Invasive Species Compendium

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Phytophthora kernoviae

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Datasheet

Phytophthora kernoviae

Summary

  • Last modified
  • 14 July 2018
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Preferred Scientific Name
  • Phytophthora kernoviae
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Chromista
  •     Phylum: Oomycota
  •       Class: Oomycetes
  •         Order: Peronosporales

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Pictures

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PictureTitleCaptionCopyright
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech) The affected beech tree is directly adjacent to a Rhododendron bush (Rhododendron ponticum and Rhododendron hybrids). UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech) The affected beech tree is directly adjacent to a Rhododendron bush (Rhododendron ponticum and Rhododendron hybrids). UK.
Copyright©Forest Research/United Kingdom Forestry Commission/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech) The affected beech tree is directly adjacent to a Rhododendron bush (Rhododendron ponticum and Rhododendron hybrids). UK.
SymptomsPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech) The affected beech tree is directly adjacent to a Rhododendron bush (Rhododendron ponticum and Rhododendron hybrids). UK.©Forest Research/United Kingdom Forestry Commission/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK.
SymptomsPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK. November 2003
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK. November 2003
Copyright©Forest Research/United Kingdom Forestry Commission/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK. November 2003
SymptomsPhytophthora kernoviae; symptoms, as a bleeding lesion on trunk of Fagus sylvatica (European beech). UK. November 2003©Forest Research/United Kingdom Forestry Commission/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as necrosis of rhododendron leaves. UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as necrosis of rhododendron leaves. UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as necrosis of rhododendron leaves. UK.
SymptomsPhytophthora kernoviae; symptoms, as necrosis of rhododendron leaves. UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as lesions on magnolia foliage. UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as lesions on magnolia foliage. UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as lesions on magnolia foliage. UK.
SymptomsPhytophthora kernoviae; symptoms, as lesions on magnolia foliage. UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as wilting of infected rhododendron. UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as wilting of infected rhododendron. UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as wilting of infected rhododendron. UK.
SymptomsPhytophthora kernoviae; symptoms, as wilting of infected rhododendron. UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a necrotic lesion on stems of Azalea and Rhododendron spp. UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as a necrotic lesion on stems of Azalea and Rhododendron spp. UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as a necrotic lesion on stems of Azalea and Rhododendron spp. UK.
SymptomsPhytophthora kernoviae; symptoms, as a necrotic lesion on stems of Azalea and Rhododendron spp. UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as lesion on foliage of Azalea and Rhododendron spp. UK.
TitleSymptoms
CaptionPhytophthora kernoviae; symptoms, as lesion on foliage of Azalea and Rhododendron spp. UK.
Copyright©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; symptoms, as lesion on foliage of Azalea and Rhododendron spp. UK.
SymptomsPhytophthora kernoviae; symptoms, as lesion on foliage of Azalea and Rhododendron spp. UK.©Central Science Laboratory/Crown Copyright/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. (a), (b) & (c), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
TitleAsexual spores
CaptionPhytophthora kernoviae; asexual spore. (a), (b) & (c), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Copyright©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. (a), (b) & (c), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Asexual sporesPhytophthora kernoviae; asexual spore. (a), (b) & (c), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. (d) & (e), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
TitleAsexual spores
CaptionPhytophthora kernoviae; asexual spore. (d) & (e), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Copyright©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. (d) & (e), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Asexual sporesPhytophthora kernoviae; asexual spore. (d) & (e), regular, ovoid limoniform sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. Figs (f), (g), (h) & (i), asymmetrical or ‘mouse-shaped’ sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
TitleAsexual spores
CaptionPhytophthora kernoviae; asexual spore. Figs (f), (g), (h) & (i), asymmetrical or ‘mouse-shaped’ sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Copyright©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US
Phytophthora kernoviae; asexual spore. Figs (f), (g), (h) & (i), asymmetrical or ‘mouse-shaped’ sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)
Asexual sporesPhytophthora kernoviae; asexual spore. Figs (f), (g), (h) & (i), asymmetrical or ‘mouse-shaped’ sporangia. Note scale = 10 µm. Reproduced from: Mycol. Res. 109 (8): 853–859 (August 2005). ©The British Mycological Society 853. (doi:10.1017/S0953756205003357)©Susan Kirk/Forest Research/Bugwood.org - CC BY-NC 3.0 US

Identity

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Preferred Scientific Name

  • Phytophthora kernoviae Brasier et al., 2005

Other Scientific Names

  • Phytophthora taxon C

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Chromista
  •         Phylum: Oomycota
  •             Class: Oomycetes
  •                 Order: Peronosporales
  •                     Family: Peronosporaceae
  •                         Genus: Phytophthora
  •                             Species: Phytophthora kernoviae

