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Efficacy and Economics of Weed Management in Glyphosate-Resistant Corn (Zea mays)1

Published online by Cambridge University Press:  20 January 2017

William G. Johnson ,
Pauley R. Bradley ,
Stephen E. Hart ,
Michelle L. Buesinger  and
Raymond E. Massey
William G. Johnson*
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65211
Pauley R. Bradley
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65211
Stephen E. Hart
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Michelle L. Buesinger
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Raymond E. Massey
Affiliation:
Department of Agricultural Economics, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: johnsonwg@missouri.edu.
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Abstract

Field experiments were conducted in 1997 and 1998 near Columbia and Novelty, MO, and Urbana, IL, to evaluate crop injury, weed control, corn yield, and net economic returns provided by weed control programs in glyphosate-resistant corn. The herbicide programs evaluated included acetochlor preemergence (PRE) followed by (fb) glyphosate with or without atrazine postemergence (POST) and total POST programs consisting of single and sequential applications of glyphosate alone and tank-mixed with actochlor, atrazine, or both. Metolachlor PRE fb dicamba plus atrazine POST and metolachlor plus atrazine PRE were included for comparison. In the total POST treatments, mid-post (MPOST) applications provided better control than early-post (EPOST) applications on weeds that germinated throughout the growing season such as shattercane and common cocklebur, but also resulted in yield reductions of up to 23% caused by early-season weed competition. The addition of atrazine to glyphosate POST generally increased control of common cocklebur, morningglory species, and common waterhemp. EPOST or PRE fb EPOST applications generally provided higher yields than MPOST treatments, although MPOST treatments often provided equal or greater weed control at midseason. Treatments including two herbicide applications tended to provide greater weed control, yield, and profit than those with a single application. Input costs for glyphosate-resistant corn are slightly higher than nontransgenic hybrids. However, net economic returns are similar and the use of glyphosate POST allows greater flexibility in POST weed management decisions.

Keywords

Acetochlor, 2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamideatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminedicamba, 3,6-dichloro-2-methoxybenzoic acidglyphosate, N-(phosphonomethyl)glycinemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidecommon cocklebur, Xanthium strumarium L.# XANSTcommon waterhemp, Amaranthus rudis Sauer # AMATAivyleaf morningglory, Ipomoea hederaceae (L.) Jacq. # IPOHEpitted morningglory, Ipomoea lacunosa L. # IPOLAshattercane, Sorghum bicolor (L.) Moench. # SORVUcorn Zea mays L. # ZEAMX ‘MON802’Corn yieldacetochloratrazinedicambaeconomic returnsmetolachlorAMATAABUTHCHEALIPOHEIPOLAPOLPYSETFASORVUXANSTZEAMXALS, autolactate synthaseEPOST, early postemergencefb, followed byMPOST, mid-postemergenceOM, organic matterPOST, postemergencePRE, preemergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 57 - 65
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Publication 12,974 from the Missouri Agricultural Experiment Station Journal Series.

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