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Loss of Glyphosate Efficacy: A Changing Weed Spectrum in Georgia Cotton

Published online by Cambridge University Press:  20 January 2017

Theodore M. Webster  and
Lynn M. Sosnoskie
Theodore M. Webster*
Affiliation:
Crop Protection and Management Research Unit, USDA-Agricultural Research Service, Tifton, GA 31793-0748
Lynn M. Sosnoskie
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Tifton, GA 31794
*
Corresponding author's E-mail: [email protected]
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Abstract

Introduction of glyphosate resistance into crops through genetic modification has revolutionized crop protection. Glyphosate is a broad-spectrum herbicide with favorable environmental characteristics and effective broad-spectrum weed control that has greatly improved crop protection efficiency. However, in less than a decade, the utility of this technology is threatened by the occurrence of glyphosate-tolerant and glyphosate-resistant weed species. Factors that have contributed to this shift in weed species composition in Georgia cotton production are reviewed, along with the implications of continued overreliance on this technology. Potential scenarios for managing glyphosate-resistant populations, as well as implications on the role of various sectors for dealing with this purported tragedy of the commons, are presented. Benghal dayflower, a glyphosate-tolerant species, continues to spread through Georgia and surrounding states, whereas glyphosate susceptibility in Palmer amaranth is endangered in Georgia and other cotton-producing states in the southern United States. Improved understanding of how glyphosate susceptibility in our weed species spectrum was compromised (either through occurrence of herbicide-tolerant or -resistant weed species) may allow us to avoid repeating these mistakes with the next herbicide-resistant technology.

Keywords

GlyphosateBenghal dayflower, Commelina benghalensis L.Palmer amaranth, Amaranthus palmeri S. Watscotton, Gossypium hirsutum L.Amaranthus palmeriBenghal dayflowerCommelina benghalensisglyphosateherbicide resistanceherbicide tolerancePalmer amaranthtragedy of the commonstropical spiderwort
Type
Special Topics
Information
Weed Science , Volume 58 , Issue 1 , March 2010 , pp. 73 - 79
Copyright
Copyright © Weed Science Society of America 

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References

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