Subject
- Agricultural pests -- Control -- Congresses388
- Apples -- Diseases and pests136
- Pears -- Diseases and pests125
- Report (United States. Forest Service. Northern Region. Insect and Disease Management)63
- Codling moth -- Control57
- Insecticides -- Research55
- Report (United States. Forest Service. Northern Region. Forest Pest Management)48
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley44
- Pesticides -- Application -- Oregon -- Willamette River Valley41
- Douglas fir -- Diseases and pests29
- Pear psylla -- Control28
- Vegetable gardening -- Oregon27
- Strawberries -- Diseases and pests25
- Beans -- Diseases and pests23
- Potatoes -- Diseases and pests21
- Wheat -- Diseases and pests21
- Peach -- Diseases and pests19
- Onions -- Diseases and pests17
- Peppermint -- Diseases and pests17
- Spraying and dusting in agriculture -- Oregon17