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First Report of Phytophthora ramorum Infecting Mistletoe in California

K. L. Riley and G. A. Chastagner

February 2011


In 2005 and 2006, white fir and Douglas-fir growing in a Christmas tree plantation near Los Gatos, CA, under a black walnut tree infected with mistletoe tested positive for Phytophthora ramorum, the cause of Sudden Oak Death. Isolation from a symptomatic mistletoe inflorescence stalk was positive for P. ramorum. In 2007, fresh mistletoe leaves, stems, inflorescence stalks, and berries were inoculated with a zoospore suspension of the mistletoe isolate. All of the plant parts developed symptoms, and P. ramorum was isolated from each of them. This is the first report of an infection of a hemiparasite with P. ramorum.


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