EPPO Global Database

Phytophthora ramorum(PHYTRA)

Hosts

Categories have been assigned by the EPPO Secretariat on the basis of available data at the time of entry. They correspond to an evaluation of the biological importance of the host plant for the pest concerned, together with the economic importance of this plant for the EPPO region. These categories do not reflect the complexity of the associations that may exist between a host plant and a pest, nor result from exhaustive literature reviews. Further explanation of categories is available in the guide.
Organism Type
Kalmia (1KAMG) Major
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Kalmia latifolia (KAMLA) Major
* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12. Grünwald NJ, LeBoldus JM & Hamelin RC (2019) Ecology and evolution of the sudden oak death pathogen Phytophthora ramorum. Annual Review of Phytopathology 57, 301-321.
Larix decidua (LAXDE) Major
* Grünwald NJ, LeBoldus JM & Hamelin RC (2019) Ecology and evolution of the sudden oak death pathogen Phytophthora ramorum. Annual Review of Phytopathology 57, 301-321.
Larix kaempferi (LAXLE) Major
* Webber JF, Mullet M & Brasier CM (2010) Dieback and mortality of plantation Japanese larch (Larix kaempferi) associated with infection by Phytophthora ramorum. New Disease Reports 22, 19.
Notholithocarpus densiflorus (LIADF) Major
* Garbelotto M, Svihra P & Rizzo D (2001) New pests and diseases: sudden oak death syndrome fells 3 oak species. California Agriculture 55(1), 9-19.

* Søndreli KL, Kanaskie A, Keriö S, LeBoldus JM (2019) Variation in susceptibility of Tanoak to the NA1 and EU1 lineages of Phytophthora ramorum, the Cause of Sudden Oak Death. Plant Disease 103:12, 3154-3160
------- Confirmed host.
Pieris (1PIRG) Major
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf

* Grünwald NJ, LeBoldus JM & Hamelin RC (2019) Ecology and evolution of the sudden oak death pathogen Phytophthora ramorum. Annual Review of Phytopathology 57,  301-321.

* Trippe A, Berghauer E & Osterbauer N (2008) A high troughput system for the detection of Phytophthora ramorum in susceptible plant species: a preliminary report. In: Frankel SJ, Kliejunas JT & Palmieri KM (2008) Proceedings of the Sudden Oak Death Third Symposium, General Technical Report PSW-GTR-214. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 214, 427-434.
Quercus agrifolia (QUEAG) Major
* Garbelotto M, Svihra P & Rizzo D (2001) New pests and diseases: sudden oak death syndrome fells 3 oak species. California Agriculture 55(1), 9-19.
Rhododendron (1RHOG) Major
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* Grünwald NJ, LeBoldus JM & Hamelin RC (2019) Ecology and evolution of the sudden oak death pathogen Phytophthora ramorum. Annual Review of Phytopathology 57: 301-321.

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.

* Trippe A, Berghauer E & Osterbauer N (2008) A high troughput system for the detection of Phytophthora ramorum in susceptible plant species: a preliminary report. In: Frankel SJ, Kliejunas JT & Palmieri KM (2008) Proceedings of the Sudden Oak Death Third Symposium, General Technical Report PSW-GTR-214. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 214, 427-434. 

*USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf

* Werres S, Marwitz R, Man in’t Veld WA, De Cock AWAM, Bonants PJM, De Weerdt M, Themann K, Ilieva E & Baayen RP (2001) Phytophthora ramorum sp. nov., a new pathogen on Rhododendron and Viburnum. Mycological Research 105(10), 1155-1165.
Syringa vulgaris (SYRVU) Major
* Beales PA, Schlenzig A & Inman AJ (2004) First report of ramorum bud and leaf blight (Phytophthora ramorum) on Syringa vulgaris in the UK. Plant Pathology 53(4), 525.
Viburnum (1VIBG) Major
* Grünwald NJ, LeBoldus JM & Hamelin RC (2019) Ecology and evolution of the sudden oak death pathogen Phytophthora ramorum. Annual Review of Phytopathology 57: 301-321.

