Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide


Olpidium brassicae
(Olpidium seedling blight)



Olpidium brassicae (Olpidium seedling blight)


  • Last modified
  • 26 February 2019
  • Datasheet Type(s)
  • Pest
  • Vector of Plant Pest
  • Preferred Scientific Name
  • Olpidium brassicae
  • Preferred Common Name
  • Olpidium seedling blight
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Fungi
  •     Phylum: Chytridiomycota
  •       Class: Chytridiomycetes
  •         Order: Spizellomycetales
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Preferred Scientific Name

  • Olpidium brassicae (Woronin) P.A. Dang.

Preferred Common Name

  • Olpidium seedling blight

Other Scientific Names

  • Asterocystis radicis De Wild.
  • Chytridium brassicae Woronin
  • Olpidiaster radicis (De Wild.) Pascher
  • Olpidium borzii De Wild.
  • Olpidium radicicola De Wild.
  • Pleotrachelus brassicae (Woronin) Sahtiy.

International Common Names

  • English: seedling blight of tobacco; seedling disease of cabbage
  • Spanish: enfermedad de nasciencia
  • French: brulure du lin; maladie de la brulure du lin; maladie des grosses nervures de la laitue; necrose des radicelles des cereales

Local Common Names

  • Germany: Auflaufkrankheit: Kohl; Gelbsucht: Tabak; Halsbrand: Kohl; Schwarzbeinigkeit: Kohl; Wurzelbrand: Kohl

EPPO code

  • OLPIBR (Olpidium brassicae)

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Fungi
  •         Phylum: Chytridiomycota
  •             Class: Chytridiomycetes
  •                 Order: Spizellomycetales
  •                     Family: Olpidiaceae
  •                         Genus: Olpidium
  •                             Species: Olpidium brassicae

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


IndiaPresentSingh & Pavagi, 1975; Ardey and Mukerji, 1986
-Andhra PradeshPresentSubrahmanyam and McDonald, 1980
-GujaratPresentSubrahmanyam and McDonald, 1980
-Indian PunjabPresentSubrahmanyam and McDonald, 1980
JapanPresentMorikawa and Taga, 2004
TurkeyPresentDoken et al., 1994; Demirci et al., 1995


South AfricaPresentMorris and Knox-Davies, 1977

North America

CanadaPresentPresent based on regional distribution.
-AlbertaPresentTewari and Bains, 1983
-OntarioPresentBarr and Kemp, 1975; Kemp and Barr, 1978
-QuebecPresentBarr and Kemp, 1975
USAPresentPresent based on regional distribution.
-CaliforniaPresentCampbell & Lot, 1996
-FloridaPresentFalk and Guzman, 1984

South America

BrazilPresentLin, 1979
ChilePresentRosales et al., 2004
ColombiaPresentPineda-Lopez & Martinez-Lopez, 1977


BelgiumPresentVerhoyen et al., 1985
Czechoslovakia (former)PresentChod et al., 1976; Mali and Bojnansky, 1979
DenmarkPresentLange, 1973; Lange, 1976
FinlandPresentBremer and Lahdenpera, 1980
GermanyPresentBedlan, 1986
GreecePresentTjavella-Klonari et al., 1991
ItalyPresentRagozzino et al., 1971; Vovlas et al., 1973; Diana and Piccirillo, 1994
NetherlandsPresentHakkart et al., 1975; Witte, 1981; Rast, 1988
NorwayPresentVare et al., 1992
Russian FederationPresentBojnansky et al., 1974; Medvedskaya, 1981
SpainPresentIzquierde-Tamayo, 1973
SwedenPresentRyden & Erikssen, 1978; Gripwall, 1986
UKPresentThomas, 1984


AustraliaPresentLatham and Jones, 2004
-TasmaniaPresentArcher et al., 2000
-Western AustraliaPresentArcher et al., 2000
New ZealandPresentThomas and Fry, 1972; Thomas, 1973

Growth Stages

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List of Symptoms/Signs

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SignLife StagesType
Leaves / abnormal colours
Whole plant / damping off
Whole plant / plant dead; dieback

