Ramorum Blight

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Rhododendron affected by Ramorum blight. Image: [1]


"Ramorum blight" is a term used to describe a class of diseases caused by the plant pathogen Phytophthora ramorum. [1] Foliar (leafy) hosts typically do not succumb to Ramorum blight; however, foliar hosts can spread Phytophthora ramorum to oak trees. [2] Oak trees impacted by Ramorum blight are susceptible to Sudden Oak Death (SOD).


  1. Marra, RE. 2012. Ramorum blight (sudden oak death) (Phytophthora ramorum). The Connecticut Agricultural Experiment Station.
  2. California Oak Mortality Task Force



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