Control of Johnsongrass in the Absence of Glyphosate in Midsouth Cotton Production Systems

Meyer, C.; Norsworthy, Jason K.; Stephenson, Daniel O.; Bararpour, Mohammad T.; Landry, Randall L.; Woolam, Brandi C.

doi:10.1614/wt-d-15-00057.1

Cited by 7 publications

(8 citation statements)

References 20 publications

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“…There was Johnsongrass regrowth from every herbicide application except from glyphosate (Figure 3). Therefore, all herbicide applications controlled only the above ground Johnsongrass biomass (shoot) and failed to control below ground As reported by Meyer et al (2015) effective management of severe infestations or escapes of 15-cm tall Johnsongrass was achieved by various herbicide combinations consisting mainly of glufosinate plus clethodim, as it has been observed in this study (Figure 4).…”

Section: Johnsongrass Controlsupporting

confidence: 70%

Evaluation of Herbicides for the Control of Yellow Nutsedge (Cyperus esculentus L.) and Johnsongrass (Sorghum halepense L.) Under Non-Crop Conditions

Bararpour¹,

Korres²,

Argenta³

et al. 2023

JAS

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Yellow nutsedge (Cyperus esculentus L.) and Johnsongrass (Sorghum halepense (L.) Pers.) are two of the most difficult weeds to control mostly due to their asexual reproduction. Yellow nutsedge reproduces through underground tubers and Johnsongrass through rhizomes. In addition, Johnsongrass is a problematic weed because of its competitive nature due to its C4 carbon fixation pathway metabolism. It typically grows to 1.8 to 2.5 m tall and can severely reduce yields in corn, cotton, soybeans, and other crops. Two separate field studies were conducted in 2020 at the Delta Research and Extension Center in Stoneville, Mississippi to evaluate the effectiveness of various herbicides on yellow nutsedge and Johnsongrass control in a non-crop scenario. The experiments were conducted as randomized complete block designs with 7 and 11 herbicide treatments for yellow nutsedge and Johnsongrass, respectively. All treatments were replicated three times. Research plots were 4-m wide and 6-m long with 3-m alleys between replications. The 7 yellow nutsedge herbicide treatments consisted of trifloxysulfuron, bentazon, halosulfuron, halosulfuron + thifensulfuron, glyphosate, glufosinate, and paraquat. The 11 Johnsongrass herbicide treatments included clethodim, quizalofop, fluazifop, cyhalofop, fenoxaprop, pinoxaden, glufosinate, glyphosate, clethodim + glyphosate, glufosinate + clethodim, and glufosinate + clethodim + glyphosate. Glyphosate and halosulfuron + thifensulfuron provided only 77 and 72% control of yellow nutsedge by five-weeks after application (WAA). On the other hand, glyphosate, clethodim + glyphosate, glufosinate + clethodim, and glufosinate + clethodim + glyphosate provided 99 to 100% Johnsongrass control 4 WAA. Johnsongrass regrowth evaluation was assessed 3-weeks after the experimental area was mowed. Johnsongrass regrew in every herbicide treatment except for glyphosate which was the only treatment that provided 100% Johnsongrass control with no-regrowth.

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Section: Johnsongrass Controlsupporting

confidence: 70%

Evaluation of Herbicides for the Control of Yellow Nutsedge (Cyperus esculentus L.) and Johnsongrass (Sorghum halepense L.) Under Non-Crop Conditions

Bararpour¹,

Korres²,

Argenta³

et al. 2023

JAS

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“…Johnsongrass is a perennial species that has historically been a highly problematic weed in row-crop production [28,29]. In the absence of glyphosate, Johnson et al [30] concluded that a single application of glufosinate alone is not sufficient to control Johnsongrass, and sequential applications of glufosinate plus clethodim were generally needed for acceptable control [31,32]. Weed spectrum and weather conditions may play a role in the recommendations of specific herbicide programs, and everything should be carried out to maximize the utility of the herbicides (i.e., glufosinate) utilized in those programs to achieve maximum weed control and mitigate the likelihood of resistance.…”

Section: Discussionmentioning

confidence: 99%

Timing and Application Rate for Sequential Applications of Glufosinate are Critical for Maximizing Control of Annual Weeds in LibertyLink® Soybean

