Subject
- Douglas fir -- Diseases and pests6
- Beans -- Diseases and pests4
- Douglas fir4
- Plant ecology4
- Plant viruses4
- Potatoes -- Diseases and pests4
- Wheat -- Diseases and pests4
- Anisogramma anomala3
- Forest ecology -- Oregon3
- Hops -- Diseases and pests3
- Lichens -- Oregon3
- Mycorrhizas3
- Plant communities3
- Powdery mildew diseases3
- Pseudomonas fluorescens3
- Root rots3
- Stripe rust3
- Verticillium dahliae3
- Agrobacterium2
- Agrobacterium radiobacter2