Response of Six Turfgrass Species and Four Weeds to Three HPPD‐Inhibiting Herbicides

Brewer, John R.; Willis, John B.; Rana, Sandeep; Askew, Shawn D.

doi:10.2134/agronj2016.06.0345

Cited by 15 publications

(26 citation statements)

References 24 publications

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“…y Regimen of mesotrione (140 g·ha -1 ) + amicarbazone (100 g·ha -1 ) followed by mesotrione only (140 g·ha -1 ) 2 weeks later. Brewer et al (2017) demonstrated that mesotrione causes more CBG injury than topramezone, CBG injury from topramezone + triclopyr tank mixtures was similar to mesotrione + triclopyr tank mixtures on all observation dates in 2014 and 2015.…”

Section: Resultsmentioning

confidence: 85%

“…Nonsignificant when a # 0.05. and 9 WAIT in 2016. The injury was likely caused by the triclopyr, as previous research by Brewer et al (2017) demonstrated that topramezone and mesotrione cause little to no kentucky bluegrass injury. Although we cannot make a direct statistical comparison between fall and spring experiments in our research, amicarbazone + mesotrione caused more kentucky bluegrass injury than in the spring than in the fall experiment.…”

Section: Nsmentioning

confidence: 79%

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Herbicide Regimens for Creeping Bentgrass Control in Kentucky Bluegrass

Elmore¹,

Murphy²,

Park³

2018

horts

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Creeping bentgrass (CBG; Agrostis stolonifera L.) is a problematic weed of coolseason turfgrass. The herbicide mesotrione is often used for selective control, but CBG often recovers from sequential applications. Research evaluated the efficacy of mesotrione-based sequential application regimens for CBG control in kentucky bluegrass (Poa pratensis L.) over a 2-year period. In two separate experiments, identical herbicide regimens were initiated in Oct. 2014 or May 2015 and then reapplied to the same plots in Oct. 2015 or May 2016, respectively. Regimens consisted of various sequential application regimens of mesotrione alone (totaling 560 g · ha -1 annually), three sequential applications of mesotrione (175 g · ha -1 ) tank-mixed with either triclopyr ester (560 or 1120 g · ha -1 ) or amicarbazone (50 or 100 g · ha -1 ), and topramezone (32 or 37 g · ha -1 ) tank-mixed with triclopyr ester (1120 g · ha -1 ). At the end of each 2-year experiment, the most effective treatments did not eliminate CBG completely. Among treatment regimens initiated in the fall, the most effective treatments reduced CBG cover 49% to 73% at the conclusion of the experiment in Oct. 2016. At the conclusion of the spring experiment in May 2017, the most effective treatments reduced CBG cover 66% to 94%. Topramezone + triclopyr tank mixtures were less effective than mesotrione-containing treatments on most dates. Mesotrione + amicarbazone tank mixtures reduced CBG more effectively than mesotrione alone, but these tank mixtures also caused severe kentucky bluegrass injury. CBG cover reductions from mesotrione + triclopyr tank mixtures and mesotrione alone were generally similar. Among mesotrione-only regimens, there were no consistent differences in CBG cover reduction. This research indicates that turf managers using a selective herbicide regimen to control CBG in kentucky bluegrass should apply mesotrione at the maximum annual use rate (560 g · ha -1 ) in two to four sequential applications at 2-to 3-week intervals.

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Section: Resultsmentioning

confidence: 85%

Section: Nsmentioning

confidence: 79%

Herbicide Regimens for Creeping Bentgrass Control in Kentucky Bluegrass

Elmore¹,

Murphy²,

Park³

2018

horts

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show abstract

“…In cases where transformation was needed, data were back-transformed for presentation clarity. A similar approach for determining data normality and homogeneity of variance to meet assumptions of ANOVA has also recently been used by other researchers (Brewer et al 2016; Rana and Askew 2016). All measured responses were subjected to a combined ANOVA using PROC GLM in SAS with the sum of squares partitioned to reflect the effects of the block, and also trial/location, herbicide program, and their interactions.…”