Plant Trade

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Plant parts liable to carry the pest in trade/transportPest stagesBorne internallyBorne externallyVisibility of pest or symptoms
Bulbs/Tubers/Corms/Rhizomes hyphae; spores Yes Pest or symptoms not visible to the naked eye but usually visible under light microscope
Growing medium accompanying plants spores Yes Pest or symptoms usually invisible
Roots hyphae; spores Yes Pest or symptoms not visible to the naked eye but usually visible under light microscope
Plant parts not known to carry the pest in trade/transport
Fruits (inc. pods)
Seedlings/Micropropagated plants
Stems (above ground)/Shoots/Trunks/Branches
True seeds (inc. grain)


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Archer C, Wilson C, Gibson L, 2000. Improving lettuce quality through reduction in losses due to soil borne diseases. In: Australian Lettuce Industry Conference, Hay, New South Wales, Australia, 6-8 June, 2000. Orange, Australia: Library, NSW Agriculture, 80-85

Ardey J, Mukerji KG, 1986. Fungi associated with the roots of herbaceous plants. Current Science, India, 55(18):934-935

Barr DJS, 1988. Zoosporic plant parasites as fungal vectors of viruses: taxonomy and life cycles of the species involved. In: Cooper JI, Asher MJC, eds. Developments in Applied Biology 2, 1988, Viruses with Fungal Vectors. Wellesbourne, UK: Association of Applied Biologists, 123-137

Barr DJS, Kemp WG, 1975. Olpidium brassicae, tobacco necrosis virus, and Pythium spp. in relation to rusty root of carrots in Ontario and Quebec. Canadian Plant Disease Survey, 55(2):77-82

Bedlan G, 1986. Seedling diseases. Pflanzenschutz, No. 1:13-14; [3 fig.]

Bojnansky V, Subikova V, Mali VR, 1974. New host plant of tobacco necrosis virus and its vector. Pol'nohospodarstvo, 20(6/7):429-435

Bollen GJ, Volker D, Bertoldi M de, Sequi P, Lemmes B, Papi T, 1996. The Science of Composting. Part 1. Glasgow, UK: Blackie Academic & Professional, 233-246

Bos L, Huijberts N, 1990. Screening for resistance to big-vein disease of lettuce (Lactuca sativa). Crop Protection, 9(6):446-452

Bos L, Huijberts N, 1996. Lettuce ring necrosis, caused by a chytrid-borne agent distinct from lettuce big-vein 'virus'. European Journal of Plant Pathology, 102(9):867-873; 22 ref

Bremer K, Lahdenpera M-L, 1980. A disease of out-door cucumbers caused by the tobacco necrosis virus in Finland. Annales Agriculturae Fenniae, 19(1):5-8

Campbell RN, 1996. Fungal transmission of plant viruses. Annual Review of Plant Pathology, 34:87-108

Campbell RN, Lot H, 1996. Lettuce ring necrosis, a viruslike disease of lettuce: evidence for transmission by Olpidium brassicae. Plant Disease, 80(6):611-615; 20 ref

Campbell RN, Sim ST, 1994. Host specificity and nomenclature of Olpidium bornovanus (=Olpidium radicale) and comparisons to Olpidium brassicae. Canadian Journal of Botany, 72(8):1136-1143

Chod J, Polak J, Kudela V, Jokes M, 1976. Finding of lettuce big vein virus in Czechoslovakia. Biologia Plantarum, 18(1):63-66

D÷ken MT, Demirci E, Acikg÷z S, 1994. Morphology of Olpidium brassicae (Wor.) Dang. and its transmission of big-vein virus to lettuce. Journal of Turkish Phytopathology, 23(3):133-142; 17 ref

Demirci E, Acikgoz S, Dohen MT, 1995. Relations of some weed species with lettuce big-vein virus in Ereurum-Turkiye. Journal of Turkish Phytopathology, 24(3):135-137

Diana G, Piccirillo P, 1994. Adversities of the tobacco crop: fungi. Informatore Fitopatologico, 44(1):7-16; 16 ref

Dorst HJM Van, Peters D, 1988. Experiences with freesia leaf necrosis virus and its presumed vector, Olpidium brassicae. In: Cooper JI, Asher MJC, eds. 1988 Viruses with Fungal Vectors. Wellesbourne, UK : Assoc. Appl. Biol

Falk BW, Guzman VL, 1984. First report of lettuce big vein in Florida. Plant Disease, 68(10):918

