Skip to main content
    • Aa
    • Aa

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

  • Jason A. Bond (a1), Lawrence R. Oliver (a1) and Daniel O. Stephenson (a1)

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.

Corresponding author
Corresponding author's E-mail:
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

C. N. Bensch , M. J. Horak , and D. Peterson 2003. Interference of redroot pigweed (Amaranthus retroflexus), Palmer amaranth (Amaranthus palmeri), and common waterhemp (Amaranthus rudis) in soybean. Weed Sci. 51:3743.

J. A. Bond , T. W. Walker , P. K. Bollich , C. H. Koger , and P. Gerard 2005. Seeding rates for stale seedbed rice production in the midsouthern United States. Agron J. 97:15601563.

N. R. Burgos , Y. Kuk , and R. E. Talbert 2001. Amaranthus palmeri resistance and differential tolerance of Amaranthus palmeri and Amaranthus hybridus to ALS-inhibiting herbicides. Pest Manage. Sci. 57:449457.

J. Cahoon , J. Ferguson , D. Edwards , and P. Tucker 1990. A microcomputer-based irrigation scheduler for the humid mid-south region. Appl. Eng. Agric. 6:289295.

S. G. Carmer , W. E. Nyquist , and W. M. Walker 1989. Least significant differences in combined analyses of experiments with two- or three-factor treatment designs. Agron. J. 81:665672.

A. S. Culpepper and A. C. York 2000. Weed management in ultranarrow-row cotton. Weed Technol. 14:1929.

A. G. Hager , L. M. Wax , G. A. Bollero , and E. W. Stoller 2003. Influence of diphenylether herbicide application rate and timing on common waterhemp (Amaranthus rudis) control in soybean (Glycine max). Weed Technol. 17:1420.

M. J. Horak and T. M. Loughin 2000. Growth analysis of four Amaranthus species. Weed Sci. 48:347355.

R. A. Massinga , R. S. Currie , M. J. Horak , and J. Boyer Jr. 2001. Interference of Palmer amaranth in corn. Weed Sci. 49:202208.

J. W. Moore , D. S. Murray , and R. B. Westerman 2004. Palmer amaranth (Amaranthus palmeri) effects on the harvest and yield of grain sorghum (Sorghum bicolor). Weed Technol. 18:2329.

G. D. Morgan , P. A. Bauman , and J. M. Chandler 2001. Competitive impact of Palmer amaranth (Amaranthus palmeri) on cotton (Gossypium hirsutum) development and yield. Weed Technol. 15:408412.

B. V. Ottis , J. H. O'Barr , G. N. Mccauley , and J. M. Chandler 2004. Imazethapyr is safe and effective for imidazolinone-tolerant rice grown on coarse-textured soils. Weed Technol. 18:10961100.

W. L. Patzoldt , P. J. Tranel , and A. G. Hager 2002. Variable herbicide responses among Illinois waterhemp (Amaranthus rudis and A. tuberculatus) populations. Crop Prot. 21:707712.

G. H. Scott , S. D. Askew , and J. W. Wilcut 2002. Glyphosate systems for weed control in glyphosate-tolerant cotton (Gossypium hirsutum). Weed Technol. 16:191198.

B. A. Sellers , R. J. Smeda , W. G. Johnson , J. A. Kendig , and M. R. Ellersick 2003. Comparative growth of six Amaranthus species in Missouri. Weed Sci. 51:329333.

D. E. Shoup , K. Al-Khatib , and D. E. Peterson 2003. Common waterhemp (Amaranthus rudis) resistance to protoporphyrinogen oxidase-inhibiting herbicides. Weed Sci. 51:145150.

D. T. Smith , R. V. Baker , and G. L. Steele 2000. Palmer amaranth (Amaranthus palmeri) impacts on yield, harvesting, and ginning in dryland cotton (Gossypium hirsutum). Weed Technol. 14:122126.

D. O. Stephenson IV, J. A. Bond , E. R. Walker , M. T. Bararpour , and L. R. Oliver 2004. Evaluation of mesotrione in Mississippi delta corn production. Weed Technol. 18:11111116.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *



Full text views

Total number of HTML views: 0
Total number of PDF views: 2 *
Loading metrics...

Abstract views

Total abstract views: 22 *
Loading metrics...

* Views captured on Cambridge Core between 20th January 2017 - 29th May 2017. This data will be updated every 24 hours.