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602. 

* Trippe A, Berghauer E & Osterbauer N (2008) A high troughput system for the detection of Phytophthora ramorum in susceptible plant species: a preliminary report. In: Frankel SJ, Kliejunas JT & Palmieri KM (2008) Proceedings of the Sudden Oak Death Third Symposium, General Technical Report PSW-GTR-214. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 214, 427-434. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf

* Werres S, Marwitz R, Man in’t Veld WA, De Cock AWAM, Bonants PJM, De Weerdt M, Themann K, Ilieva E & Baayen RP (2001) Phytophthora ramorum sp. nov., a new pathogen on Rhododendron and Viburnum. Mycological Research 105(10), 1155-1165.
Abies alba (ABIAL) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Abies concolor (ABICO) Minor
* Trippe A, Berghauer E & Osterbauer N (2008) A high troughput system for the detection of Phytophthora ramorum in susceptible plant species: a preliminary report. In: Frankel SJ, Kliejunas JT & Palmieri KM (2008) Proceedings of the Sudden Oak Death Third Symposium, General Technical Report PSW-GTR-214. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 214, 427-434.
Abies grandis (ABIGR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.

* Riley KL, Chastagner GA & Blomquist C (2011) First report of Phytophthora ramorum infecting grand fir in California. Plant Health Progress 12(1), 37.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Abies magnifica (ABIMA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* Chastagner GA & Riley KL (2010) First report of Phytophthora ramorum infecting California red fir in California. Plant Disease 94(9), 1170. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Abies procera (ABIPR) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Acer circinatum (ACRCJ) Minor
* DiLeo MV, Bienapfl JC & Rizzo DM (2008) Phytophthora ramorum infects hazelnut, vine maple, blue blossom, and Manzanita species in California. Plant Health Progress 9(1), 50.
Acer davidii (ACRDA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Acer laevigatum (ACRLA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Acer macrophyllum (ACRMA) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184: 733-740.
Acer pseudoplatanus (ACRPP) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Adiantum aleuticum (ADIAL) Minor
* Vettraino AM, Hüberli D, Swain S, Bienapfl JC, Smith A & Garbelotto M (2006) First report of infection of maiden-hair fern (Adiantum jordanii and A. aleuticum) by Phytophthora ramorum in California. Plant Disease 90(3), p 379.
Adiantum jordanii (ADIJO) Minor
* Vettraino AM, Hüberli D, Swain S, Bienapfl JC, Smith A & Garbelotto M (2006) First report of infection of maiden-hair fern (Adiantum jordanii and A. aleuticum) by Phytophthora ramorum in California. Plant Disease 90(3), p 379.
Aesculus californica (AECCA) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184: 733-740.
Aesculus hippocastanum (AECHI) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Alnus cordata (ALUCO) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Arbutus menziesii (ARDME) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Arbutus unedo (ARDUN) Minor
* Moralejo E, Belbahri L, Calmin G, García-Munoz JA, Lefort F & Descals E (2008) Strawberry tree blight in Spain, a new disease caused by various Phytophthora species. Journal of Phytopathology 156(10),  577-587.
Arctostaphylos canescens (ARYCA) Minor
* Rooney-Latham S, Blomquist CL, Williams A, Gunnison E & Pastalka T (2017) Identification of five new hosts of Phytophthora ramorum in an infested forest in California. In: Proceedings of the Sudden Oak Death Sixth Science Symposium, General Technical Report PSW-GTR-255. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 255: 83-84.
Arctostaphylos columbiana (ARYCO) Minor
