Skip to main content

Phytophthora pluvialis is a fungal-like pathogen which affects a variety of tree species.

Part of:
First published:
15 December 2021
Last updated:

Species affected by Phytophthora pluvialis include:

  • Western hemlock
  • Douglas fir
  • Tanoak, and
  • pine species (Pinus radiata, Pinus patula and Pinus strobus)

Phytophthora pluvialis has now been found at 17 sites across Wales. These include Gwynedd, Carmarthenshire, Powys, Newport, Monmouthshire, Denbighshire, Conwy and Rhondda Cynon Taf.

See the latest press release on Phytophthora pluvialis in Wales.

This follows several recent findings in England and Scotland.
For further information on England’s findings and response, please visit Phytophthora pluvialis - GOV.UK

For further information on Scotland’s finding and response, please visit Scottish Forestry.

We are currently exploring all options to reduce the spread of the disease. Natural Resources Wales (NRW) are carrying out surveys to understand the size of the outbreak. 

Signs and symptoms

Signs of Phytophthora pluvialis include:

  • needle cast – where needles turn brown and fall off
  • shoot dieback, and
  • lesions on the stem, branches and roots

Forest Research has prepared a symptom guide, which illustrates symptomatic trees.

Reporting

If you suspect a tree of having this disease, report it via the TreeAlert online portal. Give as much information as you can, including the location and the species affected.

Wales Demarcated Area Notice

risk assessment has been carried out by the UK Plant Health Risk Group, which has concluded that Phytophthora pluvialis meets the criteria to be classified as a GB quarantine pest for regulatory purposes.

Wales

To protect Wales against this disease, under powers conferred by The Official Controls (Plant Health and Genetically Modified Organisms) (Wales) Regulations 2020, The Welsh Government will introduce demarcated areas around confirmed outbreak sites. Movement restrictions of material capable of spreading Phytophthora pluvialis have been introduced using Notices.

The demarcated areas across Wales are shown on the Wales Demarcated Area map.

Crychan

Demarcated Area 2 came into force on 22 April 2022. The demarcated area applies to an area around Crychan, Carmarthenshire. The boundaries are shown on the Demarcated Area map. The Notice provides a description of the boundary.

Powys

Demarcated Area 3 came into force on 22 April 2022. The demarcated area applies to an area around Radnor, Powys and the boundaries are shown on the Demarcated Area map. The Notice provides a description of the boundary.

Gwynedd

Demarcated Area 5 came into force on 21 April 2022, replacing Demarcated Area 1 (Demarcated Area map) which was issued on 14 March 2022. The demarcated area applies to an area around Dyfi, Gwynedd and the boundaries are shown on the Demarcated area map. The Notice provides a description of the boundary.

South East Wales

Demarcated Area 6 came into force on 21 April 2022, replacing Demarcated Area 4 (Demarcated Area map) which was issued on 14 March 2022. The demarcated area applies to an area around Monmouthshire, Newport, Torfaen, Powys, Blaenau Gwent, Merthyr Tydfil, Rhondda Cynon Taf, Cardiff, Caerphilly, Bridgend and Neath Port Talbot and the boundaries are shown on the Demarcated area map. The Notice provides a description of the boundary. Corresponding Demarcated Area Notices on Gov.uk have been issued in England for this outbreak site, applying to parts of Herefordshire and Gloucestershire.

Carmarthenshire

Demarcated Area 7 came into force on 21 April 2022. The demarcated area applies to an area around Carmarthenshire and the boundaries are shown on the Demarcated area map. The Notice provides a description of the boundary.

The notices prohibit the movement of any relevant susceptible material out of or within the demarcated area specified, unless authorised in writing by a Plant Health Inspector.

The notices include an additional restriction on the felling of susceptible material within the demarcated areas, unless the Forestry Commission has been notified in writing in advance.

List of authorised processors for Phytophthora pluvialis on Gov.UK

For enquiries please contact: treehealth@cyfoethnaturiolcymru.gov.uk

Movement Authorisations will be issued by Forestry Commission so applicants need to e-mail ppluvialis.authorisation@forestrycommission.gov.uk to request authorisation.

Landowners are reminded that to fell material a felling licence is required. For enquiries please contact fellinglicence@cyfoethnaturiolcymru.gov.uk. Landowners must provide notice of their intention to fell relevant material. This must be at least 14 days in advance of any felling in the demarcated areas. Felling may only commence once written authorisation is provided by the Forestry Commission. For all enquiries please contact: ppluvialis.authorisation@forestrycommission.gov.uk