In-Field Movement of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Its Impact on Cotton Lint Yield: Evidence Supporting a Zero-Threshold Strategy

@inproceedings{Norsworthy2014InFieldMO,
  title={In-Field Movement of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Its Impact on Cotton Lint Yield: Evidence Supporting a Zero-Threshold Strategy},
  author={Jason K. Norsworthy and Griff M. Griffith and Terry W. Griffin and Muthukumar V. Bagavathiannan and Edward E. Gbur},
  booktitle={Weed Science},
  year={2014}
}
Abstract This research was aimed at understanding how far and how fast glyphosate-resistant (GR) Palmer amaranth will spread in cotton and the consequences associated with allowing a single plant to escape control. Specifically, research was conducted to determine the collective impact of seed dispersal agents on the in-field expansion of GR Palmer amaranth, and any resulting yield reductions in an enhanced GR cotton system where glyphosate was solely used for weed control. Introduction of 20… 
Susceptibility of Palmer Amaranth (Amaranthus palmeri) to Herbicides in Accessions Collected from the North Carolina Coastal Plain
TLDR
Data suggest A. palmeri resistant to chemistries other than glyphosate and thifensulfuron-methyl are present in NC, which highlights the need for weed management approaches to mitigate the evolution and spread of herbicide-resistant populations.
High-residue cover crops alone or with strategic tillage to manage glyphosate-resistant Palmer amaranth (Amaranthus palmeri) in southeastern cotton (Gossypium hirsutum)
Glyphosate-resistant (GR) Palmer amaranth (Amaranthus palmeri S. Wats) is redefining row crop weed management in the southeast United States due to its widespread distribution, high competitive
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TLDR
The data suggest the following two possible scenarios: either glyphosate resistance was introduced to the Arizona locality from the east, or resistance evolved independently in Arizona, and glyphosate resistance in the Georgia and Tennessee localities most likely evolved separately.
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TLDR
For the effective in-crop management of Palmer amaranth, growers should apply herbicides with different modes of action in tank-mixture and should also incorporate cultural practices including inversion till‐ age and cover crops along with herbicide programs.
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Palmer Amaranth (Amaranthus palmeri) Damage Niche in Illinois Soybean Is Seed Limited
TLDR
The results highlight the urgent need for weed managers to learn Palmer amaranth identification, prevent seed introduction, and maintain a policy of zero seed return.
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TLDR
Results illustrate the importance of controlling weeds during the first three weeks of the season relative to contributions of A. palmeri to the weed seed bank and is the first report comparing seed production in presence of these crops in a manner allowing a statistical comparison of seed production.
Evaluating Cover Crops and Herbicides for Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri ) Control in Cotton
TLDR
Cereal rye, crimson clover, hairy vetch, winter wheat, and combinations of one grass plus one legume were compared with winter weeds without a cover crop followed by fluometuron or acetochlor applied PRE, finding the cereal rye and wheat provided the best Palmer amaranth control.
Evaluation of POST-Harvest Herbicide Applications for Seed Prevention of Glyphosate-Resistant Palmer amaranth (Amaranthus palmeri)
TLDR
Evaluated POST weed management programs applied after harvest for prevention of seed production from GR Palmer amaranth and to evaluate herbicide carryover to winter wheat found that Wheat injury was evident from the PRE applications, but not in 2013.
Critical timing of Palmer amaranth (Amaranthus palmeri) removal in sweetpotato
TLDR
The results show that Palmer amaranth is highly competitive with sweetpotato and should be managed as early as possible in the season, and the requirement of an early critical timing of weed removal to prevent yield loss emphasizes the importance of early-season scouting.
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