* DiLeo MV, Bienapfl JC & Rizzo DM (2008) Phytophthora ramorum infects hazelnut, vine maple, blue blossom, and Manzanita species in California. Plant Health Progress 9(1), 50.
Arctostaphylos glauca (ARYGL) Minor
* Rooney-Latham S, Blomquist CL, Soriano MC, Uhler M (2020) First report of Phytophthora ramorum causing foliar and stem blight of two California native Arctostaphylos species, A. viridissima and A. glauca. Plant Disease. https://doi.org/10.1094/PDIS-07-19-1359-PDN
------- confirmed host.
Arctostaphylos manzanita (ARYMA) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Arctostaphylos sensitiva (ARYSE) Minor
* Rooney-Latham S, Blomquist CL, Williams A, Gunnison E & Pastalka T (2017) Identification of five new hosts of Phytophthora ramorum in an infested forest in California. In: Proceedings of the Sudden Oak Death Sixth Science Symposium, General Technical Report PSW-GTR-255. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 255, 83-84.
Arctostaphylos uva-ursi (ARYUU) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Arctostaphylos virgata (ARYVR) Minor
* Rooney-Latham S, Blomquist CL, Williams A, Gunnison E & Pastalka T (2017) Identification of five new hosts of Phytophthora ramorum in an infested forest in California. In: Proceedings of the Sudden Oak Death Sixth Science Symposium, General Technical Report PSW-GTR-255. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 255, 83-84.
Arctostaphylos viridissima (ARYVD) Minor
* Rooney-Latham S, Blomquist CL, Soriano MC & Uhler M (2020) First report of Phytophthora ramorum causing foliar and stem blight of two California native Arctostaphylos species, A. viridissima and A. glauca. Plant Disease. https://doi.org/10.1094/PDIS-07-19-1359-PDN
Ardisia japonica (ADAJA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Berberis aquifolium (MAHAQ) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Betula pendula (BETPE) Minor
* Webber JF, Mullet M & Brasier CM (2010) Dieback and mortality of plantation Japanese larch (Larix kaempferi) associated with infection by Phytophthora ramorum. New Disease Reports 22, 19.
Calluna vulgaris (CUNVU) Minor
* Orlikowski LB & Szkuta G (2004) First notice of Phytophthora ramorum on Calluna vulgaris, Photinia fraseri and Pieris japonica in Polish container-ornamental nurseries. Phytopathologica Polonica 34, 87-92.
Calycanthus occidentalis (CALOC) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Camellia (1CAHG) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Camellia japonica (CAHJA) Minor
* Varela CP, Vázquez JM & Casal OA (2003) First report of Phytophthora ramorum on Camellia japonica in Spain. Plant Disease 87(11), 1396.
Camellia sasanqua (CAHSQ) Minor
* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12.
Castanea sativa (CSNSA) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Castanopsis orthacantha (CSOOR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Ceanothus thyrsiflorus (CEATH) Minor
* DiLeo MV, Bienapfl JC & Rizzo DM (2008) Phytophthora ramorum infects hazelnut, vine maple, blue blossom, and Manzanita species in California. Plant Health Progress 9(1), 50.
Cercis chinensis (CCSCH) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Chamaecyparis lawsoniana (CHCLA) Minor
* Brasier C & Webber JF (2012) Natural stem infection of Lawson cypress (Chamaecyparis lawsoniana) caused by Phytophthora ramorum. New Disease Report 25, 26.
Choisya (1COAG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Choisya ternata (COATE) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Chrysolepis chrysophylla (CSOCH) Minor
* Rooney-Latham S, Blomquist CL, Williams A, Gunnison E & Pastalka T (2017) Identification of five new hosts of Phytophthora ramorum in an infested forest in California. In: Proceedings of the Sudden Oak Death Sixth Science Symposium, General Technical Report PSW-GTR-255. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 255, 83-84.
Cinnamomum camphora (CINCA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf 

