Subject
- Knapweeds -- Control -- Oregon2
- Noxious weeds -- Control -- Oregon2
- Centaurea -- Hybridization -- Oregon1
- Cochylidae1
- Curculionidae1
- Insects as biological pest control agents1
- Knapweeds -- Control1
- Knapweeds -- Control -- Northwestern States1
- Knapweeds -- Control -- Oregon -- Rogue River Valley (Klamath County-Curry County)1
- Knapweeds -- Hybridization -- Oregon1
- Knapweeds -- Identification -- Oregon1
- Noxious weeds -- Hybridization -- Oregon1
- Spotted knapweed -- Biological control1
- Yellow starthistle -- Hybridization -- Oregon1