Phytophthora personensis

Name and publication

Phytophthora personensis Z.G. Abad, W. Gut. & T.I. Burgess (2020)

Burgess TI and Abad ZA. 2020. Phytophthora personensis. Fungal Planet 1104. Persoonia 44: 141 in Crous et al. Fungal Planet description sheets 1042–1111. Persoonia 44: 301-459.





named after Person County, North Carolina, the location where the first specimen of the species was isolated


Type: Australia, Western Australia, Busselton, baited from soil associated with dying Grevillea mccutcheonii (Myrtaceae), 2005, holotype MURU481

Ex-type: culture CBS 146549 = VHS14081

Sequences of ex-type in manuscript: ITS EU301169, β-tubulin MF326805, HSP90 MF326890, coxI MF326887, nadh1 MF326928, LSU MT159417

Molecular identification

Position in ITS phylogenetic tree

Clade 6a

Morphological identification

Colonies and cardinal temperatures

Colony morphology on all media was submerged and uniform except for PDA which produced cottony colonies. Minimum growth temperature 4°C, optimum 27.5°C, and maximum 37.5°C.

Conditions for growth and sporulation

Sporangia are produced in water cultures (soil extract) and not observed in solid media. Oogonia were not formed even when paired with different mating types.

Asexual phase

Sporangia were non-papillate, persistent, and predominantly ovoid in shape with internal proliferation, both nested and extended. Sporangia averaged 62.8 x 44.2 µm (overall range 28.5–85.6 x 15.1–60.5 µm). Sporangiophores simple. Hyphal swellings present. Chlamydospores present.

Sexual phase

Sterile in culture.

Most typical characters

Phytophthora personensis resides in clade 6a and shares a common ancestor with P. inundata, P. condilina, P. humicola, P. balyanboodja, and P. chesapeakensis. All these species are morphologically similar. Sequences from Norway and Pakistan submitted to GenBank as P. inundata share 100% identity with P. personensis.

Additional specimen(s) evaluated

Australia, Western Australia, Busselton, baited from soil associated with dying Grevillea mccutcheonii , 2005, CBS146549 = VHS14081; Pemberton, baited from soil associated with dying Rubus fruticosus, 2012, S. Aghighi, SA278; Victoria, Ti-Tree Creek, baited from water, 2008, W. Dunstan, culture MUCC 767; USA, Northern Carolina, Person County, from necrotic roots of Nicotiana tabacum, 2002, W. Gutierrez, P11555 = CBS121980; P11491

Hosts and distribution

Distribution: Australia, USA
Substrate: roots
Disease note: Phytophthora root and collar rot of young seedlings
Hosts: Nicotiana tabacum, Rubus fruticosus, Grevillea mccutcheonii

Additional references and links

none available

Fact sheet author

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