* Rooney-Latham S, Honeycutt E, Ochoa J, Grünwald NJ & Blomquist CL (2013) First report of camphor tree (Cinnamomum camphora) as a host of Phytophthora ramorum. Plant Disease 97(10), 1377.
Clintonia andrewsiana (CJXAN) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Cornus capitata (CRWCP) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Cornus hybrids (CRWHY) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 
------- Cornus kousa x capitata.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
------- Cornus kousa x capitata.
Cornus kousa (CRWKO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Corylopsis spicata (CYVSP) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Corylus cornuta (CYLCR) Minor
* DiLeo MV, Bienapfl JC & Rizzo DM (2008) Phytophthora ramorum infects hazelnut, vine maple, blue blossom, and Manzanita species in California. Plant Health Progress 9(1), 50.
Cryptomeria (1CMYG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Daphniphyllum glaucescens (DPLGL) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Distylium myricoides (DSYMY) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Drimys winteri (DRIWI) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Dryopteris arguta (DYOAR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Eucalyptus haemastoma (EUCHS) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Euonymus kiautschovicus (EUOKI) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Fagus sylvatica (FAUSY) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Frangula californica (RHACA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.

* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Frangula purshiana (RHAPU) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.

* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12.
Fraxinus excelsior (FRXEX) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Fraxinus latifolia (FRXLA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Garrya elliptica (GAREL) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Gaultheria procumbens (GAHPR) Minor
* Osterbauer NK, Lane S & Trippe A (2014) Phytophthora ramorum identified infecting Eastern teaberry (Gaultheria procumbens) plants shipped to Oregon. Plant Health Progress 15(1), 9-10.
Gaultheria shallon (GAHSH) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.

* Trippe A, Berghauer E & Osterbauer N (2008) A high troughput system for the detection of Phytophthora ramorum in susceptible plant species: a preliminary report. In: Frankel SJ, Kliejunas JT & Palmieri KM (2008) Proceedings of the Sudden Oak Death Third Symposium, General Technical Report PSW-GTR-214. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 214, 427-434.
Griselinia littoralis (GRSLI) Minor
* Giltrap PM, Hughes KJD, Barton VC, Hobden E, Barber P & Izzard K (2007) Phytophthora ramorum on three new hosts detected using on-site diagnostics. Plant Pathology 56(4), 728.
Hamamelis mollis (HAMMO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Hamamelis virginiana (HAMVI) Minor
* Giltrap PM, Inman AJ, Barton VC, Barnes AV, Lane CR, Hughes KJD, Tomlinson J, Dean ML & Izzard K (2004) First report of ramorum dieback (Phytophthora ramorum) on Hamamelis virginiana in the UK. Plant Pathology 53(4), 526.
Hamamelis x intermedia (HAMIN) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Heteromeles arbutifolia (PHNAR) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184: 733-740.
Ilex aquifolium (ILEAQ) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Ilex chinensis (ILECH) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Ilex latifolia (ILELF) Minor
* Australian Department of Agriculture and Water Resources (2015) Final review of policy: importation of Phytophthora ramorum host propagative material into Australia. CC BY 3.0., 103 pp. https://www.agriculture.gov.au/sites/default/files/sitecollectiondocuments/biosecurity/risk-analysis/propagative-material-final.pdf
Kalmia angustifolia (KAMAN) Minor
* Sansford, CE, Inman, AJ, Baker, R, Brasier, C, Frankel, S, de Gruyter, J, Husson, C, Kehlenbeck, H, Kessel, G, Moralejo, E, Steeghs, M, Webber, J & Werres, S (2009) Report on the risk of entry, establishment, spread and socio-economic loss and environmental impact and the appropriate level of management for Phytophthora ramorum for the EU. EU Sixth Framework Project RAPRA, Deliverable Report 28.
Laurus nobilis (LURNO) Minor
* Harnik TY, Mejia-Chang M, Lewis J & Garbelotto M (2004) Efficacy of heat-based treatments in eliminating the recovery of the sudden oak death pathogen (Phytophthora ramorum) from infected California bay laurel leaves. HortScience 39(7), 1677-1680.
Leucothoe axillaris (LUTAX) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Leucothoe fontanesiana (LUTFO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Lithocarpus glaber (LIAGL) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Lonicera hispidula (LONHS) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Loropetalum chinense (LORCH) Minor
* Blomquist CL, Rooney-Latham S, Soriano MC & McCarty JC (2012) First report of Phytophthora ramorum causing a leafspot on Loropetalum chinense, Chinese fringe flower in California. Plant Disease 96(12), 1829.

* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia (1MAGG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
------- Magnolia denudata x salicifolia
Magnolia acuminata (MAGAC) Minor
* Australian Department of Agriculture and Water Resources (2015) Final review of policy: importation of Phytophthora ramorum host propagative material into Australia. CC BY 3.0., 103 pp. https://www.agriculture.gov.au/sites/default/files/sitecollectiondocuments/biosecurity/risk-analysis/propagative-material-final.pdf
Magnolia cavaleriei (MAGKA) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia delavayi (MAGDE) Minor
* Australian Department of Agriculture and Water Resources (2015) Final review of policy: importation of Phytophthora ramorum host propagative material into Australia. CC BY 3.0., 103 pp. https://www.agriculture.gov.au/sites/default/files/sitecollectiondocuments/biosecurity/risk-analysis/propagative-material-final.pdf
Magnolia denudata (MAGDN) Minor
* Sansford, CE, Inman, AJ, Baker, R, Brasier, C, Frankel, S, de Gruyter, J, Husson, C, Kehlenbeck, H, Kessel, G, Moralejo, E, Steeghs, M, Webber, J & Werres, S (2009) Report on the risk of entry, establishment, spread and socio-economic loss and environmental impact and the appropriate level of management for Phytophthora ramorum for the EU’, EU Sixth Framework Project RAPRA, Deliverable Report 28.
Magnolia doltsopa (MIADO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Magnolia figo (MIAVI) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia foveolata (MAGFO) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia grandiflora (MAGGR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Magnolia insignis (MGTIN) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia kobus (MAGKO) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia liliiflora (MAGLI) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia lotungensis (MAGLT) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Magnolia maudiae (MAGMD) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Magnolia salicifolia (MAGSA) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia stellata (MAGST) Minor
* Giltrap PM, Hughes KJD, Barton VC, Hobden E, Barber P & Izzard K (2007) Phytophthora ramorum on three new hosts detected using on-site diagnostics. Plant Pathology 56(4), 728.
Magnolia wilsonii (MAGWI) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Magnolia x loebneri (MAGLO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* Giltrap PM, Hughes KJD, Barton VC, Hobden E, Barber P & Izzard K (2007) Phytophthora ramorum on three new hosts detected using on-site diagnostics. Plant Pathology 56(4), 728. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Magnolia x soulangeana (MAGSO) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Magnolia x thompsoniana (MAGTH) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Maianthemum racemosum (SMLRA) Minor
* Hüberli D, Ivors KL, Smith A, Tse JG & Garbelotto M (2005) First report of foliar infection of Maianthemum racemosum by Phytophthora ramorum. Plant Disease 89(2), 204.
Nerium oleander (NEROL) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Nothofagus obliqua (NOFOB) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Osmanthus (1OSUG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Osmanthus decorus (OSUDC) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Osmanthus delavayi (OSUDE) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Osmanthus fragrans (OSUFR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* Grünwald NJ, Goss EM, Larsen MM, Press CM, McDonald VT, Blomquist CL & Thomas SL (2008) First report of the European lineage of Phytophthora ramorum on Viburnum and Osmanthus spp. in a California nursery. Plant Disease 92(2), 314.
Osmanthus heterophyllus (OSUHE) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* Grünwald NJ, Goss EM, Larsen MM, Press CM, McDonald VT, Blomquist CL & Thomas SL (2008) First report of the European lineage of Phytophthora ramorum on Viburnum and Osmanthus spp. in a California nursery. Plant Disease 92(2), 314.
Osmorhiza berteroi (OMRBE) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Parrotia persica (PTTPE) Minor
* Hughes KJD, Giltrap PM, Barton VC, Hobden E, Tomlinson JA & Barber P (2006) On-site Real-time PCR detection of Phytophthora ramorum causing dieback of Parrotia persica in the UK. Plant Pathology 55(6), 813.
Photinia x fraseri (PHNFR) Minor
* Orlikowski LB & Szkuta G (2004) First notice of Phytophthora ramorum on Calluna vulgaris, Photinia fraseri and Pieris japonica in Polish container-ornamental nurseries. Phytopathologica Polonica 34: 87-92.
Physocarpus opulifolius (PHPOP) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Picea sitchensis (PIESI) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Pickeringia montana (QKRMO) Minor
