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Weed Control in Glufosinate-Resistant Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Allan S. Hamill ,
Stevan Z. Knezevic ,
Kevin Chandler ,
Peter H. Sikkema ,
François J. Tardif ,
Anil Shrestha  and
Clarence J. Swanton
Allan S. Hamill
Affiliation:
Agriculture and Agri-Food Canada, Harrow, ON, Canada NOR 1GO
Stevan Z. Knezevic
Affiliation:
Department of Plant Agriculture, University of Guelph, ON, Canada N1G 2W1
Kevin Chandler
Affiliation:
Department of Plant Agriculture, University of Guelph, ON, Canada N1G 2W1
Peter H. Sikkema
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, ON, Canada NOP 2CO
François J. Tardif
Affiliation:
Department of Plant Agriculture, University of Guelph, ON, Canada N1G 2W1
Anil Shrestha
Affiliation:
Department of Plant Agriculture, University of Guelph, ON, Canada N1G 2W1
Clarence J. Swanton*
Affiliation:
Department of Plant Agriculture, University of Guelph, ON, Canada N1G 2W1
*
Corresponding author's E-mail: cswanton@plant.uoguelph.ca.
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Abstract

The development of glufosinate-resistant corn represents a new weed management system for corn growers. Field experiments were conducted from 1995 to 1997 at four locations in southwestern Ontario. The objective of this study was to determine the effect of timing of weed control relative to the growth stage of corn with glufosinate applied alone or in combination with residual herbicides. Control of all species tested improved with the addition of atrazine plus dicamba to glufosinate, applied from the two- to eight-leaf stage of corn growth. Based on a 90% weed dry matter reduction, glufosinate with atrazine plus dicamba controlled common ragweed, common lambsquarters, and pigweed species at the three-leaf stage of corn and yellow foxtail, barnyardgrass, and large crabgrass at the two-, four-, and eight-leaf stage of corn, respectively. Weed control with glufosinate alone was improved when applied at the later growth stages of corn. Glufosinate applied alone at the four-leaf stage of corn controlled common ragweed and common lambsquarters, whereas pigweed species were controlled effectively at the eight-leaf stage of corn growth. Corn grain yield was consistently higher when glufosinate was applied in combination with residual herbicides, compared to glufosinate alone. Glufosinate in combination with residual herbicides applied to corn at the three- to five-leaf stage may represent the best timing for weed control. Our data suggested that a tank mixture of glufosinate with other postemergence residual herbicides or a split application of glufosinate in combination with cultivation may be required for weed control in glufosinate-resistant corn.

Keywords

AtrazinedicambaSAN 582 (proposed name, dimethenamid), 2-chloro-N-[(1-methyl-2-methoxy)ethyl]-N-(2,4-dimethyl-thien-3-yl)-acetamideglufosinatemetolachlorredroot pigweed, Amaranthus retroflexus L. #3 AMAREcommon lambsquarters, Chenopodium album L. # CHEALyellow foxtail, Setaria glauca (L.) Beauv. # SETGLlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCRcommon ragweed, Ambrosia artemisiifolia L. # AMBELcorn, Zea mays L.Integrated weed managementDAE, days after emergenceDM, dry matterHRC, herbicide-resistant cropsIWM, integrated weed managementPOST, postemergencePRE, preemergence

Information

Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 578 - 585
Copyright
Copyright © Weed Science Society of America 

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