The fungus-like pathogen, Phytophthora pluvialis, was first discovered in Oregon, USA in 2013. It is associated with a variety of species, having been known to affect western hemlock, tanoak, pine and Douglas-fir trees.
In September 2021, the pathogen was found in Cornwall where it was affecting mature western hemlock and Douglas-fir trees. Phytophthora pluvialis is known to cause needle cast, shoot dieback, and lesions on the stem, branches, and roots.
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We encourage members to remain vigilant and to report any possible sightings of the pathogen via TreeAlert.
A demarcated area has been put in place by the Forestry Commission and a Notice to restrict movement on materials capable of spreading the disease will come into force on 27 October.
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