Meyer

Norsworthy

2020

International Journal of Agronomy

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Preserving the utility of glufosinate in both LibertyLink soybean and other glufosinate-resistant crops is critical for managing herbicide-resistant weeds. An experiment with a two-factor factorial arrangement was conducted at the Arkansas Agricultural Research and Extension Center in Fayetteville, AR, in 2015, 2016, and 2017 to evaluate the efficacy of glufosinate in single and sequential applications at various rates on 8–32 cm tall Palmer amaranth, barnyardgrass, and broadleaf signalgrass. Herbicide treatments consisted of glufosinate applied at 454, 595, 738, and 882 g ai ha−1 (Factor 1) with either no sequential application or a sequential application occurring 7, 10, 14, or 21 days after the initial application (DAI) (Factor 2). For treatments that contained a sequential application, the same rate used in the initial application (e.g., 451 g ai ha−1) was also used in the sequential. Regardless of species and rate, sequential applications were always superior to single applications. Palmer amaranth control 3 weeks after the final treatment (WAF) was 8% greater when the sequential application occurred 10 DAI compared to 21 DAI, averaged over glufosinate rates. When at least 595 g ai ha−1 glufosinate was used in a treatment, no differences between the 7-, 10-, 14-, and 21-day sequential application intervals were observed for barnyardgrass or broadleaf signalgrass control, 3 WAF. Soybean yields were greater when the glufosinate applications occurred 7 or 10 d apart compared to 21 d, averaged over glufosinate rates. When large weeds are present in the field, these data suggest that glufosinate should be applied sequentially with a 7- to 14-day interval between applications. If sequential applications of glufosinate are used in combination with a comprehensive weed control management program, the value of the LibertyLink technology should be preserved by mitigating the risk of glufosinate resistance.

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“…The trials were initiated in fields that did not have a native population of johnsongrass, and the johnsongrass evaluated was easily identified as plants sown into rows using a planter. Single applications of glufosinate at ≥595 g ha -1 or clethodim at ≥136 g ha -1 provided >90% control of seedling johnsongrass in both experiments, whereas both Johnson et al (2014b) and Meyer et al (2015b) reported that two applications of glufosinate were needed to control rhizomatous johnsongrass.…”

Section: Weed Technologymentioning

confidence: 88%

“…Glufosinate will control a broad spectrum of grass and broadleaf weeds, and the utilization of various technologies with glufosinate-resistant traits will probably increase the use of glufosinate POST in the coming years. As a single application of glufosinate is not always enough to control emerged grasses (Culpepper et al 2000;Meyer et al 2015b), a detailed investigation on the performance of glufosinate in mixtures on common, hard-to-control grass weeds in the Midsouth United States is needed. Four common and troublesome grass weeds in this region are barnyardgrass, broadleaf signalgrass, large crabgrass, and johnsongrass (Webster 2012(Webster , 2013.…”

Section: Introductionmentioning

confidence: 99%

“…In a crop with a glufosinate-resistant trait, sequential applications of glufosinate, mixtures, or a PRE followed by a POST herbicide program, is needed to provide adequate control of johnsongrass (Johnson et al 2014a;Johnson and Norsworthy 2014;Meyer et al 2015b). Similarly, a PRE followed by POST application of glufosinate or sequential applications of glufosinate was needed to control broadleaf signalgrass in glufosinate-resistant soybean (Culpepper et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Antagonism in mixtures of glufosinate + glyphosate and glufosinate + clethodim on grasses

Meyer

Norsworthy²,

Kruger

2020

Weed Technol

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Proper management of glufosinate in glufosinate-resistant crop technologies is needed to mitigate the likelihood of resistance evolution. Antagonism may result from mixtures of glufosinate and other commonly used POST herbicides in soybean and cotton. Two experiments were conducted at the Arkansas Agricultural Research and Extension Center in Fayetteville, AR, in 2015 and 2016 to evaluate mixtures of glufosinate + clethodim and glufosinate + glyphosate on barnyardgrass, broadleaf signalgrass, johnsongrass, and large crabgrass. Furthermore, droplet spectra analyses were conducted to determine if droplet size was associated with identification of herbicide interactions. Antagonism was dependent on the herbicide rates and the weed species. For barnyardgrass and large crabgrass control 4 wk after treatment, glufosinate + glyphosate was antagonistic at all rates evaluated. When large crabgrass was evaluated, some mixtures (e.g., 595 g ha–1 glufosinate + 76 g ha–1 clethodim) had a significant reduction in control relative to one of the herbicides applied alone. Glufosinate (451 and 595 g ai ha–1) + glyphosate (867 and 1,735 g ae ha–1) was antagonistic at all four possible rate combinations for broadleaf signalgrass control. Fewer instances of antagonism were observed for seedling johnsongrass control than for other species, but certain treatments were identified as antagonistic (e.g., glufosinate at 451 g ai ha–1 + clethodim at 76 g ai ha–1). Overall, antagonism was less likely and greater control was observed when the highest rates of both herbicides in a given mixture were used. The addition of glyphosate or clethodim to glufosinate can increase the volume median diameter and decrease the percentage volume of fines, compared to glufosinate alone. The droplet spectra analyses indicate that the glufosinate performance may be negatively affected by the addition of glyphosate or clethodim.

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Control of Johnsongrass in the Absence of Glyphosate in Midsouth Cotton Production Systems

Cited by 7 publications

References 20 publications

Evaluation of Herbicides for the Control of Yellow Nutsedge (Cyperus esculentus L.) and Johnsongrass (Sorghum halepense L.) Under Non-Crop Conditions

Evaluation of Herbicides for the Control of Yellow Nutsedge (Cyperus esculentus L.) and Johnsongrass (Sorghum halepense L.) Under Non-Crop Conditions

Timing and Application Rate for Sequential Applications of Glufosinate are Critical for Maximizing Control of Annual Weeds in LibertyLink® Soybean

Antagonism in mixtures of glufosinate + glyphosate and glufosinate + clethodim on grasses

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