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Hosts and Associated Plants
These plants are naturally infected by P. ramorum, and have had Koch’s postulates completed, documented, reviewed, and accepted. Further details on regulated plants and plant parts can be found at http://www.aphis.usda.gov/plant_health/plant_pest_info/pram/index.shtml
Regulated Hosts (updated Feb 2010)
Common Name
Scientific Name
Alleghany viburnum
Alleghany viburnum
Healthy
| Latin Name |
Viburnum x rhytidophylloides |
| Host Type |
Regulated Host |
| Photo Credits |
The U.S. National Arboretum, USDA |
Viburnum x rhytidophylloides
Alleghany viburnum flowering
Alleghany viburnum flowering
Healthy
| Latin Name |
Viburnum x rhytidophylloides |
| Host Type |
Regulated Host |
| Photo Credits |
The U.S. National Arboretum. USDA |
Viburnum x rhytidophylloides
Alleghany viburnum fruiting
Alleghany viburnum fruiting
Healthy
| Latin Name |
Viburnum x rhytidophylloides |
| Host Type |
Regulated Host |
| Photo Credits |
The U.S. National Arboretum, USDA |
Viburnum x rhytidophylloides
American cranberry viburnum
American cranberry viburnum
Healthy.
Also known as European cranberrybush viburnum
| Latin Name |
Viburnum opulus (=V. trilobum) |
| Host Type |
Regulated Host |
| Photo Credits |
UConn Plant Database (http://www.hort.uconn.edu/plants/index.html) |
Viburnum opulus (=V. trilobum)
Bay laurel (L. nobilis)
Bay laurel (L. nobilis)
Healthy
| Latin Name |
Laurus nobilis |
| Host Type |
Regulated Host |
| Photo Credits |
John Crellin
(www.floralimages.com) |
Laurus nobilis
Big leaf maple
Big leaf maple
Petiole lesion
| Latin Name |
Acer macrophyllum |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Acer macrophyllum
California bay laurel
California bay laurel
| Latin Name |
Umbellularia californica |
| Host Type |
Regulated Host |
| Photo Credits |
Rob Gross |
Umbellularia californica
California black oak
California black oak
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus kelloggii |
| Host Type |
Regulated Host |
Quercus kelloggii
California buckeye
California buckeye
| Latin Name |
Aesculus californica |
| Host Type |
Regulated Host |
| Photo Credits |
Matteo Garbelotto, UC Berkeley |
Aesculus californica
California coffeeberry
California coffeeberry
| Latin Name |
Frangula californica = Rhamnus purshiana |
| Host Type |
Regulated Host |
| Photo Credits |
Djibo Zanzot, UC Davis |
Frangula californica = Rhamnus purshiana
California honeysuckle
California honeysuckle
Infected honeysuckle leaves
| Latin Name |
Lonicera hispidula |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Lonicera hispidula
California maidenhair fern
California maidenhair fern
| Latin Name |
Adiantum jordanii |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Adiantum jordanii
Camphor tree
Camphor tree
May 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Cinnamomum camphora |
| Host Type |
Regulated Host |
Cinnamomum camphora
Canyon live oak
Canyon live oak
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus chrysolepis |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Quercus chrysolepis
Coast live oak
Coast live oak
Canker. Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus agrifolia |
| Host Type |
Regulated Host |
| Photo Credits |
Steve Tjosvold, UC Cooperative Extension |
Quercus agrifolia
Coast redwood
Coast redwood
Redwood tip
| Latin Name |
Sequoia sempervirens |
| Host Type |
Regulated Host |
| Photo Credits |
Matteo Garbelotto, UC Berkeley |