Distribution Table

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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Continent/Country/RegionDistributionLast ReportedOriginFirst ReportedInvasiveReferenceNotes

South America

ChilePresent, few occurrencesEPPO, 2016; Sanfuentes et al., 2016

Europe

DenmarkAbsent, confirmed by surveyEPPO, 2014
EstoniaAbsent, confirmed by surveyEPPO, 2014
IrelandPresent, few occurrencesEPPO, 2014
NetherlandsAbsent, confirmed by surveyNPPO of the Netherlands, 2013; EPPO, 2014Based on ongoing long-term monitoring for plant passport system and annual surveys, 336 survey observations in 2011.
UKRestricted distributionCABI/EPPO, 2008; EPPO, 2014
-England and WalesRestricted distributionCABI/EPPO, 2008; EPPO, 2014
-ScotlandPresentCABI/EPPO, 2008; EPPO, 2014

Oceania

New ZealandRestricted distributionCABI/EPPO, 2008; EPPO, 2014

Host Plants and Other Plants Affected

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Plant nameFamilyContext
Drimys winteriWinteraceaeUnknown
Michelia doltsopa (champ)MagnoliaceaeMain
Pieris japonica (Lily-of-the-valley shrub)PieridaeMain
Rhododendron catawbienseEricaceaeMain
Rhododendron ponticum (rhododendron)EricaceaeMain

List of Symptoms/Signs

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SignLife StagesType
Leaves / abnormal colours
Leaves / abnormal leaf fall
Leaves / necrotic areas
Stems / canker on woody stem
Whole plant / plant dead; dieback

Diagnosis

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A duplexPCR detection method, based on the internal transcribed spacer (ITS) regions of the ribosomal DNA, was developed by Schlenzig (2011) to enable sensitive detection of P. kernoviaeand to distinguish it from the similar P. ramorum.

OEPP/EPPO (2013) have published a diagnostic protocol for P. kernoviae, which involves (i) detection of symptoms in shrub and tree hosts, as well as in soil and water samples, and (ii) identification at the species level either by its growth characteristics in culture and morphology, or by molecular methods (PCR and real-time PCR tests).

 

References

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Aleksandrov IN; Arbuzova EN, 2012. Phytophthora kernoviae - a new invasive pathogen of the ornamental and tree crops. Zashchita i Karantin Rastenii, No.1:30-33. http://www.z-i-k-r.ru

Beales PA; Lane CR; Barton VC; Giltrap PM, 2006. Phytophthpra kernoviae on ornamentals in the UK. EPPO Bulletin, 36(2):377-379.

Brasier C, 2005. Preventing invasive pathogens: deficiencies in the system. Plantsman, 4(1): 54-57.

Brasier CM; Beales PA; Kirk SA; Denman S; Rose J, 2005. Phytophthora kernoviae sp. nov., an invasive pathogen causing bleeding stem lesions on forest trees and foliar necrosis of ornamentals in the UK. Mycological Research, 109(8): 853-859.

CABI/EPPO, 2008. Phytophthora kernoviae. [Distribution map]. Distribution Maps of Plant Diseases, April (Edition 1). Wallingford, UK: CABI, Map 1023.

EPPO, 2014. PQR database. Paris, France: European and Mediterranean Plant Protection Organization. http://www.eppo.int/DATABASES/pqr/pqr.htm

EPPO, 2016. EPPO Global database (available online). Paris, France: EPPO. https://gd.eppo.int/

Jeffers SN; Martin SB, 1986. Comparison of two media selective for Phytophthora and Pythium species. Plant Disease, 70(11):1038-1043

OEPP/EPPO, 2013. PM 7/112 (1) Phytophthora kernoviae. Bulletin OEPP/EPPO Bulletin, 43(1):81-93. http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2338

Sanfuentes E; Fajardo S; Sabag M; Hansen E; González M, 2016. Phytophthora kernoviae isolated from fallen leaves of Drymis winteri in native forest of southern Chile. Australasian Plant Disease Notes, 11(1):19. http://link.springer.com/article/10.1007/s13314-016-0205-6

Schena L; Hughes KJD; Cooke DEL, 2006. Detection and quantification of Phytophthora ramorum, P. kernoviae, P. citricola and P. quercina in symptomatic leaves by multiplex real-time PCR. Molecular Plant Pathology, 7(5): 365-379.

Schlenzig A, 2011. A duplex PCR method for the simultaneous identification of Phytophthora ramorum and Phytophthora kernoviae. Bulletin OEPP/EPPO Bulletin, 41(1):27-29. http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2338

Widmer TL, 2010. Differentiating Phytophthora ramorum and P. kernoviae from other species isolated from foliage of rhododendrons. Plant Health Progress, No.March:PHP-2010-0317-01-RS. http://www.plantmanagementnetwork.org/php/elements/sum2.aspx?id=8677

Distribution Maps

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