Palmer Amaranth (<i>Amaranthus palmeri</i>) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike<sup>®</sup>Cotton

Barnett, Kelly A.; Culpepper, A. Stanley; York, Alan C.; Steckel, Lawrence E.

doi:10.1614/wt-d-12-00158.1

Cited by 24 publications

(33 citation statements)

References 39 publications

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“…For instance, Barnett et al (2013) reported >90% control of Palmer amaranth when glufosinate was applied to 13-cm-tall plants, but <60% control when glufosinate was applied to 26-cm-tall plants. In a bare-ground study in Illinois, Steckel et al (1997) reported >80% control of giant foxtail (Setaria faberi Herrm.…”

Section: Resultsmentioning

confidence: 99%

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

et al. 2017

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Glyphosate-resistant (GR) common waterhemp has become a significant problem weed in Nebraska and several Midwestern states. Several populations of GR common waterhemp are also resistant to acetolactate synthase (ALS)-inhibiting herbicides, making them difficult to control with POST herbicides in GR soybean. Glufosinate-resistant (GFR) soybean is an alternate system for controlling GR common waterhemp, justifying the need for evaluating glufosinate-based herbicide programs. The objectives of this study were to compare POST-only herbicide programs (including one-pass and two-pass POST programs) with PRE followed by (fb) POST herbicide programs for control of GR common waterhemp in GFR soybean and their effect on common waterhemp density, biomass, and soybean yield. Field experiments were conducted in 2013 and 2014 near Fremont, NE in a grower's field infested with GR common waterhemp. Glufosinate applied early-and late-POST provided 76% control of GR common waterhemp at 14 d after late-POST (DALPOST) compared with 93% control with a PRE fb POST program when averaged across treatments. The PRE application of chlorimuron plus thifensulfuron plus flumioxazin, S-metolachlor plus fomesafen or metribuzin, saflufenacil plus dimethenamid-P fb glufosinate provided ≥95% control of common waterhemp throughout the growing season, reduced common waterhemp density to ≤2.0 plants m, caused ≥94% biomass reduction, and led to 1,984 to 2,210 kg ha −1 soybean yield. Averaged across treatments, the PRE fb POST program provided 82% common waterhemp control at soybean harvest, reduced density to 23 plants m −2 at 14 DALPOST, and caused 86% biomass reduction and 1,803 kg ha −1 soybean yield compared with 77% control, 99 plants m −2 , 53% biomass reduction, and 1,190 kg ha −1 yield with POST-only program. It is concluded that PRE fb POST programs with multiple effective modes of action are available for control of GR common waterhemp in GFR soybean. Nomenclature: Acetochlor, alachlor, cloransulam, chlorimuron, dimethenamid, flumioxazin, fomesafen, glufosinate, glyphosate, imazethapyr, metribuzin, saflufenacil, S-metolachlor, sulfentrazone, thifensulfuron, common waterhemp, Amaranthus rudis Sauer, soybean, Glycine max (L.) Merr. Key words: Biomass reduction, POST-only program, PRE followed by POST, resistance management, soybean yield.Amaranthus rudis resistente a glyphosate (GR) se ha convertido en un problema de malezas significativo en Nebraska y en varios estados del Medio Oeste. Varias poblaciones de A. rudis GR también son resistentes a herbicidas inhibidores de acetolactate synthase, lo que las hace difíciles de controlar con herbicidas POST en soja GR. Soja resistente a glufosinate es un sistema alternativo para el control de A. rudis GR, lo que justifica la necesidad de evaluar programas de herbicidas basados en glufosinate. Los objetivos de este estudio fueron comparar programas con sólo herbicidas POST (incluyendo programas POST con uno y dos pases) con programas de herbicidas PRE seguidos por (fb) POST para el control de A. ru...

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Section: Resultsmentioning

confidence: 99%

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

et al. 2017

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“…Current options for POST control of Palmer amaranth in soybean include several protoporphyrinogen oxidase (PPO)-inhibiting herbicides and glufosinate in glufosinate-resistant (LibertyLinkt, Bayer CropScience) soybean (Scott et al 2014). Hectares planted to glufosinate-resistant soybean in the Midsouth are more numerous than in other areas of the United States partially as a result of the effectiveness of glufosinate on Palmer amaranth resistant to glyphosate and ALS-inhibiting herbicides (Barnett et al 2013;Norsworthy et al 2008a). However, for glufosinate to provide consistent, effective control of Palmer amaranth, it must be applied when the plants are small, generally 10 cm in height (Anonymous 2014a;Norsworthy et al 2012;Riar et al 2013).…”

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confidence: 99%

Effect of Row Spacing, Seeding Rate, and Herbicide Program in Glufosinate-Resistant Soybean on Palmer Amaranth Management

Bell

Norsworthy

Scott³

et al. 2015

Weed technol.