Sequoia sempervirens
Douglas-fir
Douglas-fir
| Latin Name |
Pseudotsuga menziesii var. mienziesii |
| Host Type |
Regulated Host |
| Photo Credits |
Matteo Garbelotto, UC Berkeley; and David Rizzo, UC Davis |
Pseudotsuga menziesii var. mienziesii
European ash
European ash
| Latin Name |
Fraxinus excelsior |
| Host Type |
Regulated Host |
Fraxinus excelsior
European beech
European beech
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Fagus sylvatica |
| Host Type |
Regulated Host |
Fagus sylvatica
European turkey oak
European turkey oak
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus cerris |
| Host Type |
Regulated Host |
Quercus cerris
European yew
European yew
| Latin Name |
Taxus baccata |
| Host Type |
Regulated Host |
| Photo Credits |
Central Science Laboratory, Crown Copyright, United Kingdom |
Taxus baccata
Evergreen huckleberry
Evergreen huckleberry
Shoot dieback
| Latin Name |
Vaccinium ovatum |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Vaccinium ovatum
False solomon's seal
False solomon's seal
| Latin Name |
Maiantheumum racemosum (formerly known as Smilacina racemosa) |
| Host Type |
Regulated Host |
| Photo Credits |
Daniel Huberli, University of California, Berkeley |
Maiantheumum racemosum (formerly known as Smilacina racemosa)
Goat willow
Goat willow
Healthy
| Latin Name |
Salix caprea |
| Host Type |
Regulated Host |
| Photo Credits |
Pat O'Reilly, Wales, UK
(www.fishing-in-wales.com) |
Salix caprea
Griselinia
Griselinia
| Latin Name |
Griselinia littoralis |
| Host Type |
Regulated Host |
| Photo Credits |
UK Central Science Laboratory. |
Griselinia littoralis
Holm oak
Holm oak
Foliar tree branch lesion
| Latin Name |
Quercus ilex |
| Host Type |
Regulated Host |
| Photo Credits |
Sandra Denman, Forestry Commission, United Kingdom |
Quercus ilex
Horse chestnut
Horse chestnut
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Aesculus hippocastanum |
| Host Type |
Regulated Host |
Aesculus hippocastanum
Lilac
Lilac
| Latin Name |
Syringa vulgaris |
| Host Type |
Regulated Host |
| Photo Credits |
Dr. Alexandra Schlenzig, Scottish Agricultural Science Agency |
Syringa vulgaris
Madrone
Madrone
Madrone stem lesion
| Latin Name |
Arbutus menziesii |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Arbutus menziesii
Manzanita (A. manzanita)
Manzanita (A. manzanita)
Feb 06 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Arctostaphylos manzanita (inoculated) |
| Host Type |
Regulated Host |
| Photo Credits |
David Rizzo, UC Davis |
Arctostaphylos manzanita (inoculated)
Mountain laurel
Mountain laurel
| Latin Name |
Kalmia latifolia |
| Host Type |
Regulated Host |
| Photo Credits |
Jennifer Falacy, WSDA |
Kalmia latifolia
Persian ironwood
Persian ironwood
| Latin Name |
Parrotia persica |
| Host Type |
Regulated Host |
Parrotia persica
Pieris
Pieris
| Latin Name |
Pieris spp. |
| Host Type |
Regulated Host |
| Photo Credits |
Ken Peek, Alameda County Dept. of Agriculture |
Pieris spp.
Planetree maple
Planetree maple
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Acer pseudoplatanus |
| Host Type |
Regulated Host |
Acer pseudoplatanus
Red tip or Fraser's photinia
Red tip or Fraser's photinia
Healthy
| Latin Name |
Photinia fraseri |
| Host Type |
Regulated Host |
| Photo Credits |
J.S. Peterson, USDA NRCS NPCD |
Photinia fraseri
Rhododendron
Rhododendron
| Latin Name |
Rhododendron spp. |
| Host Type |
Regulated Host |
| Photo Credits |
Ken Peek, Alameda Dept. of Agriculture |
Rhododendron spp.
