Subject
- Agricultural pests -- Control -- Congresses91
- Grass seed industry -- Oregon10
- Grasses -- Seeds -- Research -- Oregon9
- Seed industry and trade -- Oregon9
- Seed technology -- Oregon9
- Seeds -- Research -- Oregon9
- Weeds -- Control8
- Herbicides7
- Agriculture -- Oregon6
- Agriculture5
- Douglas fir beetle5
- Dissertations, Academic -- United States -- Bibliography -- Catalogs4
- Agriculture -- Oregon -- Experimentation3
- Baculoviruses3
- Bark beetles3
- Beetles -- Northwest, Pacific3
- Douglas fir -- Diseases and pests3
- Forest ecology -- West (U.S.)3
- Forest products -- Bibliography3
- Forest products -- Research -- Oregon3