EPPO Platform
on PRAs

Revised Rapid Assessment of the need for a detailed Pest Risk Analysis for Phytophthora pseudosyringae


This rapid assessment shows: 

Likelihood of entry is: Likely 

Likelihood of establishment is: Established 

Economic impact is expected to be: Difficult to separate the impact from other Phytophthora spp. with which it appears to be associated, but the impact on trees appears minor in isolation, albeit with some uncertainty. The impact on bilberry and the environment in which it occurs is likely to be locally damaging. 

Endangered area: Woodland and heathland areas of the UK where known natural hosts are present; possibly favoured by the presence of waterways and human activity such as walking, mountain biking, etc. Managed gardens may also be favourable to the pathogen. It is possible that western and coastal areas may be more favourable but this is not proven. 

Risk management: No statutory action is recommended.


  • Phytophthora pseudosyringae


  • Acer macrophyllum
  • Alnus glutinosa
  • Arctostaphylos
  • Carpinus betulus
  • Castanea sativa
  • Fagus sylvatica
  • Malus pumila
  • Nothofagus alpina
  • Nothofagus obliqua
  • Notholithocarpus densiflorus
  • Pieris floribunda
  • Quercus agrifolia
  • Quercus cerris
  • Quercus robur
  • Umbellularia californica
  • Vaccinium myrtillus


Type File Size
Pest Risk Analysis Download 176,88kB

PRA Area

  • United Kingdom