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Weed Control in Glyphosate-Resistant Corn as Affected by Preemergence Herbicide and Timing of Postemergence Herbicide Application

Published online by Cambridge University Press:  20 January 2017

Robert G. Parker ,
Alan C. York  and
David L. Jordan
Robert G. Parker*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27965-7620
Alan C. York
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27965-7620
David L. Jordan
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27965-7620
*
Corresponding author's E-mail: robbie_parker@ncsu.edu
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Abstract

Field studies were conducted at three locations during both 2002 and 2003 to evaluate weed control and response of glyphosate-resistant (GR) corn to glyphosate or nicosulfuron plus atrazine applied POST at three application timings with and without alachlor plus atrazine applied PRE. The POST herbicides were applied timely (5- to 9-cm weeds) or applications were delayed 1 or 2 wk. All treatments, except the weedy check, were followed by glyphosate postemergence-directed (PDIR) 4 wk after the timely POST application. Common lambsquarters, common ragweed, Palmer amaranth, prickly sida, and smooth pigweed were controlled at least 94% regardless of PRE or POST treatments. Large crabgrass and fall panicum were controlled at least 96% by glyphosate regardless of PRE herbicide or POST application timing. In contrast, control by nicosulfuron plus atrazine POST in the absence of PRE herbicide decreased as application was delayed. Sicklepod was controlled at least 94% when POST herbicides were applied timely, but control by both POST herbicide treatments decreased with delayed application regardless of PRE herbicide. Tall morningglory was controlled 93% or greater by POST herbicides applied timely. Control by both POST herbicide treatments decreased as application was delayed, with glyphosate being affected more by timing than nicosulfuron plus atrazine. Corn grain yield was similar with glyphosate and nicosulfuron plus atrazine. Yield was unaffected by POST application timing when PRE herbicides were included. Without PRE herbicide, grain yield decreased as POST herbicide application was delayed.

Keywords

Alachloratrazineglyphosatenicosulfuroncommon lambsquarters, Chenopodium album L. #3 CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELfall panicum, Panicum dichotomiflorum Michx. # PANDIlarge crabgrass, Digitaria sanguinalis (L) Scop. # DIGSAPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPAprickly sida, Sida spinosa L. # SIDSPsicklepod, Senna obtusifolia (L.) Irwin & Barneby # CASOBsmooth pigweed, Amaranthus hybridus L. # AMACHtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUcorn, Zea mays L. ‘Dekalb (DKC) 687 RR’, ‘Dekalb (DKC) 69-71 RR’Crop vigorherbicide-resistant cropsalachloratrazinenicosulfuronGR, glyphosate-resistantPDIR, postemergence-directedWAP, weeks after postemergence herbicide applicationWAPD, weeks after postemergence-directed herbicide application
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 564 - 570
Copyright
Copyright © Weed Science Society of America 

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