* Rooney-Latham S, Blomquist CL, Williams A, Gunnison E & Pastalka T (2017) Identification of five new hosts of Phytophthora ramorum in an infested forest in California. In: Proceedings of the Sudden Oak Death Sixth Science Symposium, General Technical Report PSW-GTR-255. US Department of Agriculture, Forest Service, Pacific Southwest Research Station 255: 83-84.
Pieris formosa (PIRFO) Minor
* Inman AJ, Townend VC, Barnes AV, Lane CR, Hughes KJD, Griffin RL & Eales SJ (2003) First report of ramorum dieback (Phytophthora ramorum) on Pieris in England. Plant Pathology 52, 785.
Pieris hybrids (PIRHY) Minor
* Parke JL, Linderman RG, Osterbauer NK & Griesbach JA (2004) Detection of Phytophthora ramorum blight in Oregon nurseries and completion of Koch’s postulates on Pieris, Rhododendron, Viburnum, and Camellia. Plant Disease 88(1), 87.
------- Pieris floribunda x japonica and Pieris japonica x formosana.
Pieris japonica (PIRJA) Minor
* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12.
Pittosporum undulatum (PTUUN) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Prunus laurocerasus (PRNLR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Prunus lusitanica (PRNLU) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Pseudotsuga menziesii (PSTME) Minor
* Garbelotto M & Rizzo DM (2002) Report on coast redwood and Douglas-fir as host for Phytophthora ramorum. http://www.suddenoakdeath.org/pdf/MGBinder.Redwoodreport.9.02.pdf
Pyracantha koidzumii (PYEKO) Minor
* Briere SC, Llewellyn S & Kristjanson G (2006) First report of Pyracantha koidzumii as a host for Phytophthora ramorum. Second Science Symposium: The State of our Knowledge, 496.
Quercus (1QUEG) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Quercus acuta (QUEAC) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Quercus cerris (QUECE) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Quercus chrysolepis (QUECH) Minor
* Murphy SK & Rizzo DM (2003) First report of Phytophthora ramorum on canyon live oak in California. Plant Disease 87(3), 315.
Quercus falcata (QUEFC) Minor
* Brasier CM, Denman S, Rose J, Kirk SA, Hughes KJD, Griffin RL, Lane CR, Inman AJ & Webber JF (2004) First report of ramorum bleeding canker on Quercus falcata, caused by Phytophthora ramorum. Plant Pathology 53, 804.
Quercus ilex (QUEIL) Minor
* Brasier C, Denman S, Brown A & Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycological Research 108(10), 1108-1110.
Quercus kelloggii (QUEKE) Minor
* Garbelotto M, Svihra P & Rizzo D (2001) New pests and diseases: sudden oak death syndrome fells 3 oak species. California Agriculture 55(1), 9-19.
Quercus parvula var. shrevei (QUEPS) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum as the cause of extensive mortality of Quercus spp. and Lithocarpus densiflorus in California. Plant Disease 86(3), 205-214.
Quercus petraea (QUEPE) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Quercus phillyreoides (QUEPI) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Quercus robur (QUERO) Minor
* Fera (2015) Fera list of natural hosts for Phytophthora ramorum with symptom and location. https://planthealthportal.defra.gov.uk/assets/uploads/P-ramorum-host-list-finalupdate-NOV-20-15.pdf
Quercus rubra (QUERU) Minor
* Brasier CM, Denman S, Rose J, Kirk SA, Hughes KJD, Griffin RL, Lane CR, Inman AJ & Webber JF (2004) First report of ramorum bleeding canker on Quercus falcata, caused by Phytophthora ramorum. Plant Pathology 53, 804.
Rhododendron arboreum (RHOAB) Minor
* Jung T, Scanu B, Brasier CM, Webber J, Milenković I, Corcobado T, Tomšovský M, Pánek M, Bakonyi J, Maia C, Bačová A, Raco M, Rees H, Pérez-Sierra A & Jung MH (2020) A survey in natural forest ecosystems of Vietnam reveals high diversity of both new and described Phytophthora taxa including P. ramorum. Forests 11, 93. https://doi.org/10.3390/f11010093
Rhododendron catawbiense (RHOCW) Minor
* Werres S, Marwitz R, Man in’t Veld WA, De Cock AWAM, Bonants PJM, De Weerdt M, Themann K, Ilieva E & Baayen RP (2001) Phytophthora ramorum sp. nov., a new pathogen on Rhododendron and Viburnum. Mycological Research 105(10), 1155-1165.
Rhododendron macrophyllum (RHOMC) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Rhododendron ponticum (RHOPO) Minor
* Willoughby IH, Seier MK, Stokes VJ, Thomas SE & Varia S (2015) Synthetic herbicides were more effective than a bioherbicide based on Chondrostereum purpureum in reducing resprouting of Rhododendron ponticum, a host of Phytophthora ramorum in the UK. Forestry 88(3), 336-344.
Rhododendron yakushimanum (RHOYA) Minor
* Gullino C, Garofalo MC, Moretti F, Gianetti G & Mainenti E (2003) Discovery of Phytophthora ramorum on rhododendron. Informatore Agrario 59(19), 87-89.
Ribes laurifolium (RIBLF) Minor
* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Rosa (1ROSG) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Rosa gymnocarpa (ROSGY) Minor
* Hüberli D, Reuther KD, Smith A, Swain S, Tse JG & Garbelotto M (2004) First report of foliar infection of Rosa gymnocarpa by Phytophthora ramorum. Plant Disease 88(4), 430.
Rosa rugosa (ROSRG) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC. 

