Phytophthora pluvialis (PP) is the latest in a series of diseases and infections attacking trees and plants and there are fears up to 60 per cent of woodland could become infected. Threatened areas include woodland on Dartmoor, near Moretonhampstead and Bovey Tracey, with particular attention being focused on Fingle Woods near Drewsteignton.
In recent years there have been several plant pathogens that have caused concern, including the well-publicised ’ash dieback disease’ that is presenting a number of problems, particularly where infected trees are considered a safety risk.
PP was detected in Cornwall in late 2021 and is described as a fungus-like pathogen that reduces that health and vigour of the host plants. It affects mature Douglas fir and western hemlock.
Infected trees exhibit lesions on the stem and suffer from needle drop and dieback of shoots.
It was first was discovered in Oregon in the Pacific northwest of USA where evergreen and mixed forests are managed for large scale timber production.
The name ’Pluvialis’ or ’pluvial’ translates with the meaning relating to ’abundant rain’ or ’due to the action of rain’ and, as Dartmoor is wet and humid, this is one of the regions of the UK where it could become prevalent.
Douglas fir, western red cedar and western hemlock are grown here in the UK for their high quality timber and can be found in Fingle Woods and other coniferous woodlands around Dartmoor.
A spokesman for the Woodland Trust said: ’As yet, the extent and impact of this disease in this country are unknown so precautions are in place and the Forestry Commission is asking people and those connected to forestry work to be vigilant. They have produced a series of maps showing large areas of Cornwall and Devon and Cornwall are in this area where restrictions apply.’
Controlled felling will be taking place to manage the disease.
Notices put up in woodland areas forbid the movement of any wood, bits of bark and trees (including live trees, felled or fallen trees, fruit, seeds, leaves or foliage) to avoid the spread of PP.
For those who are enjoying the woods for walks and relaxation, there will be a few minor issues to consider when out and about.
Dog walkers are asked to stick to paths and not let their dogs carry sticks to other areas. Cyclists are asked to clean their tyres before entering any new location.
The Forestry Commission is asking people to be aware of this disease and to report symptoms if you see them.
Their spokesman said: ’Perhaps the most reasonable advice to those going for a walk in the woods is to read this poster.’