- A Christmas Tree Grower’s Guide to Phytophthora ramorum (PDF) (COMTF Nov. 2006)
- P. ramorum Guide for Forest Managers, Christmas Tree Growers, and Forest-Tree Nursery Operators (PDF) (OSU Extension April 2006)
- Photo gallery of P. ramorum symptoms on conifers (coming soon)
WSU Puyallup Research & Extension Center
2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated 9/24/2025