UK Risk Register Details for Phytophthora ramorum

This record was last updated on 20/05/2020

Common Names

  • Ramorum leaf blight
  • Ramorum shoot dieback
  • Rhododendron twig blight
  • Sudden oak death

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

  • show / hide

Common Pathways

  • show / hide
This section is currently being developed as part of the next phase of the Risk Register.

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 5
Spread [1 - 5] 4
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 25
UK Relative Risk Rating [1 - 125] 125

Current Mitigations

  • show / hide

Key mitigation for pest

UK suppression project

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 4
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 16
UK Relative Risk Rating [1 - 125] 80

Proposed Actions

Proposed Actions

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

Country Status Notes
Europe Present
Belgium Present
Switzerland Present
Czech Republic Present under eradication
Germany Present
Denmark Present
Spain Present
Finland Present
France Present
United Kingdom Present (Limited)
Greece Present
Croatia Present
Ireland Present
Lithuania Present
Netherlands Present
Norway Present
Poland Present
Serbia Present
Sweden Present
Slovenia Present
North America Present
Canada Present (Limited)
United States Present (Limited)

Type of Pest

  • Oomycete

Host or Industry at Risk

  • show / hide

Forestry, Broadleaved trees

Major Hosts

  • Acer circinatum Pursh
  • Acer davidii Franch.
  • Acer laevigatum Wall.
  • Acer macrophyllum Pursh
  • Acer pseudoplatanus L.
  • Aesculus hippocastanum L.
  • Arbutus menziesii Pursh
  • Arbutus unedo L.
  • Arctostaphylos manzanita Parry
  • Arctostaphylos uva-ursi (L.) Spreng.
  • Ardisia japonica (Thunb.) Blume
  • Betula pendula Roth
  • Calluna vulgaris (L.) Hull.
  • Calycanthus occidentalis Hook. & Arn.
  • Camellia L.
  • Castanea sativa Mill.
  • Ceanothus thyrsiflorus Esch.
  • Cercis chinensis Bunge
  • Choisya ternata H.B.K.
  • Cornus capitata Wall.
  • Cornus kousa (Buerg.) Hance
  • Corylopsis spicata Sieb. & Zucc.
  • Corylus cornuta Marsh.
  • Drimys winteri J.R. & G.Forst.
  • Eucalyptus haemastoma Sm.
  • Fraxinus excelsior L.
  • Fraxinus latifolia Benth.
  • Garrya elliptica Dougl. Ex Lindl.
  • Gaultheria procumbens L.
  • Gaultheria shallon Pursh
  • Griselinia littoralis Raoul
  • Hamamelis intermedia (H. x intermedia) Rehd.
  • Hamamelis mollis Oliv.
  • Hamamelis virginiana L.
  • Heteromeles arbutifolia (Aiton) M.Roemer
  • Ilex aquifolium L.
  • Ilex latifolia Thunb.
  • Kalmia angustifolia L.
  • Larix Mill.
  • Larix decidua Mill.
  • Larix kaempferi (Lamb.) Carriere
  • Laurus nobilis L.
  • Leucothoe axillaris (Lam.) D.Don
  • Leucothoe fontanesiana (Steud.) Sleumer
  • Lithocarpus densiflorus (Hook. & Arn.) Rehd.
  • Lithocarpus glaber (Thunb.) Nakai
  • Lonicera hispidula Dougl. Ex Torr. & Gray
  • Magnolia acuminata L.
  • Magnolia delavayi Franch.
  • Magnolia denudata Desr.
  • Magnolia grandiflora L.
  • Magnolia kobus Dc.
  • Magnolia salicifolia (Sieb. & Zucc.) Maxim.
  • Magnolia stellata (Sieb. & Zucc.) Maxim.
  • Magnolia x soulangiana Soulange-Bodin
  • Nerium oleander L.
  • Nothofagus obliqua (Mirbel) Oerst./Blume
  • Osmanthus decorus (Boiss. & Bal.) Kasapl.
  • Osmanthus delavayi Franch.
  • Osmanthus fragrans Lour.
  • Osmanthus heterophyllus (Gidon) P.S.Green
  • Parrotia persica (Dc.) C.A.Mey.
  • Photinia fraseri (Photinia x fraseri) Dress
  • Pieris floribunda (Pursh Ex Sims) Benth. & Hook.F.
  • Pieris japonica (Thunb.) D.Don Ex G.Don
  • Pittosporum undulatum Vent.
  • Prunus laurocerasus L.
  • Prunus lusitanica L.
  • Pseudotsuga menziesii var. menziesii (Mirbel) Franco
  • Pyracantha koidzumii (Hayata) Rehd.
  • Quercus L.
  • Quercus acuta Thunb.
  • Quercus agrifolia Nee
  • Quercus cerris L.
  • Quercus chrysolepis Liebm.
  • Quercus falcata Michx.
  • Quercus ilex L.
  • Quercus kelloggii Newb.
  • Quercus petraea (Matt.) Liebl.
  • Quercus phillyraeoides Gray
  • Quercus robur L.
  • Quercus rubra L.
  • Rhododendron L.
  • Rhododendron ponticum L.
  • Ribes laurifolium Jancz.
  • Rosa gymnocarpa Nutt.
  • Rosa rugosa Thunb.
  • Rubus spectabilis Pursh
  • Salix caprea L.
  • Schima argentea Pritzel
  • Schima wallichii (Dc.) Korth./Choisy
  • Sequoia sempervirens (D.Don) Endl.
  • Syringa vulgaris L.
  • Taxus baccata L.
  • Taxus brevifolia Nutt.
  • Taxus x media Rehder
  • Torreya californica Torr.
  • Tsuga heterophylla (Rafin.) Sarg.
  • Umbellularia californica (Hook. & Arn.) Nutt.
  • Vaccinium intermedium (V. X Intermedium) Ruthe
  • Vaccinium myrtillus L.
  • Vaccinium ovatum Pursh
  • Vaccinium vitis-idaea L.
  • Viburnum L.
  • Fagus sylvatica L.
  • Castanopsis orthacantha
  • Adiantum jordani Muell.
  • Clintonia andrewsiana Torr.
  • Distylium myricoides Hemsl.
  • Dryopteris arguta (Kaulfuss) Watt
  • Osmorhiza berteroi DC.
  • Vancouveria planipetala Calloni

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved & Coniferous

Further Information

PRA Availability

EU (2009)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest (for non-EU isolates). Regulated pest free area pest (for EU isolates in other parts of Europe). EPPO A2

Actions Indicated

  • show / hide

Action

Statutory action against findings.

General Comments

Pathogen of larch and other hosts subject to a containment strategy in the UK, reflecting its presence in wider environment/forestry settings in some areas.

Risk Records for this Pest