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Release of Roadside Native Perennial Grasses following Removal of Yellow Starthistle

Stephen L. Young, Postdoctoral Research Associate, Center for Precision Agricultural Systems, Washington State University, Prosser, WA 99350,steve_young{at}wsu.edu
Vic Claassen, Associate Research Soil Scientist, Department of Land, Air and Water Resources, University of California, Davis, CA 95616

	Abstract

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The ecological benefits of a roadside native perennial grass stand are compromised when invasive species become established. We evaluated the potential to regenerate existing native perennial grass stands populated with yellow starthistle (Centaurea solstitialis) on a roadside planting in the lowland hills of the interior Coast Range of northern California. The experiment was designed to determine the effects of mowing, burning, or herbicide spraying, alone and in combination, on the vegetative cover and density of native perennial grasses and C. solstitialis. The study site contained blue wildrye (Elymus glaucus) and purple needlegrass (Nassella pulchra) as well as C. solstitialis. Burn, herbicide, and mow treatments were applied in spring 2004. After one year, C. solstitialis cover was less than 2% in all treatments that included spraying and in two years, C. solstitialis was 2% or less in all treatments except burned plots (8%) and control plots (16%). By the end of two years, percent cover and activity (i.e., growth and dormancy) of native perennial grasses were significantly greater for management treatments that included at least two of the tested vegetation control techniques. This study suggests that a combination of vegetation control techniques is necessary to nearly eliminate C. solstitialis and increase late summer cover and activity of native perennial grasses.

Keywords: blue wildrye (Elymus glaucus), dormancy, integrated roadside vegetation management, purple needlegrass (Nassella pulchra), yellow starthistle (Centaurea solstitialis)

	References

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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Young, S. L. Articles by Claassen, V. P. Search for Related Content