Gamliel A, Hadar E, Katan J, 1993. Improvement of growth and yield of Gypsophila paniculata by solarization or fumigation of soil or container medium in continuous cropping systems. Plant Disease, 77(9):933-938

Gharbi S, Meunier S, Verhoyen M, 1990. A new method for determining the efficacy of products and fungicides for controlling Olpidium brassicae and transmission of viruses in nutrient film culture solution. Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent, 55(3a):1073-1083

Gharbi S, Verhoyen M, 1993. Sterilization by UV irradiation of nutrient solutions with a view to avoiding viral infections transmitted by O. brassicae in hydroponic culture of lettuce. Mededelingen van de Faculteit Landbouwwetenschappen, Universiteit Gent, 58(3a):1113-1124

Gharbi S, Verhoyen M, 1994. Effect of temperature and pH on Olpidium brassicae. Mededelingen - Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen, Universiteit Gent, 59(3a):819-833

Gokpinar D, Eppler A, Schlosser E, 1988. Differentiation of strains of tobacco necrosis virus in sugarbeet. Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent, 53(2a):515-520

Gripwall E, 1986. Incidence of lettuce big vein in Sweden. Vaxtskyddsnotiser, 50(4-5):133-135, 141

Hakkart FA, Rattink H, Nederpel L, Beuzenberg MP, Dorst HJM, Van, 1975. Annual Report 1974 Research Station for Flower Diseases in the Netherlands at Aalsmeer

Hiruki C, 1967. Host specificity in transmission of tobacco stunt virus by Olpidium brassicae. Virology, 33:131-136

Hiruki C, 1987. Recovery and identification of tobacco stunt virus from air-dried resting spores of Olpidium brassicae. Plant Pathology, 36(2):224-228

Izquierdo Tamayo A, 1973. The phycomycete Olpidium brassicae (Woronin) Dangeard, its attack on tobacco seed-beds and its role as a virus vector. Anales del Instituto Nacional de Investigaciones Agrarias, Proteccion Vegetal, No. 3:107-129

Kemp WG, Barr DJS, 1978. Natural occurrence of tobacco necrosis virus in a rusty-root disease complex of Daucus carota in Ontario. Phytopathologische Zeitschrift, 91(3):203-217

Lange L, 1973. [Tulip] infection by Queen Augusta disease (tobacco necrosis virus = TNV). Ugeskrift for Agronomer og Hortonomer, 2(28):493-494

Lange L, 1976. Augusta disease in tulips, Field experiments with tobacco necrosis virus (TNV) and its vector Olpidium brassicae. Tidsskrift for Planteavl, 80(2):153-169

Latham LJ, Jones RAC, 2004. Deploying partially resistant genotypes and plastic mulch on the soil surface to suppress spread of lettuce big-vein disease in lettuce. Australian Journal of Agricultural Research, 55(2):131-138

Lin MT, 1979. Occurrence and host range of Olpidium brassicae in Central Brazil. Plant Disease Reporter, 63(1):10-12

Mali VR, Bojnansky V, 1979. Occurrence of Olpidium brassicae (Wor.) Dang. on Euonymus europpa L. in Czechoslovakia. Biologia, Czechoslovakia, 34(1):47-54

Medvedskaya IG, 1981. Virus diseases of glasshouse cucumber. Zashchita Rastenii, 5:44-45

Morikawa T, Taga Y, 2004. Detection of Olpidium brassicae by a baiting plant method from field soils in Japan, and their transmissibility of tulip mild mottle mosaic virus. Soil Microorganisms, 58(1):43-52

Morris MJ, Knox-Davies PS, 1977. Olpidium brassicae reported in South Africa. Phytophylactica, 9(3):71-72

Nott L, Bambridge J, Walsh JA, 2003. Development of diagnostics for the detection and quantification of Olpidium brassicae. Proceedings of the Fifth Symposium of the International Working Group on Plant Viruses with Fungal Vectors, Institute of Plant Sciences, Swiss Federal Institute of Technology, Zurich, Switzerland, 22-25 July, 2002 [Proceedings of the Fifth Symposium of the International Working Group on Plant Viruses with Fungal Vectors, Institute of Plant Sciences, Swiss Federal Institute of Technology, Zurich, Switzerland, 22-25 July, 2002.]:29-30

