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Yellow Nutsedge (Cyperus esculentus) and Annual Weed Control in Glyphosate-Resistant Field Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

David W. Fischer  and
R. Gordon Harvey
David W. Fischer*
Affiliation:
UW-Extension Crops and Soils Agent, Dane County, Madison, WI 53718
R. Gordon Harvey
Affiliation:
UW-Extension Crops and Soils Agent, Dane County, Madison, WI 53718
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments evaluated halosulfuron and glyphosate for yellow nutsedge control in glyphosate-resistant field corn in 1997 and 1998. Treatments included single and sequential glyphosate applications with or without halosulfuron. Single glyphosate applications provided less than 75% yellow nutsedge control. Sequential applications with at least 1.68 kg ae/ha of glyphosate provided 85% or greater yellow nutsedge control 82 or 115 d after treatment (DAT). Halosulfuron was required to consistently obtain 80% or greater yellow nutsedge control. Nearly all treatments resulted in 90% or greater velvetleaf control 82 or 115 DAT. At the same rating times, giant foxtail control was 95% or greater for sequential glyphosate treatments and treatments containing acetochlor. Corn treated with sequential glyphosate applications containing at least 1.26 kg/ha of glyphosate or containing halosulfuron resulted in greater corn yields than with single glyphosate applications. Halosulfuron was required for consistent yellow nutsedge control, but halosulfuron did not control grasses.

Keywords

Acetochlorglyphosatehalosulfurongiant foxtail, Setaria faberi Herrm. #3 SETFAvelvetleaf, Abutilon theophrasti Medicus # ABUTHyellow nutsedge, Cyperus esculentus L. # CYPEScorn, Zea mays L. ‘MON-802 RR’, ‘Dekalb DK493RR’Amaranthus retroflexusAMS, ammonium sulfateDAT, days after treatmentgly-R, glyphosate resistantLPST, late postemergencePOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 16 , Issue 3 , September 2002 , pp. 482 - 487
Copyright
Copyright © Weed Science Society of America 

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References

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