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Late-Season Targeted Grazing of Yellow Starthistle (Centaurea solstitialis) with Goats in Idaho

Published online by Cambridge University Press:  20 January 2017

Brianna J. Goehring ,
Karen L. Launchbaugh  and
Linda M. Wilson
Brianna J. Goehring
Affiliation:
Department of Rangeland Ecology and Management, University of Idaho, Moscow, ID 83844
Karen L. Launchbaugh*
Affiliation:
Department of Rangeland Ecology and Management, University of Idaho, Moscow, ID 83844
Linda M. Wilson
Affiliation:
Invasive Plant Management; British Columbia Ministry of Agriculture and Lands, Abbotsford, BC, Canada V3G2M3
*
Corresponding author's E-mail: [email protected]
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Abstract

Yellow starthistle (Centaurea solstitialis) is an exotic winter annual forb that is aggressively invasive and problematic in much of California, Idaho, Oregon, and Washington. Yellow starthistle control is particularly challenging in canyon rangelands where accessibility limits control options. Our objective was to evaluate the effects of late-season targeted goat grazing on yellow starthistle and nontarget grasses and forbs. A 3-yr grazing study was initiated in 2006 on a 380-ha (939 acres) canyon grassland site infested with yellow starthistle near White Bird, ID. Twenty-four paired plots were established, with each pair including a fenced subplot to exclude grazing and a similar-sized adjacent subplot that was grazed. Density of yellow starthistle plants and seedheads was assessed after grazing of each plot in all 3 yr and before grazing in the second and third years. Canopy cover of yellow starthistle, grasses, and forbs also was measured. Grazed subplots had 58% fewer yellow starthistle plants than the ungrazed controls after grazing was applied and 94% fewer seedheads after 3 yr of grazing. Cover of yellow starthistle did not differ between grazed and ungrazed subplots after grazing in 2006, whereas grazing decreased yellow starthistle cover in 2007 and 2008 by about 75%. Goat grazing had little impact on canopy cover of grasses and resident forbs, with the exception of after grazing in 2007 when there was less forb cover in grazed areas compared with ungrazed areas. Late-season (i.e., July to November) targeted goat grazing appears to be an effective way to reduce yellow starthistle plant densities at landscape scales, which creates a large window of opportunity for grazing treatment and flexibility for land and livestock managers.

Keywords

Yellow starthistleCentaurea solstitialis L. CENSO.Centaurea solstitialisinvasive plantsprescribed grazing
Type
Research
Information
Invasive Plant Science and Management , Volume 3 , Issue 2 , August 2010 , pp. 148 - 154
Copyright
Copyright © Weed Science Society of America 

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