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Phytophthora ramorum is the most serious tree disease to have affected our forests.

First published:
25 May 2021
Last updated:


Phytophthora ramorum, or P. ramorum, has presented unprecedented challenges to the:

  • forestry sector
  • land-use sector including agriculture

The impact on larch has been particularly significant. But, it also affects other host species such as Rhododendron and Vaccinium.

You can access the latest:

  • information
  • guidance, and
  • action plan for stakeholders

in our Phytophthora ramorum: management strategy. The aim of the strategy is to manage the spread of the disease. This will minimise the social, environmental and economic impact on our landscapes.

You can find more about the history of the disease and what signs to look out for at: