Glyphosate-Resistant Weed Control and Soybean Injury in Response to Different PPO-Inhibiting Herbicides

Aulakh, Jatinder S.; Chahal, Parminder S.; Jhala, Amit J.

doi:10.5539/jas.v8n2p1

Cited by 7 publications

(9 citation statements)

References 38 publications

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“…In contrast, previous studies have reported 60% to 81% Palmer amaranth control with acifluorfen applied at a lower rate (280 g ha −1 ) than that used in this study, and 85% to 99% control with lactofen applied at rates similar to those tested in this study (220 g ha −1 ) (Gossett and Toler 1999;Jhala et al 2014;Sweat et al 1998). Aulakh et al (2016) further reported complete control of common waterhemp with acifluorfen and lactofen (420 and 220 g ha −1 , respectively) applied in a greenhouse study at rates similar to those tested here. Fomesafen, another PPO-inhibitor, controlled Palmer amaranth 69% and 72% at 7 and 21 DAT, respectively.…”

Section: Glyphosate-susceptiblecontrasting

confidence: 94%

Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Nebraska: Confirmation, EPSPS Gene Amplification, and Response to POST Corn and Soybean Herbicides

et al. 2017

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Palmer amaranth is the most problematic weed in agronomic crop production fields in the United States. A Palmer amaranth biotype was not controlled with sequential applications of glyphosate in glyphosateresistant (GR) soybean production field in south-central Nebraska. The seeds of the putative GR Palmer amaranth biotype were collected in the fall of 2015. The objectives of this study were to (1) confirm GR Palmer amaranth and determine the level of resistance in a whole-plant dose-response bioassay, (2) determine the copy number of 5-enolpyruvylshikimate-3-phosphate (EPSPS) gene, the molecular target of glyphosate, and (3) evaluate the response of GR Palmer amaranth biotype to POST corn and soybean herbicides with different modes-of-action. Based on the effective dose required to control 90% of plants (ED 90 ), the putative GR Palmer amaranth biotype was 37-to 40-fold resistant to glyphosate depending on the glyphosate-susceptible (GS) used as a baseline population. EPSPS gene amplification was present in the GR Palmer amaranth biotype with up to 32 to 105 EPSPS copies compared to the known GS biotypes. Response of GR Palmer amaranth to POST corn and soybean herbicides suggest reduced sensitivity to atrazine, hydroxyphenylpyruvate dioxygenase (HPPD)-(mesotrione, tembotrione, and topramezone), acetolactate synthase (ALS)-(halosulfuron-methyl), and protoporphyrinogen oxidase (PPO)-(carfentrazone and lactofen) inhibitors. GR Palmer amaranth was effectively controlled (>90%) with glufosinate applied at 593 g ai ha −1 with ≥95% reduction in biomass. More research is needed to determine whether this biotype exhibits multiple resistant to other group of herbicides and evaluate herbicide programs for effective management in corn and soybean. Nomenclature: 2,4-D; acetochlor; acifluorfen; atrazine; bentazon; bromoxynil; carfentrazone; chlorimuron; dicamba; fluthiacet; fomesafen; glufosinate; glyphosate; halosulfuron; imazamox; imazethapyr; lactofen; mesotrione; S-metolachlor; tembotrione; thiencarbazone; thifensulfuron; topramezone; Palmer amaranth, Amaranthus palmeri S. Wats.; corn, Zea mays L.; soybean, Glycine max (L.) Merr. Key words: EPSPS gene copy number, glyphosate-susceptible, herbicide efficacy, resistance confirmation, resistance management.Amaranthus palmeri es la malezas más problemática en campos de producción de cultivos agronómicos en los Estados Unidos. Un biotipo de A. palmeri no fue controlado con aplicaciones secuenciales de glyphosate en un campo de producción de soja resistente a glyphosate (GR) en el sur central de Nebraska. Las semillas del biotipo putativo GR de A. palmeri fueron colectadas en el otoño de 2015. Los objetivos de este estudio fueron (1) confirmar que A. palmeri es GR y determinar el nivel de resistencia en un bioensayo de respuesta a dosis con plantas completas, (2) determinar el número de copias del gen 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), el objetivo molecular de glyphosate, y (3) evaluar la respuesta del biotipo GR de A. palmeri a herbicidas POST para maíz y so...

