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Creator:: Detweiler, Amy Jo and Oregon State University. Extension Service
Abstract:: Four species of Centaurea are commonly found in central and eastern Oregon, including spotted knapweed (Centaurea maculosa), diffuse knapweed (Centaurea diffusa), Russian knapweed (Centaurea repens), and yellow starthistle (Centaurea solstitialis). These four species are a serious problem throughout Oregon and the Pacific Northwest. Stands of knapweed can choke out natural...
Resource Type:: Technical Report
Full Text:: Identification and Control of Knapweed Species in Central and

Creator:: Oregon State University. Extension Service
Abstract:: Knapweeds are a serious problem in Oregon because they vigorously invade disturbed or degraded sites and form dense populations that exclude native and desirable plant communities, causing economic and ecological losses. Their ability to spread rapidly by seeds and roots makes control very difficult. Seeds can remain viable for 5...
Resource Type:: Technical Report
Full Text:: , but they will reinvade the site without follow-up cultural control. Russian knapweed, with its very

Creator:: Oregon State University. Extension Service, Roche, Cindy Talbott, and White, G. R. (George Randolph), 1958-
Abstract:: In the heat of summer in the Rogue Valley, yellow starthistle (Centaurea solstitialis) raises heads of brilliant yellow flowers rigidly defended by sharp spines. Although bees reap double benefits of nectar and pollen during a season when most native plants no longer are flowering, this nonnative weed is a threat...
Resource Type:: Technical Report
Full Text:: changed the mosaic of natural grasslands, oak woodlands, and chaparral. Grazing, logging, fire control

Creator:: Miskella, John
Abstract:: Centaurea solstitialis L. (yellow starthistle) and C. × moncktonii Britt. (meadow knapweed) are members of the genus Centaurea in the Asteraceae family. Both species have become serious management concerns as invasive species in North America, often displacing native vegetation and costing land managers millions of dollars to eradicate. Seven plants...
Resource Type:: Masters Thesis
Full Text:: Between Yellow Starthistle (Centaurea solstitialis) and Meadow Knapweed (Centaurea × moncktonii

ScholarsArchive@OSU