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Effective two-pass herbicide programs to control glyphosate-resistant Palmer amaranth (Amaranthus palmeri) in glyphosate/dicamba-resistant soybean

Published online by Cambridge University Press:  18 August 2020

Vipan Kumar Open the ORCID record for Vipan Kumar [Opens in a new window] ,
Rui Liu ,
Dallas E. Peterson  and
Phillip W. Stahlman
Vipan Kumar*
Affiliation:
Assistant Professor, Kansas State University, Agricultural Research Center, Hays, KS, USA
Rui Liu
Affiliation:
Assistant Scientist, Kansas State University, Agricultural Research Center, Hays, KS, USA
Dallas E. Peterson
Affiliation:
Emeritus Professor, Kansas State University, Department of Agronomy, Manhattan, KS, USA
Phillip W. Stahlman
Affiliation:
Emeritus Professor, Kansas State University, Agricultural Research Center, Hays, KS, USA
*
Author for correspondence: Vipan Kumar, Kansas State University, Agricultural Research Center, 1232 240th Avenue, Hays, KS67601. (Email: vkumar@ksu.edu)
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Abstract

Field experiments were conducted in 2018 and 2019 at Kansas State University Ashland Bottoms (KSU-AB) research farm near Manhattan, KS, and Kansas State University Agricultural Research Center (KSU-ARC) near Hays, KS, to determine the effectiveness of various PRE-applied herbicide premixes and tank mixtures alone or followed by (fb) an early POST (EPOST) treatment of glyphosate + dicamba for controlling glyphosate-resistant (GR) Palmer amaranth in glyphosate/dicamba-resistant (GDR) soybean. In experiment 1, PRE-applied sulfentrazone + S-metolachlor, saflufenacil + imazethapyr + pyroxasulfone, chlorimuron + flumioxazin + pyroxasulfone, and metribuzin + flumioxazin + imazethapyr provided 85% to 94% end-of-season control of GR Palmer amaranth across both sites. In comparison, Palmer amaranth control ranged from 63% to 87% at final evaluation with PRE-applied pyroxasulfone + sulfentrazone, pyroxasulfone + sulfentrazone plus metribuzin, pyroxasulfone + sulfentrazone plus carfentrazone + sulfentrazone, and sulfentrazone + metribuzin at the KSU-ARC site in experiment 2. All PRE fb EPOST (i.e., two-pass) programs provided near-complete (98% to 100%) control of GR Palmer amaranth at both sites. PRE-alone programs reduced Palmer amaranth shoot biomass by 35% to 76% in experiment 1 at both sites, whereas all two-pass programs prevented Palmer amaranth biomass production. No differences in soybean yields were observed among tested programs in experiment 1 at KSU-ARC site; however, PRE-alone sulfentrazone + S-metolachlor, saflufenacil + imazethapyr + pyroxasulfone, and chlorimuron + flumioxazin + pyroxasulfone had lower grain yield (average, 4,342 kg ha−1) compared with the top yielding (4,832 kg ha−1) treatment at the KSU-AB site. PRE-applied sulfentrazone + metribuzin had a lower soybean yield (1,776 kg ha−1) compared with all other programs in experiment 2 at the KSU-ARC site. These results suggest growers should proactively adopt effective PRE-applied premixes fb EPOST programs evaluated in this study to reduce selection pressure from multiple POST dicamba applications for GR Palmer amaranth control in GDR soybean.

Keywords

Glyphosate resistanceglyphosate/dicamba-resistant soybeanselection pressuresoil-residual premixesCarfentrazone-ethylchlorimurondicambaflumioxazinglyphosateimazethapyrmetribuzinpyroxasulfoneS-metolachlorsulfentrazonePalmer amaranthAmaranthus palmeri S. WatsonsoybeanGlycine max (L.) Merr.
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 1 , February 2021 , pp. 128 - 135
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Weed Science Society of America

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Footnotes

Associate Editor: Lawrence E. Steckel, University of Tennessee

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