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Grassland Response to Herbicides and Seeding of Native Grasses 6 Years Posttreatment

Published online by Cambridge University Press:  20 January 2017

Bryan A. Endress
Affiliation:
Division of Applied Plant Ecology, Institute for Conservation Research, San Diego Zoo Global, 15600 San Pasqual Valley Road, Escondido, CA 92027
Catherine G. Parks*
Affiliation:
Pacific Northwest Research Station, U.S. Department of Agriculture Forest Service, Forestry and Range Sciences Laboratory, 1401 Gekeler Lane, La Grande, OR 97850
Bridgett J. Naylor
Affiliation:
Pacific Northwest Research Station, U.S. Department of Agriculture Forest Service, Forestry and Range Sciences Laboratory, 1401 Gekeler Lane, La Grande, OR 97850
Steven R. Radosevich
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331
Mark Porter
Affiliation:
Wallowa Resources, 200 W. North St., Enterprise, OR 97828
*
Corresponding author's E-mail: [email protected]

Abstract

Herbicides are the primary method used to control exotic, invasive plants. This study evaluated restoration efforts applied to grasslands dominated by an invasive plant, sulfur cinquefoil, 6 yr after treatments. Of the five herbicides we evaluated, picloram continued to provide the best control of sulfur cinquefoil over 6 yr. We found the timing of picloram applications to be important to the native forb community. Plots with picloram applied in the fall had greater native forb cover. However, without the addition of native perennial grass seeds, the sites became dominated by exotic grasses. Seeding resulted in a 20% decrease in exotic grass cover. Successful establishment of native perennial grasses was not apparent until 6 yr after seeding. Our study found integrating herbicide application and the addition of native grass seed to be an effective grassland restoration strategy, at least in the case where livestock are excluded.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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