Scotch Heather
Scotch Heather
Healthy
| Latin Name |
Calluna vulgaris |
| Host Type |
Regulated Host |
| Photo Credits |
John Crellin
(www.floralimages.com) |
Calluna vulgaris
Shreve's oak
Shreve's oak
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus parvula var. shrevei & all nursery grown Q. parvula |
| Host Type |
Regulated Host |
Quercus parvula var. shrevei & all nursery grown Q. parvula
Southern red oak
Southern red oak
Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Quercus falcata |
| Host Type |
Regulated Host |
| Photo Credits |
Department of Environment Food and Rural Affairs (DEFRA), United Kingdom |
Quercus falcata
Sweet Chestnut
Sweet Chestnut
Leaf lesions
| Latin Name |
Castanea sativa |
| Host Type |
Regulated Host |
| Photo Credits |
Sandra Denman, Forestry Commission, United Kingdom |
Castanea sativa
Tanoak
Tanoak
Canker. Unmanufactured wood and wood products, including firewood, logs, and lumber are regulated. See 7 CFR 301.92.
| Latin Name |
Notholithocarpus densiflorus |
| Host Type |
Regulated Host |
| Photo Credits |
Karl Buermeyer, UC Cooperative Extension |
Notholithocarpus densiflorus
Toyon
Toyon
| Latin Name |
Heteromeles arbutifolia |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Heteromeles arbutifolia
Western maidenhair fern
Western maidenhair fern
| Latin Name |
Adiantum aleuticum |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Adiantum aleuticum
Western starflower
Western starflower
| Latin Name |
Trientalis latifolia |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Trientalis latifolia
Witch hazel
Witch hazel
| Latin Name |
Hamamelis virginiana |
| Host Type |
Regulated Host |
| Photo Credits |
Margaret O'Donnell, Department for Environment, Food and Rural Affairs (DEFRA)
|
Hamamelis virginiana
Wood rose
Wood rose
Stem dieback
| Latin Name |
Rosa gymnocarpa |
| Host Type |
Regulated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Rosa gymnocarpa
Associated Hosts
These plants are found naturally infected, and P. ramorum has been cultured and/or detected using PCR, but Koch’s postulates have not been completed or documented and reviewed.
Common Name
Scientific Name
Andrew's clintonia bead lily
Andrew's clintonia bead lily
May 04 - Reported by David Rizzo, University of California, Davis, CA
| Latin Name |
Clintonia andrewsiana |
| Host Type |
Associated Host |
| Photo Credits |
Jenny Davidson, University of California, Davis |
Clintonia andrewsiana
Anise magnolia
Anise magnolia
Feb 08 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia salicifolia = Magnolia proctoriana |
| Host Type |
Associated Host |
Magnolia salicifolia = Magnolia proctoriana
Ardisia
Ardisia
Jan 06 - Reported by Canadian Food Inspection Agency,Canada (CFIA)
| Latin Name |
Ardisia japonica |
| Host Type |
Associated Host |
| Photo Credits |
Stephan Briere, Centre for Plant Quarantine Pests, Canadian food Inspection Agency |
Ardisia japonica
Banana shrub
Banana shrub
April 08 - Reported by CA Department of Food and Agriculture (CDFA
| Latin Name |
Magnolia (Michelia) figo |
| Host Type |
Associated Host |
| Photo Credits |
Cheryl Blomquist, CDFA |
Magnolia (Michelia) figo
Bayleaf currant
Bayleaf currant
Jan 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Ribes laurifolium |
| Host Type |
Associated Host |
Ribes laurifolium
Bilberry
Bilberry
Feb 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Vaccinium myrtilus |
| Host Type |
Associated Host |
Vaccinium myrtilus
Blueblossom
Blueblossom
April 06 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Ceanothus thyrsiflorus |
| Host Type |
Associated Host |
| Photo Credits |
Matthew DiLeo, University of California, Davis |
Ceanothus thyrsiflorus
Buford holly
Buford holly
| Latin Name |
Ilex cornuta |
| Host Type |
Associated Host |
Ilex cornuta
California hazelnut
California hazelnut
Shoot dieback. Dec 02 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Corylus Cornuta |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Corylus Cornuta
California nutmeg
California nutmeg
Aug 05 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Torreya californica |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Torreya californica
California wood fern
California wood fern
May 04 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Dryopteris arguta |
| Host Type |
Associated Host |
Dryopteris arguta
Castanopsis
Castanopsis
Aug 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Castanopsis orthacantha |
