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Response of Northeastern Arkansas Palmer Amaranth (Amaranthus Palmeri) Accessions to Glyphosate

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy ,
Robert C. Scott ,
Kenneth L. Smith  and
Lawrence R. Oliver
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Science, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
Department of Crop, Soil, and Environmental Science, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Kenneth L. Smith
Affiliation:
Department of Crop, Soil, and Environmental Science, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Science, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: jnorswor@uark.edu
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Abstract

Palmer amaranth accessions were collected from 21 fields in northeastern Arkansas in the fall of 2006 to determine if they differed in response to increasing doses of glyphosate and to determine the survival frequency following treatment with the label rate (870 g ae/ha). The herbicide dose required to kill 50% of individuals in an accession (LD50) ranged from 41 to 339 g/ha glyphosate, with most accessions responding similarly to glyphosate. The AR18 and AR19 were the least-sensitive accessions, with LD50 rates of 312 and 339 g/ha glyphosate, respectively. The mean survival frequency was 2.2% across all accessions when 870 g/ha glyphosate was applied to five- to seven-leaf plants. Sixteen of the accessions had at least one plant survive glyphosate at 870 g/ha. AR18 and AR19 accessions had a survival frequency of 6.3 and 11.8%, respectively. Following an additional cycle of selection with glyphosate, 44.3% of the progeny from the AR19 accession survived glyphosate at 870 g/ha, and its LD50 value significantly increased to 646 g/ha glyphosate. This research shows that there is a low percentage of Palmer amaranth plants currently present in production fields throughout northeastern Arkansas that are capable of surviving a single glyphosate application at the labeled rate and that further selection with glyphosate can increase the frequency of survival.

Keywords

GlyphosatePalmer amaranth, Amaranthus palmeri S. Wats. AMAPAGlyphosate resistanceherbicide resistanceherbicide toleranceselection for resistanceweed
Type
Weed Management — Major Crops
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 408 - 413
Copyright
Copyright © Weed Science Society of America 

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