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Rapid Pest Risk Analysis (PRA) for: Phytophthora pluvialis, updated autumn 2022


This rapid PRA has been undertaken following a finding of the Oomycete pathogen Phytophthora pluvialis in Cornwall in September 2021. Subsequently, additional findings have been made elsewhere in England, also in Scotland and Wales on western hemlock and Douglas fir but not in Northern Ireland. Prior to the UK detections P. pluvialis was only known to be present in New Zealand and the Pacific Northwest (PNW) of the USA. In New Zealand it causes a disease known as red needle cast, primarily on radiata pine and Douglas fir, causing premature needle loss and loss of increment growth but trees recover. In the PNW it causes very minor damage on Douglas fir or tanoak and is considered part of the native forest mycota. This autumn 2022 version of the PRA has been updated as new information has become available.


  • Phytophthora pluvialis


  • Notholithocarpus densiflorus
  • Pinus patula
  • Pinus pinea
  • Pinus radiata
  • Pinus strobus
  • Pseudotsuga menziesii
  • Tsuga heterophylla


Type File Size
Pest Risk Analysis Download 1,45MB

PRA Area

  • United Kingdom