Phytophthora ukrainensis

Name and publication

Phytophthora ukrainensis I. Milenković, T. Jung, T. Corcobado, I. Matsiakh (2022)

Jung T, Milenković I, Corcobado T. et al. 2022. Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implications. Persoonia-Molecular Phylogeny and Evolution of Fungi 49: 1–57.





Name refers to the origin of most known isolates in Ukraine.


Type: Ukraine, Lviv region, Ivano-Frankove, isolated from a naturally fallen Quercus leaf in the Vereshchytsia River, Aug. 2019, I. Milenković, T. Corcobado & I. Matsiakh, holotype HNHM-MYC-009710, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest

Ex-type: culture CBS 148851 = NRRL 64255 = UA373

Sequences for ex-type in original manuscript:  LSU ON000711, ITS ON000805, β-tubulin OM975984, hsp90 OM976501, tigA OM974679, rpl10 OM97539, enolase OM976596, cox1 ON013872, ypt1 ON025022, nadh1 OM976981, rps10 OM976740

Molecular identification

Position in ITS phylogenetic tree

Clade 10c

Morphological identification

Colonies and cardinal temperatures

Colony morphology submerged and radiate on CA, submerged and striate on V8A, and stoloniferous and dense felty on PDA. Optimum growth temperature 20°C and maximum 32.5°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 1–2d. Oogonia were not produced in paired cultures using several known tester strains.

Asexual phase

Sporangia were nonpapillate, persistent, and predominantly ovoid and obpyriform in shape. Sporangia averaged 35.9 x 26.2 µm (overall range 26.3–58.2 x 18.7–36.3 µm), proliferation internal, nested, and extended. Sporangiophores unbranched. Hyphae coralloid; hyphal swellings present. Chlamydospores absent.

Sexual phase

Sterile in culture.

Most typical characters

Resides in phylogenetic clade 10b and is closely related to P. gallica and P. subarctica. Compared to these species, P. ukrainensis has small sporangia and corraloid hyphae.

Additional specimen(s) evaluated

Sweden, Kiruna area, isolated from forest stream, Sept. 2017, I. Milenković & T. Corcobado, SW154. Ukraine, Lviv region, Ivano-Frankove, isolated from naturally fallen Quercus leaves in the Vereshchytsia River, Aug. 2019, I. Milenković, T. Corcobado & I. Matsiakh, UA376, UA430, UA431, UA432, UA433.

Hosts and distribution

Distribution: Ukraine, Sweden
Substrate: forest stream
Disease note: no known disease
Host: no known host

Additional references and links

none available

Fact sheet author

Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University