| Host Type |
Associated Host |
Castanopsis orthacantha
Chinese guger tree, needlewood
Chinese guger tree, needlewood
Nov 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Schima wallichii |
| Host Type |
Associated Host |
Schima wallichii
Chinese redbud
Chinese redbud
30 May 2008 Cercis chinense - redbud changed to correctly read Cercis chinensis - Chinese redbud.
April 08 - Reported by Canadian Food Inspection Agency,Canada (CFIA)
| Latin Name |
Cercis chinensis |
| Host Type |
Associated Host |
Cercis chinensis
Chinese witchhazel
Chinese witchhazel
Jan 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Hamamelis mollis |
| Host Type |
Associated Host |
Hamamelis mollis
Cornus Norman Haddon
Cornus Norman Haddon
Aug 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Cornus kousa x Cornus capitata |
| Host Type |
Associated Host |
Cornus kousa x Cornus capitata
Cowberry, Lingon berry, Mountain cranberry
Cowberry, Lingon berry, Mountain cranberry
April 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Vaccinium vitis-idaea |
| Host Type |
Associated Host |
Vaccinium vitis-idaea
Daphniphyllum glaucescens
Daphniphyllum glaucescens
Feb 09 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Daphniphyllum glaucescens |
| Host Type |
Associated Host |
| Photo Credits |
CFIA |
Daphniphyllum glaucescens
Delavay osmanthus, Delavay tea olive
Delavay osmanthus, Delavay tea olive
Tip dieback. Jan 07 - Reported by Washington State Department of Agriculture, Olympia, WA
| Latin Name |
Osmanthus delavayi |
| Host Type |
Associated Host |
| Photo Credits |
Cindy Cooper, WSDA |
Osmanthus delavayi
Drooping leucothoe
Drooping leucothoe
Oct 03 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Leucothoe fontanesiana |
| Host Type |
Associated Host |
| Photo Credits |
Central Science Laboratory, Crown Copyright, United Kingdom |
Leucothoe fontanesiana
Dwarf English laurel
Dwarf English laurel
Jan 07 - Reported by Washington State Department of Agriculture, Olympia, WA
| Latin Name |
Prunus laurocerasus 'Nana' |
| Host Type |
Associated Host |
| Photo Credits |
Cindy Cooper, WSDA |
Prunus laurocerasus 'Nana'
Eastern joy lotus tree
Eastern joy lotus tree
July 06 - Reported by Canadian Food Inspection Agency,Canada (CFIA)
| Latin Name |
Parakmeria lotungensis |
| Host Type |
Associated Host |
Parakmeria lotungensis
English laurel, cherry laurel
English laurel, cherry laurel
Jan 07 - Reported by Washington State Department of Agriculture, Olympia, WA
| Latin Name |
Prunus laurocerasus |
| Host Type |
Associated Host |
Prunus laurocerasus
European holly
European holly
April 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Ilex aquifolium |
| Host Type |
Associated Host |
Ilex aquifolium
Evergreen maple
Evergreen maple
Aug 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Acer laevigatum |
| Host Type |
Associated Host |
| Photo Credits |
Kwekerij Fa. C. Esveld
(http://www.esveld.nl/engels.htm) |
Acer laevigatum
Fetterbush
Fetterbush
AKA Coast leucothoe. Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Leucothoe axillaris |
| Host Type |
Associated Host |
| Photo Credits |
Melissa Main, BC - Coastal Region Operations, Canadian Food Inspection Agency |
Leucothoe axillaris
Formosa firethorn
Formosa firethorn
April 04 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Pyracantha koidzumii |
| Host Type |
Associated Host |
| Photo Credits |
Stephen Briere, Canadian Food Inspection Agency (CFIA) |
Pyracantha koidzumii
Grand fir
Grand fir
June 03 - Reported by CA Department of Food and Agriculture (CDFA)
| Latin Name |
Abies grandis |
| Host Type |
Associated Host |
| Photo Credits |
Santa Clara County Department of Agriculture |
Abies grandis
Grand Fir
Grand Fir
| Latin Name |
Abies grandis |
| Host Type |
Associated Host |
| Photo Credits |
UK Forestry Commission/Forest Research |
Abies grandis
Holly olive
Holly olive
June 06 - Reported by CA Department of Food and Agriculture (CDFA)
| Latin Name |
Osmanthus heterophyllus |
