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Palmer Amaranth (Amaranthus palmeri) Damage Niche in Illinois Soybean Is Seed Limited

Published online by Cambridge University Press:  20 January 2017

Adam S. Davis ,
Brian J. Schutte ,
Aaron G. Hager  and
Bryan G. Young
Adam S. Davis*
Affiliation:
U.S. Department of Agriculture–Agricultural Research Service, Urbana, IL 61801
Brian J. Schutte
Affiliation:
Department of Entomology, Pathology and Weed Science, New Mexico State University, Las Cruces, NM 88003
Aaron G. Hager
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Bryan G. Young
Affiliation:
Southern Illinois University, Carbondale, IL 62901
*
Corresponding author's E-mail: asdavis1@illinois.edu
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Abstract

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Palmer amaranth, a dioecious summer annual forb, originating in Sonoran desert washes, compromises crop yields in much of the southern United States and its range is expanding northward. Appropriate tactics for managing this weed proactively in the Upper Midwest will depend on characterizing its damage niche, the geographic range in which it can reduce crop yields. We implemented a common garden study in 2011 and 2012, planting eight accessions of Palmer amaranth from the southern and midwestern United States, into soybean crops in southern, central, and northern Illinois, at a population density of 8 plants m−2 with a biocontainment protocol. Once Palmer amaranth plants initiated flowering, they were removed and burned. Weed survival, flowering, and weed biomass were measured, in addition to soybean yield and weather data. Analyses indicated that Palmer amaranth's damage niche in Illinois soybean was independent of weed genotype or maternal environment. Despite competing only briefly, Palmer amaranth reduced soybean yields in all site–years, indicating its damage niche in Illinois, and much of the Midwest, is limited primarily by seed immigration rate. These results highlight the urgent need for weed managers to learn Palmer amaranth identification, prevent seed introduction, and maintain a policy of zero seed return.

Keywords

Palmer amaranth, Amaranthus palmeri S. Wats.soybean, Glycine max (L.) Merr.Common garden experimentgenetic and environmental variationgeographic range expansionglobal changeweed–crop interference
Type
Weed Biology and Ecology
Information
Weed Science , Volume 63 , Issue 3 , September 2015 , pp. 658 - 668
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Weed Science Society of America

Footnotes

Current address: Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907.

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