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Journal Article
Brasier CM, Hamm PB, Hansen EM. Cultural characters, protein patterns and unusual mating behaviour of Phytophthora gonapodyides isolates from Britain and North America. Mycological Research [Internet]. 1993 ;97:1287 - 1298. Available from:
Hamm PB, Hansen EM. Identification of Phytophthora spp. known to attack conifers in the Pacific Northwest. Northwest Sci. 1987 ;61:103-109.
Hamm PB, Hansen EM. Improved method for isolating Phytophthora lateralis from soil. Plant disease. 1984 ;68:517-519.
Hansen EM, Hamm PB, Julis AJ, Roth LF. Isolation, incidence and management of Phytophthora in forest tree nurseries in the Pacific Northwest [USA]. Plant Disease Reporter. 1979 ;63:607-611.
Hamm PB, Hansen EM. Pathogenicity of Phytophthora species to Pacific Northwest conifers. European Journal of Forest Pathology [Internet]. 1982 ;12:167–174. Available from:
Hamm PB, Hansen EM. Phytophthora pseudotsugae, a new species causing root rot of Douglas-fir. Can. J. Bot. [Internet]. 1983 ;61:2626–2631. Available from:
Hansen EM, Hamm PB. Survival of Phytophthora lateralis in infected roots of Port Orford cedar. Plant Disease. 1996 ;80:1075–1078.
Hansen EM, Roth LF, Hamm PB, Julis. AJ. Survival, spread, and pathogenicity of Phytophthora spp. on Douglas-fir seedlings planted on forest sites. Phytopathology 70: [Internet]. 1980 ;70:422-425. Available from:
Chastagner GA, Hamm PB, Riley KL. Symptoms and Phytophthora spp. associated with root rot and stem canker of noble fir Christmas trees in the Pacific Northwest. Plant disease [Internet]. 1995 ;79:290–293. Available from:
Hansen EM, Brasier CM, Shaw DS, Hamm PB. The taxonomic structure of Phytophthora megasperma: Evidence for emerging biological species groups. Transactions of the British Mycological Society [Internet]. 1986 ;87:557 - 573. Available from:
Hansen EM, Hamm PB, Roth LF. Testing Port-Orford-cedar for resistance to Phytophthora. Plant Disease. 1989 ;73:791–794.