Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide


Pythium ultimum
(black-leg of seedlings)



Pythium ultimum (black-leg of seedlings)


  • Last modified
  • 20 November 2019
  • Datasheet Type(s)
  • Pest
  • Preferred Scientific Name
  • Pythium ultimum
  • Preferred Common Name
  • black-leg of seedlings
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Chromista
  •     Phylum: Oomycota
  •       Class: Oomycetes
  •         Order: Pythiales
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Preferred Scientific Name

  • Pythium ultimum Trow

Preferred Common Name

  • black-leg of seedlings

International Common Names

  • English: damping-off of seedlings; fruit rot; leek of potato; root rot; stem rot of seedlings; tree decline; watery wound rot of potato
  • Spanish: marras de nascencia
  • French: fonte des semis; piétin pythien; pourriture aqueuse de la pomme de terre; pourriture de la tige; pourriture pythienne; pourriture pythienne de la gousse

Local Common Names

  • Germany: Fruchtfäule; Schwarzbeinigkeit: Keimlinge; Umfallkrankheit: Keimlinge; Wurzelbrand: Keimlinge; Wurzelfäule: Keimlinge

EPPO code

  • PYTHUL (Pythium ultimum)

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Chromista
  •         Phylum: Oomycota
  •             Class: Oomycetes
  •                 Order: Pythiales
  •                     Family: Pythiaceae
  •                         Genus: Pythium
  •                             Species: Pythium ultimum

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.

Last updated: 10 Jan 2020
Continent/Country/Region Distribution Last Reported Origin First Reported Invasive Reference Notes


EgyptPresentCABI Data Mining (Undated)


ChinaPresentCABI (Undated a)
-NingxiaPresentCABI (Undated a)
-ShandongPresentZhang et al. (2018)
-ZhejiangPresentCABI Data Mining (Undated)
IndiaPresentCABI Data Mining (Undated)
-Himachal PradeshPresentCABI Data Mining (Undated)
-Uttar PradeshPresentCABI Data Mining (Undated)
IranPresentHatami et al. (2013)
IraqPresentCABI Data Mining (Undated)
JapanPresentCABI Data Mining (Undated)
JordanPresentCABI (Undated a)
South KoreaPresentCABI Data Mining (Undated)


Federal Republic of YugoslaviaPresentCABI Data Mining (Undated)
FrancePresentCABI Data Mining (Undated)
GermanyPresentCABI Data Mining (Undated)
ItalyPresentCABI Data Mining (Undated)
RussiaPresentCABI (Undated a)
Serbia and MontenegroPresentCABI (Undated a)
United KingdomPresentCABI Data Mining (Undated)

North America

CanadaPresentCABI (Undated a)
-AlbertaPresentCABI Data Mining (Undated)
-British ColumbiaPresentCABI Data Mining (Undated)
-OntarioPresentCABI Data Mining (Undated)
-QuebecPresentCABI (Undated a)
-SaskatchewanPresentCABI (Undated a)
MexicoPresentCABI (Undated a)
United StatesPresentCABI (Undated a)
-AlabamaPresentCABI Data Mining (Undated)
-CaliforniaPresentCABI (Undated a)
-MinnesotaPresentCABI Data Mining (Undated)
-MissouriPresentCABI (Undated a)
-MontanaPresentCABI Data Mining (Undated)
-New JerseyPresentCABI Data Mining (Undated)
-New YorkPresentCABI Data Mining (Undated)
-OklahomaPresentCABI (Undated a)
-VirginiaPresentCABI Data Mining (Undated)
-WashingtonPresentCABI (Undated a)


AustraliaPresentCABI (Undated)Present based on regional distribution.
-New South WalesPresentCABI (Undated a)
-VictoriaPresentPetkowski et al. (2013)

South America

PeruPresentCABI (Undated a)

Natural enemies

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Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Actinoplanes missouriensis Pathogen
Aphelenchus avenae Herbivore peas
Clonostachys rosea Antagonist
Enterobacter cloacae Pathogen
Gliocladium catenulatum Antagonist
Gliocladium virens Antagonist
Hebeloma crustuliniforme Pathogen
Humicola fuscoatra Pathogen
Hypocrea rufa Mycoparasite
Laetisaria arvalis Pathogen
Myrothecium verrucaria Pathogen
Paecilomyces variotii Pathogen
Penicillium oxalicum Pathogen
Pseudomonas fluorescens Antagonist Montana
Pseudomonas putida Pathogen
Pythium monospermum Antagonist
Pythium nunn Antagonist
Pythium oligandrum Mycoparasite
Rhizobium radiobacter Pathogen
Rhizobium rhizogenes Pathogen
Thanatephorus cucumeris Pathogen
Tolypocladium niveum Pathogen
Trichoderma hamatum Antagonist
Trichoderma harzianum Antagonist
Trichoderma koningii Antagonist
Trichoderma pseudokoningii Antagonist

Distribution Maps

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