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon.  https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Rubus spectabilis (RUBSP) Minor
* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12.
Salix caprea (SAXCP) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Sarcococca (1SARG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Schima argentea (SHMAR) Minor
* Fera (2015) Fera list of natural hosts for Phytophthora ramorum with symptom and location. https://planthealthportal.defra.gov.uk/assets/uploads/P-ramorum-host-list-finalupdate-NOV-20-15.pdf
Schima wallichii (SHMWA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Sequoia sempervirens (SEQSE) Minor
* Maloney PE, Rizzo DM, Koike ST, Harnik TY & Garbelotto M (2002) First report of Phytophthora ramorum on coast redwood in California. Plant Disease 86(11), 1274.
Taxus baccata (TAXBA) Minor
* Lane CR, Beales PA, Hughes KJD, Tomlinson JA, Inman AJ & Warwick K (2004) First report of ramorum dieback (Phytophthora ramorum) on container-grown English yew (Taxus baccata) in England. Plant Pathology 53, 522.
Taxus brevifolia (TAXBR) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Taxus x media (TAXME) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Torreya californica (TOYCA) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Toxicodendron diversilobum (RHUDI) Minor
* Davidson JM, Werres S, Garbelotto M, Hansen M & Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Progress 4(1), 12.
Trientalis latifolia (TNTLA) Minor
* Hüberli D, Van Sant-Glass W, Tse JG & Garbelotto M (2003) First report of foliar infection of starflower by Phytophthora ramorum. Plant Disease 87(5), 599.
Tsuga heterophylla (TSUHE) Minor
* Webber JF, Mullet M & Brasier CM (2010) Dieback and mortality of plantation Japanese larch (Larix kaempferi) associated with infection by Phytophthora ramorum. New Disease Reports 22, 19.
Umbellularia californica (UMBCA) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Vaccinium (1VACG) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Vaccinium intermedium (VACIN) Minor
* Fera (2015) Fera list of natural hosts for Phytophthora ramorum with symptom and location. https://planthealthportal.defra.gov.uk/assets/uploads/P-ramorum-host-list-finalupdate-NOV-20-15.pdf
Vaccinium myrtillus (VACMY) Minor
* Herrero ML, Toppe B & Brurberg MB (2011) First report of Phytophthora ramorum causing shoot dieback on bilberry (Vaccinium myrtillus) in Norway. Plant Disease 95(3), 355.

