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Hadfield, J, Douglas B.  1982.  Protection of Douglas-fir Christmas trees from Swiss needle cast in Oregon. American Christmas Tree Journal. 26:31-33. Download: PDF (4.84 MB)
Holm, F.  1944.  The Swiss leaf-cast of Douglas-fir (Douglasiens Sodskimmel). Dansk Skovforeningens Tidsskrift. 25(11)
Hood, IA.  1982.  Phaeocryptopus gaeumannii on Pseudotsuga menziesii in southern British Columbia. New Zealand Journal of Forest Science. 12:415-424.
Hood, IA.  1977.  Inoculation experiments with Phaeocryptopus gaeumannii on Douglas-fir seedlings. New Zealand Journal of Forest Science. 7:77-82.
Hood, IA.  1997.  Swiss needle cast. Compendium of Conifer Diseases. :55-56.
Hood, IA, Kershaw DJ.  1975.  Distribution and infection period of Phaeocryptopus gaeumannii in New Zealand. New Zealand Journal of Forest Science. 5:201-208.