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Response of Palmer Amaranth (Amaranthus palmeri) Accessions to Glyphosate, Fomesafen, and Pyrithiobac

Published online by Cambridge University Press:  20 January 2017

Jason A. Bond ,
Lawrence R. Oliver  and
Daniel O. Stephenson IV
Jason A. Bond*
Affiliation:
Department of Crop, Soil and Environmental Sciences, University of Arkansas, 115 Plant Science, Fayetteville, AR 72704
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil and Environmental Sciences, University of Arkansas, 115 Plant Science, Fayetteville, AR 72704
Daniel O. Stephenson IV
Affiliation:
Department of Crop, Soil and Environmental Sciences, University of Arkansas, 115 Plant Science, Fayetteville, AR 72704
*
Corresponding author's E-mail: JBond@agctr.lsu.edu.
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Abstract

Field studies were conducted at Fayetteville, Arkansas, to determine whether 47 Palmer amaranth accessions from different areas of the southern United States varied in response to postemergence applications of the registered rates of the isopropylamine salt of glyphosate (840 g ae/ha), fomesafen (420 g ai/ha), and pyrithiobac (70 g ai/ha). Glyphosate controlled all Palmer amaranth accessions at least 99% 21 d after treatment (DAT). Palmer amaranth control with fomesafen was equivalent for all accessions and at least 96% 21 DAT. Percent dry weight reductions were at least 92 and 94% for glyphosate and fomesafen, respectively. Palmer amaranth control with pyrithiobac was variable and ranged from 20 to 94% 21 DAT, but differences could not be attributed to accession origin. Herbicides with alternate modes of action from pyrithiobac should be utilized for Palmer amaranth control in regions where pyrithiobac has been used continuously.

Keywords

Fomesafen, glyphosate, pyrithiobac, Palmer amaranth, Amaranthus palmeri (S.) Wats. #3 AMAPAAccessiondry weight reductionsecotypeherbicide response variabilityALS, acetolactate synthase (EC 4.1.3.18)DAE, days after emergenceDAT, days after treatment
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 885 - 892
Copyright
Copyright © Weed Science Society of America 

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