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Response of Deeproot Sedge (Cyperus entrerianus) to Herbicide and Prescribed Fire in Texas Coastal Prairie

Published online by Cambridge University Press:  20 January 2017

Jonathan R. King ,
Andrew J. Bennett ,
Warren C. Conway ,
David J. Rosen  and
Brian P. Oswald
Jonathan R. King
Affiliation:
Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University, Nacogdoches, TX 75962-6109
Andrew J. Bennett
Affiliation:
Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University, Nacogdoches, TX 75962-6109
Warren C. Conway*
Affiliation:
Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University, Nacogdoches, TX 75962-6109
David J. Rosen
Affiliation:
Department of Biology, Lee College, Baytown, TX 77522
Brian P. Oswald
Affiliation:
Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University, Nacogdoches, TX 75962-6109
*
Corresponding author's E-mail: warren.conway@ttu.edu
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Abstract

Introduced accidentally from South America, deeproot sedge is rapidly expanding in a variety of habitats throughout the southeastern United States. Of particular concern is its rapid expansion, naturalization, and formation of monocultures in Texas coastal prairie, one of the most imperiled temperate ecoregions in North America. The objective of this research was to examine how deeproot sedge responds to prescribed fire, to the herbicide imazapic, and to treatment combinations of both. Combinations of prescribed fire and imazapic treatments and imazapic-only treatments effectively reduced deeproot sedge cover and frequency. However, plots exposed to dormant season fires (with no imazapic) had greater deeproot sedge cover after burn treatments were applied, indicating that coastal prairie management using only dormant season prescribed fire will not work toward reduction or management of this exotic invasive species. Although deeproot sedge cover was often reduced in fire–imazapic treatment combinations, it was still present in treatment plots. Moreover, desirable functional plant groups (i.e., native bunchgrasses) did not respond positively to the fire–imazapic treatments, but in some instances, woody plant coverage increased. Repeated, long-term approaches using integrated and coordinated efforts with multiple treatment options will be necessary to restore community structure to desired compositional levels. Such integrated approaches should be effective in reducing deeproot sedge frequency, cover, and extent to more manageable levels throughout its introduced geographic range.

Keywords

Imazapicdeeproot sedge, Cyperus entrerianus BoeckCoastal prairieCyperus entrerianusdeeproot sedgeherbicide imazapicinvasiveprescribed fireTexas
Type
Research Article
Information
Invasive Plant Science and Management , Volume 8 , Issue 1 , March 2015 , pp. 15 - 31
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Southwest Louisiana National Wildlife Refuge Complex, Bell City, LA 70630

Current address: Department of Natural Resources Management, Texas Tech University, Lubbock, TX 79409-2125

References

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