Comparison of Herbicides for Control of Diclofop-Resistant Italian Ryegrass in Wheat

Bararpour, Taghi; Hale, Ralph R.; Kaur, Gurpreet; Bond, Jason A.; Burgos, Nilda R.; Tseng, Te‐Ming; Wilkerson, Tessie; Schwartz-Lazaro, Lauren M.

doi:10.3390/agriculture8090135

Cited by 4 publications

(6 citation statements)

References 18 publications

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“…Mesosulfuron EPOST fb mesosulfuron LPOST (T4) and metribuzin EPOST fb mesosulfuron LPOST (T5) showed GR Italian ryegrass control ranging between 65% to 97% which is similar to that reported by Bararpour, Korres, Burgos, Hale, and Tseng [19]. Ryegrass control by application of metribuzin EPOST fb metribuzin LPOST ranged between 79% to 94% [25]. Among all single and dual herbicide application programs T2 and T11 showed >87% control at 15WAT over two years of the study period.…”

Section: Glyphosate-resistant Italian Ryegrass Control Studysupporting

confidence: 84%

“…In Arkansas, Bararpour, Norsworthy, Burgos, Korres, and Gbur [3] reported populations of Italian ryegrass plants producing 20,000 to 45,000 seed plant −1 . Natural infestations of Italian ryegrass of Arkansas were ±323 plants m −2 ; furthermore, with interference due to densities of this magnitude wheat yield reductions were reported to be as high as 72% over 6 years [18].…”

Section: Of 10mentioning

confidence: 96%

“…The multi-mode of action and herbicide residual activity provided by T2 resulted in the highest GR Italian ryegrass control. Several studies have reported 84 to 96% Italian ryegrass control with flufenacet/metribuzin herbicides [16,19,20,[25][26][27][28]. Glyphosate-resistant Italian ryegrass control in 2017-2018 using mesosulfuron and pyroxasulfone ranged between 45% to 85% (Figure 2A-E).…”

Section: Glyphosate-resistant Italian Ryegrass Control Studymentioning

confidence: 97%

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Glyphosate-Resistant Italian Ryegrass (Lolium perenne L. spp. Multiflorum) Control and Seed Suppression in Mississippi

et al. 2020

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Italian ryegrass is a major weed problem in wheat (Triticum aestivum L.) production worldwide. Two separate studies were conducted in Stoneville, Mississippi to evaluate: (1) the efficacy of herbicides available to Mississippi producers for controlling glyphosate-resistant (GR) Italian ryegrass (control study), and (2) fall burndown herbicide seed suppression study. Results of the control study showed that flufenacet/metribuzin EPOST followed by (fb) pinoxaden LPOST (standard treatment) provided 93% control of GR Italian ryegrass. Some other treatments provided comparable Italian ryegrass control (92% to 97%) as the standard treatment in 2017. Italian ryegrass control in the seed suppression study was 100%, 100%, 67.5%, 97%, and 99.5% from the application of the following treatments: (1) S-metolachlor + flumioxazin + paraquat in October–November fb glyphosate + clethodim in January–February fb gramoxone as needed (weed-free check); (2) S-metolachlor + flumioxazin + paraquat in October–November; (3) field cultivator (disk) in October–November; (4) glyphosate + clethodim in January–February; and (5) field cultivator in October–November fb glyphosate + clethodim in January–February, respectively. The remaining Italian ryegrass from the application of treatments 3, 4, and 5 produced 65,700; 1008; and 9 seeds m−2, respectively. Seed suppression study highlights the importance of 100% control that is required to manage GR Italian grass.

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Section: Glyphosate-resistant Italian Ryegrass Control Studysupporting

confidence: 84%

Section: Of 10mentioning

confidence: 96%

Section: Glyphosate-resistant Italian Ryegrass Control Studymentioning

confidence: 97%

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Glyphosate-Resistant Italian Ryegrass (Lolium perenne L. spp. Multiflorum) Control and Seed Suppression in Mississippi

et al. 2020

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“…The taller accession is expected to dominate the competitive relationship through shading (Blair 2001) if its competitor, wheat for example, is shorter. Bararpour et al (2012) reported that the natural infestation of Italian ryegrass in Arkansas reduced wheat yield an average of 75%.…”

