State University. Extension Service, O., Goheen, E., Hansen, E., Kanaskie, A., Osterbauer, 1., Parke, J., Pscheidt, J., & Chastagner, G. (2006). Sudden oak death and Phytophthora ramorum : a guide for forest managers, christmas tree growers, and forest-tree nursery operators in Oregon and Washington. : Corvallis, Or. : Extension Service, Oregon State University.