified via reductions in dry clipping weight after mowing. Hybrid bermudagrass injury increased with imazapic rate for all cultivars, and peak injury (> 30%) following all imazapic treatments occurred within 14 days. At the lowest imazapic rate (35 g⋅ha–1), injury was transient, with all hybrid bermudagrass cultivars fully recovered by 28 days. All rates of imazapic reduced hybrid bermudagrass dry clipping weight for 21 days for all cultivars. Further research is warranted to explore lower application rates than those tested in our study, in addition to determining tolerance and growth suppression of other turfgrass species commonly managed on golf courses.

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Common Bermudagrass Seedhead Suppression and Growth Regulation with Fenoxaprop

Cited by 4 publications

References 32 publications

Evaluation of Aminocyclopyrachlor Herbicide for Turf Tolerance and Weed Control on Florida Roadside Right-of-Ways

Evaluation of Aminocyclopyrachlor Herbicide for Turf Tolerance and Weed Control on Florida Roadside Right-of-Ways

Zoysiagrass Seedhead Suppression with Imidazolinone Herbicides

Growth Suppression of Hybrid Bermudagrass with Imazapic

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