Phytophthora vulcanica

Name and publication

Phytophthora vulcanica Jung, Horta Jung, Scanu, Bakonyi & Cacciola (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, 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 from volcanic soil (vulcanica Lat., volcanic)


Type: ITALY, Sicily; Mount Etna, isolated from rhizosphere soil of a mature Fagus sylvatica tree, May 2013, T. Jung (CBS H-22556–holotype, dried culture on V8A)

Ex-type: CBS 141216 = X3a

Sequences for ex-type in original manuscript: Phytophthora vulcanica isolate X3a = ITS rDNA MF036209, cox1 MF036287

Ex-type in other collections

CBS 141216 = X3a

Molecular identification

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

Phytophthora vulcanica isolate X3a ITS rDNA MF036209

Sequences for ex-type in other sources
  • NCBI: Phytophthora vulcanica x3a
  • Phytophthora DATABASE: Phytophthora vulcanica 
  • EPPO-Q-bank: Phytophthora vulcanica 
  • BOLDSYSTEMS: Phytophthora vulcanica 
Position in ITS phylogenetic tree

Clade 7a

Morphological identification

adapted from Jung et al. (2017)

Colonies and cardinal temperatures

Colonies on CA, V8A, PDA, and MEA with nondistinct pattern. Optimum growth temperature of 15°C and maximum 25–30°C.

Conditions for growth and sporulation

Sporangia not formed on solid agar but produced in nonsterile soil extract; gametangia produced on V8A cultures.

Asexual phase

Sporangia nonpapillate; persistent; ovoid, elongated, ellipsoid, limoniform, pyriform, and obpyriform (35.5–81 μm length x 22.5–43.0 μm width); presenting internal (nested) and extended proliferation; originated on unbranched sporangiophores or in lax sympodia, or less frequently laterally. Hyphal swellings formed on sporangiophores, subglobose, angular or irregular, and often catenulate. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled and often with tapered or curved bases, elongated, ellipsoid, to pyriform or eccentric, or less frequently globose to subglobose, turning golden-brown during ageing (23–46 μm diam.); antheridia predominantly paragynous; oospores predominantly aplerotic (20–38.0 μm diam.) containing a large ooplast. High oogonial abortion rate in most isolates.

Hosts and distribution

Distribution: Europe (Italy)
Substrate: rhizosphere soil
Disease note: pathogenic to roots in pathogenicity tests
Host: Fagus sylvatica (Fagaceae)

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

Additional references and links

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

Fact sheet author

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