| Host Type |
Associated Host |
Osmanthus heterophyllus
Hybrid roses
Hybrid roses
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Rosa (specific cultivars) |
| Host Type |
Associated Host |
Rosa (specific cultivars)
Hybrid witchhazel
Hybrid witchhazel
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Hamamelis x Intermedia (H. mollis & H. japonica) |
| Host Type |
Associated Host |
Hamamelis x Intermedia (H. mollis & H. japonica)
Japanese evergreen oak
Japanese evergreen oak
May 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Quercus acuta |
| Host Type |
Associated Host |
Quercus acuta
Japanese larch
Japanese larch
Dieback
| Latin Name |
Larix kaempferi |
| Host Type |
Associated Host |
| Photo Credits |
Joan Webber/Clive Brasier, Forest Research, UK |
Larix kaempferi
Japanese oak
Japanese oak
April 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Lithocarpus glaber |
| Host Type |
Associated Host |
Lithocarpus glaber
Kinnikinnik, bearberry
Kinnikinnik, bearberry
Jan 07 - Reported by Washington State Department of Agriculture, Olympia, WA
| Latin Name |
Arctostaphylos uva-ursi |
| Host Type |
Associated Host |
| Photo Credits |
Nathan Lubliner, WSDA |
Arctostaphylos uva-ursi
Kobus magnolia
Kobus magnolia
Feb 08 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Magnolia kobus |
| Host Type |
Associated Host |
Magnolia kobus
Kousa dogwood
Kousa dogwood
Sep 08 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Cornus kousa |
| Host Type |
Associated Host |
| Photo Credits |
CFIA |
Cornus kousa
Lily tree
Lily tree
| Latin Name |
Magnolia denudata |
| Host Type |
Associated Host |
Magnolia denudata
Loebner magnolia
Loebner magnolia
Jan 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia x loebneri |
| Host Type |
Associated Host |
| Photo Credits |
UK Central Science Laboratory |
Magnolia x loebneri
Loropetalum
Loropetalum
July 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Loropetalum chinense |
| Host Type |
Associated Host |
| Photo Credits |
Cheryl Blomquist, CDFA |
Loropetalum chinense
Magnolia
Magnolia
Feb 08 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia x thompsoniana (M. tripetala and M. virginiana) |
| Host Type |
Associated Host |
Magnolia x thompsoniana (M. tripetala and M. virginiana)
Manzanita (A. columbiana)
Manzanita (A. columbiana)
Feb 06 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Arctostaphylos columbiana |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Arctostaphylos columbiana
Mexican orange
Mexican orange
Jan 09 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Choisya ternate |
| Host Type |
Associated Host |
Choisya ternate
Michelia
Michelia
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Magnolia maudiae =Michelia maudiae |
| Host Type |
Associated Host |
Magnolia maudiae =Michelia maudiae
Molinadendron sinaloense
Molinadendron sinaloense
| Latin Name |
Molinadendron sinaloense |
| Host Type |
Associated Host |
| Photo Credits |
Ken Peek, Alameda County Dept. of Agriculture |
Molinadendron sinaloense
Myrtle-leafed Distylium
Myrtle-leafed Distylium
July 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Distylium myricoides |
| Host Type |
Associated Host |
Distylium myricoides
Ninebark
Ninebark
Oct 07 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Physocarpus opulifolius |
| Host Type |
Associated Host |
Physocarpus opulifolius
Northern red oak
Northern red oak
Canker. Nov 03 - Reported by Plant Protection Service, Wageningen, Netherlands
| Latin Name |
Quercus rubra |
| Host Type |
Associated Host |
| Photo Credits |
The Netherlands Plant Protective Service |
Quercus rubra
Oleander
Oleander
June 06 - Reported by CA Department of Food and Agriculture (CDFA)
| Latin Name |
Nerium oleander |
| Host Type |
Associated Host |
Nerium oleander
Oregon ash
Oregon ash
Leaf lesions. Aug 05 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Fraxinus latifolia |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, Uuniversity of California, Davis |