Section: Methodsmentioning

confidence: 99%

Long-Term Roughstalk Bluegrass Control in Creeping Bentgrass Fairways

Rana¹,

Askew

2017

Weed Technol

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Methiozolin is an isoxazoline herbicide that selectively controls annual bluegrass in cool-season turf and may control roughstalk bluegrass, another weedy Poa species that is problematic in many turfgrass systems. However, the majority of research to date is limited to evaluating methiozolin efficacy for annual bluegrass control in creeping bentgrass putting greens. Research was conducted comparing various application regimes of methiozolin and other herbicides for long-term roughstalk bluegrass control in creeping bentgrass golf fairways. Methiozolin-only treatments did not injure creeping bentgrass or reduce normalized difference vegetative index (NDVI) at 2 golf course locations based on 20 evaluation dates over a 2.5-yr period. The 2.5-yr average turf quality generally declined as roughstalk bluegrass control increased due to transient turf cover loss. At 1 yr after last treatment, methiozolin at 1500 g ai ha-1 applied four times in fall reduced roughstalk bluegrass cover 85%. This was equivalent to methiozolin at 1000 g ha-1 applied four times in fall, but greater than low rates of methiozolin applied four times in spring or twice in fall and spring. Amicarbazone, primisulfuron, and bispyribac-sodium alone either did not effectively reduce roughstalk bluegrass cover, or did so at the expense of increased creeping bentgrass injury. Results of this study suggest that methiozolin alone or tank-mixed with amicarbazone or primisulfuron is an effective long-term approach for selectively controlling roughstalk bluegrass in creeping bentgrass.

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“…Topramezone can control goosegrass, crabgrass, and dallisgrass at any growth stage (Anonymous 2018a). Topramezone is a hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor associated with whitening or bleaching symptoms on the newest tissue in sensitive plant species (Brewer et al 2017;Goddard et al 2010;Grossmann and Ehrhardt 2007). Topramezone was initially registered in 2013 for bermudagrass and goosegrass removal from cool-season turfgrasses (Anonymous 2018a).…”

Section: Introductionmentioning

confidence: 99%

Reducing topramezone injury to bermudagrass using chelated iron and other additives

et al. 2020

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Postemergence goosegrass and other grassy weed control in bermudagrass is problematic. Herbicides that can control goosegrass continue to decline due to regulatory pressure and herbicide resistance. Alternative herbicide options that offer effective control are needed. Previous research demonstrates that topramezone controls goosegrass, crabgrass, and other weed species; however, injury to bermudagrass may be unacceptable. The objective of this research was to evaluate safening potential of topramezone combinations with different additives on bermudagrass. Field trials were conducted at Auburn University during summer and fall from 2015 to 2018 and 2017 to 2018, respectively. Treatments included topramezone mixtures and methylated seed oil applied in combination with five different additives including triclopyr, green turf pigment, green turf paint, ammonium sulfate, and chelated iron. Bermudagrass bleaching and necrosis symptoms were visually rated. Normalized difference vegetative index measurements and clipping yield were also collected. Results showed that topramezone plus chelated iron, as well as topramezone plus triclopyr, reduced bleaching potential the best; however, the combination of topramezone plus triclopyr resulted in necrosis that outweighed reductions in bleaching. Masking agents such as green turf paint and green turf pigment were ineffective in reducing injury when applied with topramezone. The combination of topramezone plus ammonium sulfate should be avoided due to the high level of necrosis. Topramezone-associated bleaching symptoms were transient and lasted 7 to 14 days on average. Findings from this research suggest that chelated iron added to topramezone and MSO mixtures acted as a safener on bermudagrass.

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Response of Six Turfgrass Species and Four Weeds to Three HPPD‐Inhibiting Herbicides

Cited by 15 publications

References 24 publications

Herbicide Regimens for Creeping Bentgrass Control in Kentucky Bluegrass

Herbicide Regimens for Creeping Bentgrass Control in Kentucky Bluegrass

Long-Term Roughstalk Bluegrass Control in Creeping Bentgrass Fairways

Reducing topramezone injury to bermudagrass using chelated iron and other additives

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