Pineda-Lopez B, Martinez-Lopez G, 1977. Observaciones preliminares sobre la presencia de Olpidium brassicae (Wor.) Dang. y su posible asociacion con el "lettuce big-vein agent" en Colombia. Fitopatologia, 12(1):20-23

Ragozzino A, Caia R, Xafis C, 1971. Pathogenic lettuce viruses in Campania. Note I. Rivista della Ortoflorofrutticoltura Italiana, 55(4):356-376

Rast ATB, 1988. Occurrence of pepper yellow vein in the Netherlands. Netherlands Journal of Plant Pathology, 94(6):311-313

Rast ATB, 1993. Transmission of the pepper yellow vein agent by pepper and lettuce isolates of Olpidium brassicae. Mededelingen van de Faculteit Landbouwwetenschappen, Universiteit Gent, 58(3a):1093-1095

Rosales IM, Sepúlveda P, Bruna A, 2004. First report of lettuce big-vein virus and Mirafiori lettuce virus in Chile. Plant Disease, 88(11):1286.

Ryden K, Eriksson B, 1978. Soil-borne viruses and their vectors in Swedish plant nurseries. Vaxtskyddsrapporter, Tradgard 3:50 pp

Ryder EJ, Robinson BJ, 1991. 'Pacific' lettuce. HortScience, 26(4):437-438; 7 ref

Singh SL, Pavgi MS, 1975. Occurrence of Olpidium brassicae in India. Current Science, 44(3):89-91

Subrahmanyam P, McDonald D, 1980. Occurrence of Olpidium brassicae on groundnut. Transactions of the British Mycological Society, 75(3):506-509

Tewari JP, Bains P, 1983. Fungi associated with the roots of clover in Alberta. 1. Olpidium brassicae and Ligniera sp. Canadian Plant Disease Survey, 63(2):35-37

Thomas BJ, 1984. Occurrence and epidemiology of the cucumber necrosis strain of tobacco necrosis virus in cucumber crops. Report of the Glasshouse Crops Research Institute for 1982; 117-123. Littlehampton, West Sussex, UK

Thomas W, 1973. A necrotic disease of glasshouse beans caused by bean stipple streak virus. New Zealand Journal of Agricultural Research, 16(1):150-154

Thomas W, Fry PR, 1972. Cucumber systemic necrosis caused by a strain of tobacco necrosis virus. New Zealand Journal of Agricultural Research, 15(4):857-866

Tjavella-Klonari K, Manousopoulos J, Katis N, Tomlinson JA, Clay CM, 1991. Occurrence of lettuce big vein disease in Greece. Acta Horticulturae, No. 287:435-441; 8 ref

Vanachter A, Vanachter A, 1995. Development of Olpidium and Pythium in the nutrient solutions of NFT grown lettuce, and possible control methods. Fourth International Symposium on Soil and Substrate Infestation and Disinfestation, Leuven, Belgium, 6-12 Sepetember, 1993. Acta Horticulturae, 382:187-196

Vare H, Vestberg M, Eurola S, 1992. Mycorrhiza and root-associated fungi in Spitsbergen. Mycorrhiza, 1(3):93-104

Verhoyen M, Legrand G, Meunier S, 1985. Investigations of the aetiology of a necrotic ringspot of lettuce. Mededelingen van de Faculteit Landbouwwetenschappen Rijksuniversiteit Gent, 50(3b):1295-1300

Vovlas N, Avgelis A, D'Urso M, 1973. Nematodes and viruses, causes of serious damage in anemone cultivation in southern Italy. Informatore Fitopatologico, 23(8):19-22

Walkey DGA, Bolland CJ, Miller A, Walsh JA, Tomlinson JA, Pink DAC, Thomas CJR, Stanghellini ME, 1986. Virus diseases of lettuce. 36th Annual Report for 1985, National Vegetable Research Station Wellesbourne, Warwick, UK; National Vegetable Research Station, 54-56

White JG, 1980. Control of lettuce big-vein disease by soil sterilisation. Plant Pathology, 29(3):124-130

Witte M de, 1981. A new virus in cucumbers on rockwool. Melon necrosis virus. Groenten en Fruit, 36(50):48-49

Distribution Maps

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