Subject
- Douglas fir beetle5
- Leafhoppers5
- Aquatic insects4
- Hemiptera3
- Mites3
- Aphididae2
- Apples -- Diseases and pests2
- Beetles2
- Chironomidae2
- Grain -- Diseases and pests2
- Grasses -- Diseases and pests2
- Insect nematodes2
- Insect-plant relationships2
- Mites as biological pest control agents -- Oregon2
- Pear -- Diseases and pests2
- Senecio -- Biological control2
- Spider mites -- Biological control2
- Strawberries -- Diseases and pests2
- Symphyla2
- Vetch bruchid2