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Confirmation and Control of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Arkansas

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy ,
Griff M. Griffith ,
Robert C. Scott ,
Kenneth L. Smith  and
Lawrence R. Oliver
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Science
Griff M. Griffith
Affiliation:
Crop, Soil and Environmental Science
Robert C. Scott
Affiliation:
University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Kenneth L. Smith
Affiliation:
University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Lawrence R. Oliver
Affiliation:
University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: [email protected]
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Abstract

Failure of glyphosate to control Palmer amaranth was first reported in Arkansas in Mississippi County in June, 2005. The objectives of this research were to (a) confirm glyphosate-resistant Palmer amaranth in Arkansas, and (b) determine the effectiveness of 15 postemergence- (POST) applied herbicides comprising eight modes of action in controlling the glyphosate-resistant biotype compared to glyphosate-susceptible accessions. The LD50 values were similar among three susceptible Palmer amaranth accessions, ranging from 24.4 to 35.5 g ae/ha glyphosate. The resistant biotype had an LD50 of 2,820 g/ha glyphosate, which was 79- to 115-fold greater than that of the susceptible biotypes and 3.4 times a normal glyphosate-use rate of 840 g/ha. The glyphosate-resistant biotype was effectively controlled with most of the evaluated herbicides, but the use of acetolactate synthase-inhibiting herbicides such as pyrithiobac, trifloxysulfuron, and imazethapyr is not a viable option for control of this Palmer amaranth population.

Keywords

GlyphosateAmaranthus palmeri S. Wats. AMAPAGlyphosate resistanceherbicide resistancepostemergence herbicides
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 108 - 113
Copyright
Copyright © Weed Science Society of America 

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