Subject
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley44
- Pesticides -- Application -- Oregon -- Willamette River Valley41
- Pear -- Diseases and pests -- Control -- Oregon -- Willamette River Valley10
- Apples -- Diseases and pests -- Control -- Oregon -- Willamette River Valley9
- Blueberries -- Diseases and pests -- Control -- Oregon -- Willamette River Valley8
- Cherry -- Diseases and pests -- Control -- Oregon -- Willamette River Valley8
- Eastern filbert blight -- Control -- Oregon -- Willamette River Valley7
- Hazelnuts -- Diseases and pests -- Control -- Oregon -- Willamette River Valley7
- Walnut -- Diseases and pests -- Control -- Oregon -- Willamette River Valley7
- Cherry -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley6
- Apples -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Eastern filbert blight -- Integrated control -- Oregon -- Willamette River Valley5
- Hazelnuts -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Pear -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Plum -- Diseases and pests -- Control -- Oregon -- Willamette River Valley5
- Walnut -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Agricultural pests -- Control -- Oregon -- Willamette River Valley4
- Fruit -- Diseases and pests -- Oregon -- Willamette River Valley4
- Plum -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley4
- Aphididae -- Biological control -- Oregon -- Willamette River Valley1