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Evaluation of Postemergence Weed Control Strategies in Herbicide-Resistant Isolines of Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Karen A. Zuver ,
Mark L. Bernards ,
James J. Kells ,
Christy L. Sprague ,
Case R. Medlin  and
Mark M. Loux
Karen A. Zuver
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Mark L. Bernards
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
James J. Kells*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Christy L. Sprague
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Case R. Medlin
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47607
Mark M. Loux
Affiliation:
Department of Horticulture and Crop Sciences, The Ohio State University, Columbus, OH 43210
*
Corresponding author's E-mail: kells@msu.edu
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Abstract

Herbicide-resistant corn hybrids offer additional options for POST weed control in corn, and growers may benefit from information on the consistency of these weed-control strategies. Studies were conducted in Indiana, Illinois, Michigan, and Ohio, in 2000 and 2001, to evaluate weed control among herbicide strategies for imidazolinone-resistant, glufosinate-resistant, glyphosate-resistant, and conventional corn. Isogenic hybrids were utilized to minimize variation in growth and yield potential among hybrids. The glyphosate-resistant corn postemergence (glyphosate-POST) treatment provided more consistent control of giant foxtail than the PRE, conventional corn postemergence (conventional-POST), glufosinate-resistant corn postemergence (glufosinate-POST), and imidazolinone-resistant corn postemergence (imi-POST) treatments. All four POST treatments were more consistent and provided greater control than the PRE treatment of the large-seeded broadleaf weeds velvetleaf, giant ragweed, common cocklebur, and morningglory species. Conventional-POST and imi-POST were more consistent than glufosinate-POST and glyphosate-POST treatments in controlling giant ragweed. There were no statistical differences in the variability of PRE or POST treatments for control of common lambsquarters, common ragweed, and redroot pigweed. Corn yield varied among locations and years. The glyphosate-POST treatment did not reduce yield relative to the weed-free treatment, the imi-POST and glufosinate-POST treatments each reduced yield in one of eight locations, and the conventional-POST treatment reduced yield in three of eight locations.

Keywords

Metolachloratrazinenicosulfuronrimsulfurondicambaimazethapyrimazapyrglufosinateglyphosatecommon cocklebur, Xanthium strumarium L. #3 XANSTcommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELgiant foxtail, Setaria faberi (L.) Herrm. # SETFAgiant ragweed, Ambrosia trifida L. # AMBTRmorningglory species, Ipomea spp. # IPOSSredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medicus # ABUTHcorn, Zea mays L. # ZEAMXCorn yieldherbicide-resistant cropherbicide systemIpomea species, conventional corn, imidazolinoneAMS, ammonium sulfatecrm, comparative relative maturityDAP, days after postemergence
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 172 - 178
Copyright
Copyright © Weed Science Society of America 

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