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- Pesticides -- Application -- Oregon -- Willamette River Valley5
- Plum -- Diseases and pests -- Control -- Oregon -- Willamette River Valley5
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley5
- Plum -- Diseases and pests -- Integrated control -- Oregon -- Willamette River Valley4
- Orchards -- Location -- Oregon, Western1
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