Broadleaf Herbicide Effects on Clethodim and Quizalofop-P Efficacy on Volunteer Wheat (<i>Triticum aestivum</i>)

Blackshaw, Robert E.; Harker, K. Neil; Clayton, George W.; O’Donovan, John T.

doi:10.1614/wt-04-059r.1

Cited by 35 publications

(35 citation statements)

References 20 publications

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“…Overall, at the rates tested, quizalofop appears to have greater grass activity than either fenoxaprop or cyhalofop, which is similar to previous experiments which have often shown quizalofop to outperform other ACCase-inhibiting herbicides [24][25][26]. Moreover, quizalofop remained more effective on the grass weeds evaluated at larger growth stages (5-to 6-leaf, 12-to 16-leaf), whereas fenoxaprop and cyhalofop efficacy quickly diminished.…”

Section: Efficacy Of Quizalofop Compared To Registered Ricesupporting

confidence: 83%

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Lancaster

Norsworthy

Scott³

2018

International Journal of Agronomy

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Due to the ongoing evolution of herbicide-resistant weeds, new technologies are needed to maintain effective levels of control. A new rice variety that will be resistant to quizalofop, an acetyl coenzyme A carboxylase-(ACCase-) inhibiting herbicide, is currently under development. With the anticipated launch of this technology in 2018, multiple experiments were conducted to determine effectiveness of the quizalofop-resistant rice system for common grass weed species found in Arkansas rice production. One hundred and twenty-six barnyardgrass populations were collected across Arkansas and treated with quizalofop at 80 g ai hato determine a baseline of response. All populations evaluated were effectively controlled (≥92%) by quizalofop, with only 13 populations resulting in lower than 98% control. A greenhouse and field trial were conducted to compare efficacy of quizalofop to currently labeled rice graminicides for control of common rice grass weeds. Results from the greenhouse experiment showed that quizalofop treatments resulted in greater efficacy of common grass weeds compared to cyhalofop or fenoxaprop. This was especially apparent at the larger grass growth stages. A field experiment conducted compared season-long weed control programs of quizalofop to fenoxaprop and cyhalofop. The quizalofop-containing treatments were no better than fenoxaprop and cyhalofop for barnyardgrass and broadleaf signalgrass control. Barnyardgrass and broadleaf signalgrass control were greater than 96% for all herbicide treatments. An additional field experiment was conducted to determine the best rate structure for sequential applications of quizalofop in rice. Sequential applications of quizalofop at 120 g ha −1 followed by 120 g ha −1 two weeks later resulted in the highest barnyardgrass and broadleaf signalgrass control. Likewise, applying the full seasonal use rate of 240 g ha −1 of quizalofop resulted in greater control compared to 200 and 160 g ha −1 . Results from this research indicate a strong benefit from quizalofop use in rice.

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Section: Efficacy Of Quizalofop Compared To Registered Ricesupporting

confidence: 83%

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Lancaster

Norsworthy

Scott³

2018

International Journal of Agronomy

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“…Thell.] (Blackshaw, Harker, Clayton, & O'donovan, 2006). However, the interval between applications may help in avoiding negative interactions among herbicides.…”

Section: Resultsmentioning

confidence: 99%

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

et al. 2020

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Sourgrass (Digitaria insularis L.) and fleabane (Conyza spp. L.) constitute a major challenge to weed management in soybean [Glycine max (L.) Merr.] production systems in Brazil, especially when both are resistant to glyphosate and present concurrently. The aim of this study was to evaluate the interaction of haloxyfop-P-methyl [methyl(R)-2{4-{3-chloro-5(trifluoromethyl)-2-pyridyloxy] phenoxy} propanoate] and 2,4-D [2,4-Dichlorophenoxyacetic acid-N-methylmethanamine] to control sourgrass at three to four tillers and flowering stages and 12-to 15-cm fleabane at vegetative stage. The experiments were arranged in a randomized complete block design with four replicates and were conducted twice. Treatments were composed of haloxyfop-P-methyl and 2,4-D applied sequentially at 3-, 6-, and 12-d intervals.Treatments also included an untreated check, haloxyfop-P-methyl, and 2,4-D sequentially (without interval) and stand-alone applications of both herbicides. All treatments across experiments completely controlled fleabane plants, except haloxyfop-P-methyl alone. Haloxyfop-P-methyl applied ≥6 d before 2,4-D controlled flowering and three-to four-tiller sourgrass plants at rates of 50 and 100%, respectively. Based on results of this study, haloxyfop-P-methyl should be applied ≥6 d before 2,4-D in a sequential application structure to control fleabane and sourgrass (three or four tillers) when present concurrently.

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“…Matthiasen (17) noted that fenoxaprop rate had to be increased from 60 to 130% when applied in mixtures with mecoprop to achieve the level of wild oat ( Avena fatua L.) control observed with fenoxaprop alone. Blackshaw et al (6) noted 2,4‐D amine was highly antagonistic to clethodim and quizalofop applications to volunteer wheat ( Triticum aestivum L.). Antagonism has been noted when 2,4‐D was tank‐mixed with diclofop‐methyl and flamprop‐methyl for wild oat control (23,24,25).…”

Section: Introductionmentioning

confidence: 99%

Fluroxypyr Compatibility with Fenoxaprop for Smooth Crabgrass and White Clover Control in Tall Fescue

McCullough

Brosnan

Breeden

2009

Applied Turfgrass Science

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Fenoxaprop effectively controls crabgrass (Digitariaspp.) in tall fescue (Festuca arundinacea Schreb.) turf. Antagonism with growth‐regulating herbicides reduces potential to apply fenaxoprop in combination with many products for broadleaf weed control. Fluroxypyr is a pyridinoxy acid, broadleaf herbicide which may have potential for use in mixtures with fenoxaprop. Field experiments investigated fenoxaprop efficacy for smooth crabgrass (Digitaria ischaemum) control when applied alone and in combination with either fluroxypyr or a pre‐packaged mixture of 2,4‐D, dicamba, and mecoprop (MCPP) in tall fescue. Smooth crabgrass control from mixtures of fenoxaprop and fluroxypyr was similar to fenoxaprop alone. Smooth crabgrass control with mixtures of fenoxaprop with 2,4‐D, plus dicamba, plus MCPP was nearly 50% less than fenoxaprop alone. White clover was completely controlled from mixtures of fenoxaprop and fluroxypyr which was similar to fenoxaprop applied with 2,4‐D plus dicamba plus MCPP. Tall fescue injury was not detected on any rating date. Results suggest tank mixtures of fenoxaprop and fluroxypyr could provide effective control of smooth crabgrass and white clover in tall fescue.

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Broadleaf Herbicide Effects on Clethodim and Quizalofop-P Efficacy on Volunteer Wheat (Triticum aestivum)

Cited by 35 publications

References 20 publications

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

Fluroxypyr Compatibility with Fenoxaprop for Smooth Crabgrass and White Clover Control in Tall Fescue

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