Fraxinus latifolia
Oregon grape
Oregon grape
Aug 07 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Berberis diversifolia=Mahonia aquifolium |
| Host Type |
Associated Host |
| Photo Credits |
CFIA |
Berberis diversifolia=Mahonia aquifolium
Oriental holly
Oriental holly
July 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Ilex purpurea |
| Host Type |
Associated Host |
Ilex purpurea
Osmanthus
Osmanthus
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Osmanthus decorus (= Phillyrea decora; = P. vilmoriniana) |
| Host Type |
Associated Host |
Osmanthus decorus (= Phillyrea decora; = P. vilmoriniana)
Pacific yew
Pacific yew
Wilted shoot tips. May 03 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Taxus brevifolia |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Taxus brevifolia
Poison oak
Poison oak
Dec 02 - Reported by Everett Hansen, Oregon State University (OSU)
| Latin Name |
Toxicodendron diversiloba |
| Host Type |
Associated Host |
| Photo Credits |
Alan Kanaskie, Oregon Department of Forestry |
Toxicodendron diversiloba
Portuguese laurel cherry
Portuguese laurel cherry
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Prunus lusitanica |
| Host Type |
Associated Host |
Prunus lusitanica
Purple magnolia
Purple magnolia
Feb 08 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia liliiflora = Magnolia quinquepeta |
| Host Type |
Associated Host |
Magnolia liliiflora = Magnolia quinquepeta
Red fir
Red fir
Jan 06 - Reported by Gary Chastagner, Washington State University, Puyallup, WA
| Latin Name |
Abies magnifica |
| Host Type |
Associated Host |
Abies magnifica
Red lotus tree
Red lotus tree
Aug 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Manglietia insignis |
| Host Type |
Associated Host |
Manglietia insignis
Redwood ivy
Redwood ivy
Inside-out flower new infections. Aug 05 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Vancouveria planipetala |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Vancouveria planipetala
Roble beech
Roble beech
Dec 04 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Nothofagus obliqua |
| Host Type |
Associated Host |
Nothofagus obliqua
Rugosa rose
Rugosa rose
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Rosa rugosa |
| Host Type |
Associated Host |
Rosa rugosa
Salal, Oregon wintergreen
Salal, Oregon wintergreen
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Gaultheria shallon |
| Host Type |
Associated Host |
Gaultheria shallon
Salmonberry
Salmonberry
Dec 02 - Reported by Everett Hansen, Oregon State University (OSU)
| Latin Name |
Rubus spectabilis |
| Host Type |
Associated Host |
| Photo Credits |
Everett Hansen, Oregon State University |
Rubus spectabilis
Saucer magnolia
Saucer magnolia
Jan 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia x soulangeana |
| Host Type |
Associated Host |
Magnolia x soulangeana
Scribbly gum
Scribbly gum
Aug 06 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Eucalyptus haemastoma |
| Host Type |
Associated Host |
Eucalyptus haemastoma
Sessile oak
Sessile oak
Healthy. Aug 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Quercus petraea |
| Host Type |
Associated Host |
| Photo Credits |
First Nature
(http://www.first-nature.com) |
Quercus petraea
Silk tassel tree, coast silk tassel
Silk tassel tree, coast silk tassel
Aug 07 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Garrya elliptica |
| Host Type |
Associated Host |
Garrya elliptica
Southern magnolia
Southern magnolia
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Magnolia grandiflora |
| Host Type |
Associated Host |
| Photo Credits |
Laura Alber |
Magnolia grandiflora
Spicebush
Spicebush
Leaf necrosis. May 05 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Calycanthus occidentales |
| Host Type |
Associated Host |
| Photo Credits |
John Bienapfl, University of California, Davis |
Calycanthus occidentales
Spike witch hazel
Spike witch hazel
