Subject
- Agricultural pests -- Control -- Congresses75
- Spraying and dusting in agriculture -- Oregon7
- Fruit trees -- Diseases and pests -- Control4
- Nut trees -- Diseases and pests -- Control4
- Spraying and dusting in agriculture4
- Apples -- Diseases and pests -- Oregon3
- Hazelnuts -- Diseases and pests -- Oregon3
- Strawberries -- Diseases and pests -- Oregon3
- Walnut -- Diseases and pests -- Oregon3
- Apple-maggot -- Oregon2
- Fungicides -- Oregon2
- Grain -- Diseases and pests -- Oregon2
- Grapes -- Diseases and pests -- Control -- Oregon2
- Grasses -- Diseases and pests -- Oregon2
- Honeybee -- Northwest, Pacific2
- Insecticides -- Research2
- Peppermint -- Diseases and pests2
- Peppermint -- Diseases and pests -- Northwest, Pacific2
- Pesticides -- Application -- Oregon2
- Pollination -- Northwest, Pacific2