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.View symptoms
We encourage members to remain vigilant and to report any possible sightings of the pathogen via TreeAlert.Find out more