WSU Puyallup
Ornamental Plant Pathology
For Christmas Tree Growers and Forest Managers
- A Christmas Tree Grower’s Guide to Phytophthora ramorum (COMTF Nov. 2006)
- P. ramorum Guide for Forest Managers, Christmas Tree Growers, and Forest-Tree Nursery Operators (OSU Extension April 2006)
- Photo gallery of P. ramorum symptoms on conifers (under construction)