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Phytophthora ramorum Infects Hazelnut, Vine Maple, Blue Blossom, and Manzanita Species in California

M. V. DiLeo, J. C. Bienapfl, and D. M. Rizzo

January 2008


Phytophthora ramorum was isolated from symptomatic tissue of California hazelnut, vine maple, blue blossom, and two species of manzanita. This is the first report of these plant species as natural hosts of P. ramorum. The native ranges of these new host species overlap considerably with regions that are highly favorable to P. ramorum epidemics. It is unknown how these newly-identified hosts affect the epidemiology of sudden oak death in California ecosystems or the spread of P. ramorum into un-infested areas.


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