* USDA (2010) Phytophthora ramorum Werres, de Cock & Man in’t Veld. Pest Risk Assessment for Oregon. https://static1.squarespace.com/static/58740d57579fb3b4fa5ce66f/t/599dec4b2994ca3914cdde86/1503521868110/Pram_PRA_OR_11192010.pdf
Vaccinium ovatum (VACOV) Minor
* Rizzo DM, Garbelotto M, Davidson JM, Slaughter GW & Koike ST (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships. In. Standiford RB et al. (2002) Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in Californias Challenging Landscape. General Technical Report PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, US Department of Agriculture 184, 733-740.
Vaccinium vitis-idaea (VACVI) Minor
* Orlikowski LB (2008) Occurrence and harmfulness of Phytophthora spp. in Polish hardy ornamental nursery stock. In: International Symposium on Woody Ornamentals of the Temperate Zone 885: 243-248.
Vancouveria planipetala (VAVPL) Minor
* Cave GL, Randall-Schadel B & Redlin SC (2008) Risk analysis for Phytophthora ramorum Werres, de Cock & Man in’t Veld, causal agent of sudden oak death, ramorum leaf blight, and ramorum dieback. US Department of Agriculture, Animal and Plant Health Inspection Service, Raleigh, NC.
Viburnum davidii (VIBDV) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Viburnum hillieri (VIBHI) Minor
* O’Hanlon R, Choiseul J, Corrigan M, Catarame T & Destefanis M (2016) Diversity and detections of Phytophthora species from trade and non-trade environments in Ireland. EPPO Bulletin 46(3), 594-602.
Viburnum plicatum var. tomentosum (VIBPT) Minor
* Parke JL, Linderman RG, Osterbauer NK & Griesbach JA (2004) Detection of Phytophthora ramorum blight in Oregon nurseries and completion of Koch’s postulates on Pieris, Rhododendron, Viburnum, and Camellia. Plant Disease 88(1), 87.
Viburnum tinus (VIBTI) Minor
* Lane CR, Beales PA, Hughes KJD, Griffin RL, Munro D, Brasier CM & Webber JF (2003) First outbreak of Phytophthora ramorum in England, on Viburnum tinus. Plant Pathology 52, 414.
Viburnum x bodnantense (VIBBO) Minor
* Werres S, Marwitz R, Man in’t Veld WA, De Cock AWAM, Bonants PJM, De Weerdt M, Themann K, Ilieva E & Baayen RP (2001) Phytophthora ramorum sp. nov., a new pathogen on Rhododendron and Viburnum. Mycological Research 105(10), 1155-1165.
Viscum (1VISG) Minor
* Riley KL & Chastagner GA (2011) First report of Phytophthora ramorum infecting mistletoe in California. Plant Health Progress 12(1), 38.
Arctostaphylos (1ARYG) Wild/Weed
* Rooney-Latham S, Blomquist CL, Soriano MC, Uhler M (2020) First report of Phytophthora ramorum causing foliar and stem blight of two California native Arctostaphylos species, A. viridissima and A. glauca. Plant Disease. https://doi.org/10.1094/PDIS-07-19-1359-PDN
------- A. viridissima is a confirmed host.
Chamerion angustifolium (CHAAN) Wild/Weed
* Shishkoff N (2012) Susceptibility of some common container weeds to Phytophthora ramorum. Plant Disease 96(7), 1026-1032. 
Epilobium ciliatum (EPICT) Wild/Weed
* Shishkoff N (2012) Susceptibility of some common container weeds to Phytophthora ramorum. Plant Disease 96(7), 1026-1032. 
Pteris cretica (PTJCR) Wild/Weed
* Shishkoff N (2012) Susceptibility of some common container weeds to Phytophthora ramorum. Plant Disease 96(7), 1026-1032.