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Section: Glyphosate-susceptiblecontrasting

confidence: 94%

Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Nebraska: Confirmation, EPSPS Gene Amplification, and Response to POST Corn and Soybean Herbicides

et al. 2017

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“…In contrast, few POST-applied herbicides (metolachlor + imazethapyr, metolachlor, and imazethapyr) caused 10 to 15% crop injury, while fomesafen and fomesafen + imazethapyr caused 15 to 25% crop injury at 10 DAPOST (data not shown). Other studies also reported 10 to 25% injury due to POST application of PPO-inhibitor herbicides (Aulakh et al, 2016;Sarangi et al, 2017).…”

Section: Soybean Yieldsmentioning

confidence: 93%

Weed Control in Soybean with Preemergence‐ and Postemergence‐applied Herbicides

Oliveira

Feist²,

Eskelsen³

et al. 2017

Crop Forage & Turfgrass Mgmt

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Core Ideas Herbicide premixes provided good (>90%) broadleaf and grass weed control in Nebraska. Preemergence‐applied herbicide premixes with different sites of action will help manage resistance weeds. Preemergence‐applied herbicides should be a foundation for weed management in soybean. In the past 20 years, weed control in soybean (Glycine max) was mainly based on postemergence (POST) applications of glyphosate, which resulted in glyphosate‐resistant weeds. Herbicide‐resistant weeds warrants evaluation of new strategies for effective control. Therefore, the objective of this study was to evaluate the performance of herbicides applied preemergence (PRE) and POST on 11 agronomic weeds in eastern Nebraska. The study was conducted in 2014 and 2015 in Concord, NE. The best PRE‐applied treatments were metolachlor + imazethapyr, fomesafen + imazethapyr, flumioxazin + imazethapyr, and flumioxazin + metribuzin, which controlled broadleaf and grass weed species ≥90 and ≥80%, respectively. However, weed control with POST herbicides was more variable, ranging from 19 to 91%. The POST‐applied fomesafen and fomesafen + imazethapyr controlled ivyleaf morningglory (Ipomoea hederacea), common lambsquarters (Chenopodium album), common waterhemp (Amaranthus tuberculatus), and redroot pigweed (Amaranthus retroflexus) ≥85%. Greater soybean yields were achieved with most PRE‐applied herbicides and POST‐applied fomesafen + imazethapyr only. Metolachlor + imazethapyr, metolachlor, and fomesafen applied PRE protected soybean yields better than when applied POST. Results suggested that PRE‐applied herbicide mixtures of different sites of action are the base for controlling weeds and protecting soybean yields in eastern Nebraska.

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“…Likewise, Palmer amaranth was controlled greater than 85% with lactofen applied at 220 g ai ha −1 (Jhala et al 2014;Sweat et al 1998). Aulakh et al (2016) observed complete control of waterhemp with lactofen applied at 220 g ai ha −1 .…”

Section: Response To Post Herbicidesmentioning

confidence: 73%

Multiple herbicide-resistant Palmer amaranth (Amaranthus palmeri) in Connecticut: confirmation and response to POST herbicides

Aulakh

Chahal²,

Kumar

et al. 2021

Weed Technol

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Palmer amaranth is the latest pigweed species documented in Connecticut in 2019. In a single dose experiment, the Connecticut Palmer amaranth biotype survived the field–use rates of glyphosate (840 g ae ha-1) and imazaquin (137 g ai ha-1) herbicides applied separately. Additional experiments were conducted to (1) determine the level of resistance to glyphosate and acetolactate synthase (ALS) inhibitors in the Connecticut–resistant (CT–Res) biotype using whole-plant dose-response bioassays, and (2) evaluate the response of the CT–Res biotype to POST herbicides commonly used in CT cropping systems. Based on the effective dose required for 90% control (ED90), the CT–Res biotype was 10–fold resistant to glyphosate when compared with the Kansas– susceptible (KS–Sus) biotype. Furthermore, the CT–Res biotype was highly resistant to ALS–inhibitor herbicides with only 18% control with 2,196 g ai ha-1 of imazaquin. It was also cross resistant to other ALS–inhibitor herbicides including: chlorimuron–ethyl (13.1 g ai ha-1), halosulfuron–methyl (70 g ai ha-1), and sulfometuron–methyl (392 g ai ha-1). The CT–Res Palmer amaranth was controlled 75 to 100% at 21 d after treatment (DAT) with POST applications of 2, 4–D (386 g ae ha-1), carfentrazone–ethyl (34 g ai ha-1), clopyralid (280 g ae ha-1), dicamba (280 g ae ha-1), glufosinate (595 g ai ha-1), lactofen (220 g ai ha-1), oxyfluorfen (1,121g ai ha-1), and mesotrione (105 g ai ha-1) herbicides. Atrazine (2,240 g ai ha-1) controlled the CT–Res biotype only 52%, suggesting the biotype is resistant to this herbicide as well. This research reports the first case of Palmer amaranth from Connecticut with multiple resistance to glyphosate and ALS–inhibitors. Growers should proactively use all available weed control tactics, including the use of effective PRE and alternative POST herbicides (tested in this study) for effective control of the CT–Res biotype.

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Glyphosate-Resistant Weed Control and Soybean Injury in Response to Different PPO-Inhibiting Herbicides

Cited by 7 publications

References 38 publications

Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Nebraska: Confirmation, EPSPS Gene Amplification, and Response to POST Corn and Soybean Herbicides

Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Nebraska: Confirmation, EPSPS Gene Amplification, and Response to POST Corn and Soybean Herbicides

Weed Control in Soybean with Preemergence‐ and Postemergence‐applied Herbicides

Multiple herbicide-resistant Palmer amaranth (Amaranthus palmeri) in Connecticut: confirmation and response to POST herbicides

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