Section: Resultsmentioning

confidence: 99%

Identification and Biological Characteristics of Ryegrass (Loliumspp.) Accessions in Arkansas

et al. 2017

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Italian ryegrass is a major weed problem in wheat production worldwide. Field studies were conducted at Fayetteville, AR, to assess morphological characteristics of ryegrass accessions from Arkansas and differences among otherLoliumspp.: Italian, rigid, poison, and perennial ryegrass. Plant height, plant growth habit, plant stem color, and node color were recorded every 2 wk until maturity. The number of tillers per plant, spikes per plant, and seeds per plant were recorded at maturity. All ryegrass accessions from Arkansas were identified as Italian ryegrass, which had erect to prostrate growth habit, green to red stem color, green to red nodes, glume (10 mm) shorter than spikelet (19 mm), and medium seed size (5 to 7 mm) with 1 to 3 mm awns. However, significant variability in morphological characteristics was found among Arkansas ryegrass accessions. WhenLoliumspecies at the seedling stage (1- to 2-wk-old plants) were compared, poison ryegrass was characterized as having a large main-stem diameter and wide droopy leaves, whereas perennial ryegrass exhibited a short and a very narrow leaf blade. These two can be distinguished from Italian and rigid ryegrass, which have leaf blades wider than perennial ryegrass but narrower than poison ryegrass. Italian and rigid ryegrass are difficult to distinguish at the seedling stage but are distinct at the reproductive stage. At maturity, Italian ryegrass and poison ryegrass seeds are awned, but perennial and rigid ryegrass seeds are awnless. Poison ryegrass awns were at least 4-fold longer than Italian ryegrass awns. Perennial ryegrass flowered 3 wk later than the other species. Poison ryegrass glumes were longer than the spikelets, whereas Italian ryegrass glumes were shorter than the spikelets. Morphological traits indicate that some Italian ryegrass populations are potentially more competitive and more fecund than others.

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“…Reductions up to 61% in wheat grain yield were reported in the presence of Italian ryegrass (93 plants m −2 ) which caused reductions in wheat tillering capacity and promoted lodging [4]. In a six-year study, Bararpour and Oliver [5] reported a natural population of diclofop-resistant Italian ryegrass that caused 72% wheat yields reduction. Conventional and organic wheat production systems are affected by infestations of Italian ryegrass and with the increase in resistance to herbicide modes of action and increased market for organic grain, alternative methods of control should be evaluated [3].…”

Section: Introductionmentioning

confidence: 99%

Performance of Pinoxaden on the Control of Diclofop-Resistant Italian Ryegrass (Lolium perenne L. ssp. multiflorum) in Winter Wheat

Bararpour

Korres²,

Burgos³

et al. 2018

Agriculture

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Resistance to herbicides in Italian ryegrass (Lolium perenne L. ssp. multiflorum (Lam.) Husnot) is an economically important herbicide-resistance issue in world agriculture. Diclofop-resistant ryegrass is the number one weed problem in Arkansas wheat. Field studies were conducted from 2006 through 2008 at Bredlow corner and Fayetteville, Arkansas, USA to determine the effect of herbicide programs consisting of pinoxaden (Axial) alone or in mixtures with preemergence and postemergence herbicides, along with tillage systems, for managing diclofop-resistant Italian ryegrass. Italian ryegrass control, wheat injury, and grain yield were evaluated. A single treatment with pinoxaden alone resulted in 58% ryegrass control and 1488 kg ha −1 grain yield. The best treatment was metribuzin followed by mesosulfuron, which resulted in 2793 kg grain yield ha −1 , a 47% increase compared to pinoxaden alone. In Fayetteville (2006-2007 and 2007-2008), the best treatment was two applications of metribuzin, which yielded about 3700 kg grain ha −1. A single application of pinoxaden resulted in 40% loss of grain yield compared to a single application of flufenacet + metribuzin and almost 50% yield loss compared to sequential application of metribuzin. Yield loss was attributed due to insufficient control of Italian ryegrass. The effect of tillage on Italian ryegrass was inconsistent between years and treatments. In the first year, for example, tillage × herbicide treatments did not differ. In the second and third year, control of Italian ryegrass was better in no-till than in conventional till in both locations. In conclusion, pinoxaden alone could not control diclofop-resistant Italian ryegrass sufficiently. Other herbicide modes of action need to be added to the management program of diclofop-resistant Italian ryegrass, especially one with residual activity such as metribuzin.

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Comparison of Herbicides for Control of Diclofop-Resistant Italian Ryegrass in Wheat

Cited by 4 publications

References 18 publications

Glyphosate-Resistant Italian Ryegrass (Lolium perenne L. spp. Multiflorum) Control and Seed Suppression in Mississippi

Glyphosate-Resistant Italian Ryegrass (Lolium perenne L. spp. Multiflorum) Control and Seed Suppression in Mississippi

Identification and Biological Characteristics of Ryegrass (Loliumspp.) Accessions in Arkansas

Performance of Pinoxaden on the Control of Diclofop-Resistant Italian Ryegrass (Lolium perenne L. ssp. multiflorum) in Winter Wheat

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