Known to scientists as Centaurea solsitialis, yellow starthistle is considered by the U.S. Department of Agriculture to be among the top 10 worst weeds in several western states and covers tens of millions of acres. It can kill horses that eat it, and other livestock will eat only small portions of very young plants. The weed displaces other plants as it spreads, and turns prime grazing land into worthless weed pastures.
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- Yellow Starthistle - UC Pest Management Guidelines University of California guidelines for control of Yellow Starthistle, including identification and biology.
- Progress in Yellow Starthistle Biological Control USDA site reports positive results on field tests using Eustenopus villosus weevils to control starthistle in Idaho.
- Centaurea solstitialis (Yellow Starthistle) Provides photographs and information on this plant and its identification.
- Yellow Starthistle Management Guide Provides detailed information about this weed, including origins, impacts, biology, management options, associated legislation and references. From the UC Davis Weed Research and Information Center.