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Filtering by: Subject Knapweeds -- Control -- Oregon

Knapweeds, Centaurea spp., Acroptilon repens

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
Identification and control of knapweed species in central and eastern Oregon

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