Phytophthora tyrrhenica

Name and publication

Phytophthora tyrrhenica Scanu, Cacciola, Seddaiu, Bakonyi & Jung (2017)

Jung T, Horta Jung M, Cacciola SO, Cech T, Bakonyi J, Seress D, Mosca S, Schena L, Seddaiu S, Pane A, Magnano di San Lio G, Maia C, Cravador A, Franceschini A, and Scanu B. 2017. Multiple new cryptic pathogenic Phytophthora species from Fagaceae forests in Austria, Italy, and Portugal. IMA Fungus 8 (2): 219–244.

Corresponding author e-mail:


from Jung et al. (2017)




refers to the origin of all known isolates in the Tyrrhenian islands Sardinia and Sicily (tyrrhenica Lat., Tyrrhenian)


Type: ITALY, Sardinia; Tergu, isolated from rhizosphere soil of a mature Quercus ilex tree, May 2012, B. Scanu (CBS H-22984–holotype, dried culture on V8A)

Ex-type: CBS 142301 = PH154

Sequences for ex-type in original manuscript: Phytophthora tyrrhenica isolate PH154 = ITSrDNA KU899188, cox1 KU899343

Ex-type in other collections

CBS 142301 = PH154

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)

Phytophthora tyrrhenica isolate PH154 = ITS rDNA KU899188

Sequences for ex-type in other sources
  • NCBI: Phytophthora tyrrhenica PH154
  • Phytophthora DATABASE: Phytophthora tyrrhenica 
  • EPPO-Q-bank: Phytophthora tyrrhenica 
  • BOLDSYSTEMS: Phytophthora tyrrhenica 
Position in ITS phylogenetic tree

Clade 7a

Morphological identification

adapted from Jung et al. (2017)

Colonies and cardinal temperatures

Colony morphology on CA, V8A, and PDA uniform, very limited and irregular growth on MEA. Optimum growth temperature 20°C, maximum 25–30°C.

Conditions for growth and sporulation

Sporangia not observed on solid agar but produced abundantly after 24 h in nonsterile soil extract; gametangia produced in single culture on V8A.

Asexual phase

Sporangia nonpapillate; persistent; ellipsoid, elongated, limoniform, ovoid, obpyriform (66–70 μm length x 27.5–31.9 μm width); presenting internal (usually nested) and external proliferation; originated on unbranched sporangiophores. Hyphal swellings catenulate, intercalary, globose to subglobose or irregular. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, globose to subglobose (25–39.5 μm diam.), often with a tapering base; antheridia paragynous, clavate, globose to subglobose; oospores plerotic (24.5–40 μm diam.) and usually containing a large ooplast.

Hosts and distribution

Distribution: Europe (Italy)
Substrate: rhizosphere soil
Disease note: pathogenic to roots in pathogenicity tests
Host: Quercus ilex, Q. suber (Fagaceae)

Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

  • Phytophthora DATABASE: Phytophthora tyrrhenica
  • EPPO-Q-bank: Phytophthora tyrrhenica
  • SMML USDA-ARS: Phytophthora tyrrhenica
  • EPPO Global Database: Phytophthora tyrrhenica
  • CABI Invasive Species Compendium: Phytophthora tyrrhenica
  • Encyclopedia of Life (EOL): Phytophthora tyrrhenica
  • Index Fungorum (IF): Phytophthora tyrrhenica
  • Plantwise Knowledge Bank: Phytophthora tyrrhenica

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America