Subject
- Apples -- Diseases and pests6
- Strawberries -- Diseases and pests6
- Agricultural pests -- Control -- Congresses5
- Beans -- Diseases and pests3
- Cherry -- Diseases and pests3
- Douglas fir -- Diseases and pests3
- Holly -- Diseases and pests3
- Mites3
- Pear -- Diseases and pests3
- Phytoseiidae3
- Aphididae2
- Bark beetles2
- Clover -- Diseases and pests2
- Diptera2
- Douglas fir -- Diseases and pests -- Oregon2
- Fruit -- Diseases and pests2
- Grain -- Diseases and pests2
- Grasses -- Diseases and pests2
- Insects as carriers of plant disease2
- Kidney bean -- Diseases and pests2