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A field experiment was conducted in Fayetteville, AR, in 2012 and 2013 to determine the influence of soybean row spacing, seeding rate, and herbicide program in glufosinate-resistant soybean on Palmer amaranth control, survival, and seed production; soybean groundcover and grain yield; and economic returns. Soybean groundcover was > 80% by 85 d after soybean planting (DAP) for all row spacing and seeding rates in 2012 and in 2013 all soybean row spacings and soybean seeding rates had achieved > 90% groundcover by 50 DAP. Difference in groundcover between years was due to lack of precipitation in 2012. Palmer amaranth control at 21 DAP was 99 to 100% for both years when a PRE application ofS-metolachlor plus metribuzin was made at planting. At 42 DAP, Palmer amaranth control following PRE-appliedS-metolachlor plus metribuzin was ≥ 98 and ≥ 88% in 2012 and 2013, respectively. When relying on a POST-only herbicide program initiated at 21 DAP, Palmer amaranth control ranged from 52 to 84% across row spacings at 42 DAP. At soybean harvest, Palmer amaranth control was ≥ 95% in 2012 and ≥ 86% in 2013 regardless of row spacing or seeding rate whenS-metolachlor plus metribuzin was applied at planting. Conversely, total-POST programs had no more than 50 and 85% Palmer amaranth control in 2012 and 2013, respectively. In both years, Palmer amaranth density and seed production at soybean harvest were generally lower in the PRE herbicide programs compared to POST-only programs. Use of a PRE herbicide at planting also improved soybean grain yield and economic returns over programs that relied on a POST-only program. Overall, the impacst of soybean row spacing and seeding rate on Palmer amaranth control, density, or seed production were less apparent than the influence of herbicide programs.

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“…At Mount Olive, Palmer amaranth fresh weight in plots receiving diuron preplant and no residual herbicide PRE was 4,570 kg ha À1 compared with 1,290 kg ha À1 or less in other treatments. All herbicide (Barnett et al 2013;Steckel et al 2012;Whitaker et al 2011a). Cotton in nontreated plots could not be harvested because of the severe Palmer amaranth infestations.…”

Section: Resultsmentioning

confidence: 99%

An Alternative to Multiple Protoporphyrinogen Oxidase Inhibitor Applications in No-Till Cotton

et al. 2014

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Glyphosate-resistant (GR) Palmer amaranth is a widespread problem in southeastern cotton production areas. Herbicide programs to control this weed in no-till cotton commonly include flumioxazin applied with preplant burndown herbicides approximately 3 wk before planting followed by fomesafen applied PRE and then glufosinate or glyphosate applied POST. Flumioxazin and fomesafen are both protoporphyrinogen oxidase (PPO) inhibitors. Multiple yearly applications of PPO inhibitors in cotton, along with widespread use of PPO inhibitors in rotational crops, raise concerns over possible selection for PPO resistance in Palmer amaranth. An experiment was conducted to determine the potential to substitute diuron for one of the PPO inhibitors in no-till cotton. Palmer amaranth control by diuron and fomesafen applied PRE varied by location, but fomesafen was generally more effective. Control by both herbicides was inadequate when timely rainfall was not received for activation. Palmer amaranth control was more consistent when programs included a preplant residual herbicide. Applied preplant, flumioxazin was more effective than diuron. Programs with diuron preplant followed by fomesafen PRE were as effective as flumioxazin preplant followed by fomesafen only if fomesafen was activated in a timely manner. Programs with flumioxazin preplant followed by diuron PRE were as effective as flumioxazin preplant followed by fomesafen PRE at all locations, regardless of timely activation of the PRE herbicide. As opposed to flumioxazin preplant followed by fomesafen PRE, which exposes Palmer amaranth to two PPO-inhibiting herbicides, one could reduce selection pressure by using flumioxazin preplant followed by diuron PRE without sacrificing Palmer amaranth control or cotton yield.

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Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike^®Cotton

Cited by 24 publications

References 39 publications

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

Effect of Row Spacing, Seeding Rate, and Herbicide Program in Glufosinate-Resistant Soybean on Palmer Amaranth Management

An Alternative to Multiple Protoporphyrinogen Oxidase Inhibitor Applications in No-Till Cotton

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Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike®Cotton

Cited by 24 publications

References 39 publications

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

Control of Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) in Glufosinate-Resistant Soybean

Effect of Row Spacing, Seeding Rate, and Herbicide Program in Glufosinate-Resistant Soybean on Palmer Amaranth Management

An Alternative to Multiple Protoporphyrinogen Oxidase Inhibitor Applications in No-Till Cotton

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Product

Resources

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Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike^®Cotton