Subject
- Red clover -- Diseases and pests -- Oregon3
- Broomrapes -- Control -- Oregon2
- Burning of land -- Oregon -- Willamette River Valley2
- Crop residue management -- Oregon -- Willamette River Valley2
- Grasses -- Seeds -- Yields -- Oregon -- Willamette River Valley2
- Red clover -- Oregon2
- Red fescue -- Oregon -- Willamette River Valley -- Physiology2
- Alfalfa -- Diseases and pests -- Economic aspects -- Oregon1
- Aphididae -- Oregon1
- Broomrapes -- Oregon1
- Chalcid wasps -- Oregon1
- Cover crops -- Oregon1
- Crops and water -- Oregon1
- Entomopathogenic fungi -- Oregon, Western1
- Host-parasite relationships1
- Hylastinus obscurus -- Control -- Oregon, Western1
- Irrigation scheduling -- Oregon1
- Parasitic plants -- Control -- Oregon1
- Plant regulators -- Foliar application -- Oregon -- Willamette River Valley1
- Plant regulators -- Oregon -- Corvallis1