Subject
- Agricultural pests -- Control -- Oregon -- Willamette River Valley4
- Aphididae -- Biological control -- Oregon -- Willamette River Valley1
- Aphididae -- Predators of -- Oregon -- Willamette River Valley1
- Apples -- Diseases and pests -- Control -- Oregon -- Willamette River Valley9
- Apples -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Beneficial insects -- Habitat -- Oregon -- Willamette River Valley1
- Berries -- Diseases and pests -- Biological control -- Oregon -- Willamette River Valley1
- Blueberries -- Diseases and pests -- Control -- Oregon -- Willamette River Valley8
- Blueberries -- Mulching -- Oregon -- Willamette River Valley1
- Brassica -- Diseases and pests -- Oregon -- Willamette River Valley1
- Broccoli -- Diseases and pests -- Biological control -- Oregon -- Willamette River Valley1
- Burning of land -- Oregon -- Willamette River Valley1
- Cabbage maggot -- Control -- Oregon -- Willamette River Valley1
- Cherry -- Diseases and pests -- Control -- Oregon -- Willamette River Valley8
- Cherry -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley6
- Corn root rot -- Oregon -- Willamette River Valley1
- Cotoneasters -- Diseases and pests -- Control -- Oregon -- Willamette River Valley1
- Cover crops -- Oregon -- Willamette River Valley1
- Eastern filbert blight -- Control -- Oregon -- Willamette River Valley7
- Eastern filbert blight -- Genetic aspects -- Oregon -- Willamette River Valley1