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Control of glyphosate/glufosinate-resistant volunteer corn in corn resistant to aryloxyphenoxypropionates

Published online by Cambridge University Press:  13 April 2020

Adam Striegel ,
Nevin C. Lawrence ,
Stevan Z. Knezevic ,
Jeffrey T. Krumm ,
Gary Hein  and
Amit J. Jhala Open the ORCID record for Amit J. Jhala [Opens in a new window]
Adam Striegel
Affiliation:
Graduate Student, Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE, USA
Nevin C. Lawrence
Affiliation:
Assistant Professor, Panhandle Research and Extension Center, University of Nebraska–Lincoln, Scottsbluff, NE, USA
Stevan Z. Knezevic
Affiliation:
Professor, Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE, USA
Jeffrey T. Krumm
Affiliation:
Field Development Scientist, Corteva Agriscience, Hastings, NE, USA
Gary Hein
Affiliation:
Director, Doctor of Plant Health Professional Program and Professor, Department of Entomology, University of Nebraska–Lincoln, Lincoln, NE, USA
Amit J. Jhala*
Affiliation:
Associate Professor, Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE, USA
*
Author for correspondence: Amit J. Jhala, Department of Agronomy and Horticulture, University of Nebraska–Lincoln, 279 Plant Science Hall, P.O. Box 830915, Lincoln, NE68588. Email: Amit.Jhala@unl.edu
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Abstract

Corn-on-corn production systems, common in highly productive irrigated fields in South Central Nebraska, can create issues with volunteer corn management in corn fields. EnlistTM corn is a new multiple herbicide–resistance trait providing resistance to 2,4-D, glyphosate, and the aryloxyphenoxypropionate herbicides (FOPs), commonly integrated in glufosinate-resistant germplasm. The objectives of this study were to (1) evaluate ACCase-inhibiting herbicides for glyphosate/glufosinate-resistant volunteer corn control in Enlist corn and (2) evaluate the effect of ACCase-inhibiting herbicide application timing (early POST vs. late POST) on volunteer corn control, Enlist corn injury, and yield. Field experiments were conducted in 2018 and 2019 at South Central Agricultural Laboratory near Clay Center, NE. Glyphosate/glufosinate-resistant corn harvested the year prior was cross-planted at 49,000 seeds ha–1 to mimic volunteer corn in this study. After 7 to 10 d had passed, Enlist corn was planted at 91,000 seeds ha–1. Application timing of FOPs (fluazifop, quizalofop, and fluazifop/fenoxaprop) had no effect on Enlist corn injury or yield, and provided 97% to 99% control of glyphosate/glufosinate-resistant volunteer corn at 28 d after treatment (DAT). Cyclohexanediones (clethodim and sethoxydim; DIMs) and phenylpyrazolin (pinoxaden; DEN) provided 84% to 98% and 65% to 71% control of volunteer corn at 28 DAT, respectively; however, the treatment resulted in 62% to 96% Enlist corn injury and 69% to 98% yield reduction. Orthogonal contrasts comparing early-POST (30-cm-tall volunteer corn) and late-POST (50-cm-tall volunteer corn) applications of FOPs were not significant for volunteer corn control, Enlist corn injury, and yield. Fluazifop, quizalofop, and fluazifop/fenoxaprop resulted in 94% to 99% control of glyphosate/glufosinate-resistant volunteer corn with no associated Enlist corn injury or yield loss; however, quizalofop is the only labeled product as of 2020 for control of volunteer corn in Enlist corn.

Keywords

ACCase-inhibiting herbicidescrop rotationDIMsFOPsweed managementClethodim, fenoxaprop-p-ethyl, fluazifop-p-butylpinoxadenquizalofop-p-ethylsethoxydimfield corn, Zea mays L
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 3 , June 2020 , pp. 309 - 317
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: William Johnson, Purdue University

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