Subject
- Agricultural pests -- Control -- Congresses2,179
- Apples -- Diseases and pests132
- Pears -- Diseases and pests125
- Codling moth -- Control103
- Weeds -- Control88
- Insecticides -- Research86
- Herbicides69
- Pear psylla -- Control45
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley44
- Pesticides -- Application -- Oregon -- Willamette River Valley41
- Vegetable gardening -- Oregon35
- Forest fires -- Prevention and control27
- Herbicides -- Research22
- Weeds -- Control -- Research22
- Apple pandemis -- Control19
- Herbicides -- Oregon19
- Peach -- Diseases and pests17
- Report (United States. Forest Service. Northern Region. Forest Pest Management)17
- Robots -- Control systems17
- Spraying and dusting in agriculture17