Nov 07 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Corylopsis spicata |
| Host Type |
Associated Host |
Corylopsis spicata
Spiked speedwell
Spiked speedwell
| Latin Name |
Veronica spicata Syn. Pseudolysimachion spicatum |
| Host Type |
Associated Host |
Veronica spicata Syn. Pseudolysimachion spicatum
Spreading euonymus
Spreading euonymus
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Euonymus kiautschovicus |
| Host Type |
Associated Host |
| Photo Credits |
Stephan Briere, Centre for Plant Quarantine Pests, Canadian food Inspection Agency |
Euonymus kiautschovicus
Star jasmine
Star jasmine
Early dehiscence
| Latin Name |
Trachelospermum jasminoides |
| Host Type |
Associated Host |
| Photo Credits |
S. Lewis ODA |
Trachelospermum jasminoides
Star magnolia
Star magnolia
Jan 05 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Magnolia stellata |
| Host Type |
Associated Host |
| Photo Credits |
UK Central Science Laboratory |
Magnolia stellata
Strawberry tree
Strawberry tree
Symptoms on twigs seven days after inoculation with a mycelium plug of Phytophthora ramorum. Dec 02 - Reported by Gary Chastagner, Washington State University, Puyallup, WA
| Latin Name |
Arbutus unedo |
| Host Type |
Associated Host |
| Photo Credits |
E. Moralejo & J. A. García |
Arbutus unedo
Striped bark maple
Striped bark maple
Jan 06 - Reported by Canadian Food Inspection Agency, Canada (CFIA)
| Latin Name |
Acer davidii |
| Host Type |
Associated Host |
Acer davidii
Sweet Cicely
Sweet Cicely
Aug 05 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Osmorhiza berteroi |
| Host Type |
Associated Host |
Osmorhiza berteroi
Sweet olive
Sweet olive
June 06 - Reported by CA Department of Food and Agriculture (CDFA)
| Latin Name |
Osmanthus fragrans |
| Host Type |
Associated Host |
Osmanthus fragrans
Victorian box
Victorian box
Dec 02 - Reported by Matteo Garbelotto, University of California, Berkeley (UCB)
| Latin Name |
Pittosporum undulatum |
| Host Type |
Associated Host |
Pittosporum undulatum
Vine maple
Vine maple
Feb 06 - Reported by David Rizzo, University of California, Davis (UCD)
| Latin Name |
Acer circinatum |
| Host Type |
Associated Host |
| Photo Credits |
Matthew DiLeo, University of California, Davis |
Acer circinatum
White fir
White fir
Oct 05 - Reported by CA Department of Food and Agriculture (CDFA)
| Latin Name |
Abies concolor |
| Host Type |
Associated Host |
| Photo Credits |
Tomas Pastalka, California Department of Food and Agriculture. Associated host |
Abies concolor
Winter's bark
Winter's bark
Healthy. July 04 - Reported by Department for Environment, Food and Rural Affairs, UK (DEFRA); (April 2009) Food and Environment Research Agency (FERA)
| Latin Name |
Drimys winteri |
| Host Type |
Associated Host |
| Photo Credits |
Cal Lemke, Univeristy of Oklahoma, Department of Botany and Microbiology |
Drimys winteri
Yellow anise
Yellow anise
| Latin Name |
Illicium parviflorum |
| Host Type |
Associated Host |
Illicium parviflorum
Yew
Yew
June 05 - Reported by Plant Protection Service, Wageningen, Netherlands
| Latin Name |
Taxus media |
| Host Type |
Associated Host |
| Photo Credits |
Plant Protection Services of the Netherlands |
Taxus media
Other Hosts
These plants are confirmed P. ramorum positive hosts that have not yet been added to the USDA host or associated host list.
Common Name
Scientific Name
Birch
Birch
Bleeding lesion caused by P. ramorum
| Latin Name |
Betula pedula |
| Host Type |
Other Host |
| Photo Credits |
UK Forestry Commission/Forest Research |
Betula pedula
Western Hemlock
Western Hemlock
Top dieback caused by P. ramorum infecting and girdling the tops of the trees
| Latin Name |
Tsuga heterophylla |
| Host Type |
Other Host |
| Photo Credits |
UK Forestry Commission/Forest Research |
Tsuga heterophylla
More Host Plants Lists
USDA-APHIS list of current host & associated plants.
Regulated Forest Hosts
# 30 May 2008 Cercis chinense – redbud changed to correctly read Cercis chinensis – Chinese redbud
