Subject
- Pear -- Diseases and pests -- Control -- Oregon -- Willamette River Valley10
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley8
- Fruit -- Diseases and pests -- Control -- Columbia River Valley7
- Pesticides -- Application -- Columbia River Valley7
- Spraying and dusting in agriculture -- Columbia River Valley7
- Pesticides -- Application -- Oregon -- Willamette River Valley6
- Apples -- Diseases and pests -- Control -- Columbia River Valley5
- Cherry -- Diseases and pests -- Control -- Columbia River Valley5
- Pear -- Diseases and pests -- Control -- Columbia River Valley5
- Pear -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley5
- Apples -- Diseases and pests -- Control -- Oregon -- Willamette River Valley2
- Agricultural pests -- Control -- Congresses1
- Fruit -- Diseases and pests -- Oregon -- Columbia River Valley1
- Insecticides -- Oregon -- Columbia River Valley1
- Meloidogyne -- Control -- Columbia River Watershed1
- Meloidogyne -- Control -- Oregon -- Klamath Basin1
- Meloidogyne -- Control -- San Luis Valley (Colo. and N.M.)1
- Pear -- Diseases and pests -- Integrated control -- Oregon -- Hood River Valley1
- Pears -- Diseases and pests -- Hood River Valley (Or.)1
- Pleocoma -- Control -- Oregon -- Columbia River Valley1