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Weed Management in Glufosinate- and Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

A. Stanley Culpepper ,
Alan C. York ,
Roger B. Batts  and
Katherine M. Jennings
A. Stanley Culpepper
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York*
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Roger B. Batts
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Katherine M. Jennings
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected].
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Abstract

An experiment was conducted at six locations in North Carolina to compare weed-management treatments using glufosinate postemergence (POST) in glufosinate-resistant soybean, glyphosate POST in glyphosate-resistant soybean, and imazaquin plus SAN 582 preemergence (PRE) followed by chlorimuron POST in nontransgenic soybean. Prickly sida and sicklepod were controlled similarly and 84 to 100% by glufosinate and glyphosate. Glyphosate controlled broadleaf signalgrass, fall panicum, goosegrass, rhizomatous johnsongrass, common lambsquarters, and smooth pigweed at least 90%. Control of these weeds by glyphosate often was greater than control by glufosinate. Mixing fomesafen with glufosinate increased control of these species except johnsongrass. Glufosinate often was more effective than glyphosate on entireleaf and tall morningglories. Fomesafen mixed with glyphosate increased morningglory control but reduced smooth pigweed control. Glufosinate or glyphosate applied sequentially or early postemergence (EPOST) following imazaquin plus SAN 582 PRE often were more effective than glufosinate or glyphosate applied only EPOST. Only rhizomatous johnsongrass was controlled more effectively by glufosinate or glyphosate treatments than by imazaquin plus SAN 582 PRE followed by chlorimuron POST. Yields and net returns with soil-applied herbicides only were often lower than total POST herbicide treatments. Sequential POST herbicide applications or soil-applied herbicides followed by POST herbicides were usually more effective economically than single POST herbicide applications.

Keywords

glufosinate, 2-amino-4-(hydroxymethylphosphinyl) butanoic acidglyphosate, N-(phosphonomethyl)glycinecarpetweed, Mollugo verticillata L. # MOLVEcommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELcutleaf groundcherry, Physalis angulata L. # PHYANeclipta, Eclipta prostrata L. # ECLALgoosegrass, Eleusine indica (L.) Gaertn. # ELEINjohnsongrass, Sorghum halepense (L.) Pers. # SORHAprickly sida, Sida spinosa L. # SIDSPsmooth pigweed, Amaranthus hybridus L. # AMACHHerbicide-resistant cropsLiberty Link soybeannontransgenic soybeanRoundup Ready soybeanDAT, days after treatmentEPOST, early postemergenceEPSPS, 5-enolpyruvylshikimate-3-phosphate synthaseLPOST, late postemergencePOST, postemergencePRE, preemergenceTHR, transgenic, herbicide-resistantWAA, weeks after late postemergence applicationWAP, weeks after planting
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 77 - 88
Copyright
Copyright © Weed Science Society of America 

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