Phytophthora ramorum detected in Abies grandis in California (US)
In 2003 and 2005, Phytophthora ramorum (EPPO Alert List) was detected on Abies grandis (grand fir) in a Christmas tree plantation near Los Gatos in California (US), in association with infected Umbellularia californica (Californian bay laurel). Inoculation studies demonstrated that A. grandis can be a host of P. ramorum, however the potential for A. grandis to be infected within its native range (Northwestern USA) is unknown.
Riley KL, Chastagner GA, Blomquist C (2010) First report of Phytophthora ramorum infecting grand fir in California. Plant Health Progress April 2011 (public summary). http://www.plantmanagementnetwork.org/php/elements/sum.aspx?id=9437;photo=5278