Phytophthora oleae

Name and publication

Phytophthora oleae Schena, Ruano-Rosa, Agosteo & Cacciola (2018)

Ruano-Rosa D, Schena L, Agosteo GE, Magnano di San Lio G, and Cacciola SO. 2018. Phytophthora oleae sp. nov. causing fruit rot of olive in southern Italy. Plant Pathology 67: 1362–1373.

Corresponding author:


from Ruano-Rosa et al. (2018)




refers to the matrix (fruits of Olea europaea) from which this species was recovered


Type: ITALY, Calabria region, Vibo Valentia province, isolated from rotten drupes of olive (Olea europaea, Oleaceae family) in a commercial olive orchard at Mileto (Vibo Valentia province), in the middle of November 2015, collectors G.E. Agosteo and L. Schena; isolate Po1a; holotype: RCPH3, dried culture on V8A in the herbarium of the Department of Agriculture at the University Mediterranea of Reggio Calabria, Reggio Calabria, Italy

Ex-type: CBS 7669 (preserved as living culture at CBS-KNAW Fungal 307 Biodiversity Centre, Utrecht, The Netherlands)

Sequences for ex-type in original manuscript:

Phytophthora oleae isolate Po1a ITS KY982930

Ex-type in other collections

CBS 7669 = Po1a

Molecular identification

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

Phytophthora oleae Po1a = ITS rDNA KY982930, COI MF083569

Sequences for ex-type in other sources
  • NCBI: Phytophthora oleae Po1a
  • Phytophthora DATABASE: Phytophthora oleae
  • EPPO-Q-bank: Phytophthora oleae
  • BOLDSYSTEMS: Phytophthora oleae (barcoding COI & ITS)
Position in ITS phylogenetic tree

Clade 2

Morphological identification

adapted from Ruano-Rosa et al. (2018)

Colonies and cardinal temperatures

Colonies with a stellate to radial growth pattern on PDA, rosaceous on CA, and abundant aerial mycelium with no definite pattern on V8A. Cardinal temperatures (minimum, maximum, and optimum) for radial growth 10ºC, 25ºC, and 20ºC, respectively.

Conditions for growth and sporulation

Sexual reproductive structures were produced in single culture on V8A after one week. Sporangia abundant in water culture, less numerous on solid agar.

Asexual phase

Sporangia semipapillate, occasionally bipapillate; persistent; ovoid (32–58 µm length x 22–36 µm width), originated in lax, simple sympodial sporangiophore, sometimes sessile. Hyphal swellings catenulate and simple; intercalary are sporadically observed. Chlamydospores are also very sporadic and produced only on solid media.

Sexual phase

Homothallic. Oogonia smooth-walled, globose to subglobose (24–30 μm diam.); antheridia paragynous, club-shaped, and rarely with a finger-like appendix; oospores plerotic (22–28 μm diam.).

Additional references and links

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

Fact sheet author

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