Phytophthora frigida

Name and publication

Phytophthora frigida Maseko, Coutinho & Wingf. (2007)

Maseko B, Burgess TI, Coutinho TA, and Wingfield MJ. 2007. Two new Phytophthora species from South Africa. Mycol. Res. 111: 1321–1338.

Corresponding author:


from Maseko et al. (2007)




refers to the fact that this species is cold tolerant


Type: REPUBLIC OF SOUTH AFRICA, Natal Province: Sutton plantation, Ixopo, Eucalyptus smithii, Feb. 2001, B.O.Z Maseko, PREM 59222 dried culture with asexual structures on CMA with a corresponding microscope slide

Ex-type: culture CMW 20311

Sequences for ex-type in original manuscript: CMW 20311 = ITS rDNA: DQ988182 short 722bp; β tubulin: DQ988221

Ex-type in other collections

CMW 20311 = P16947 (WOC/WPC), CPHST BL 39G (Abad), CBS 121941, CBS 121939, PREM 59221, 47G8 (Yang)

Molecular identification

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

Phytophthora frigida isolate CPHST BL 39G (= P16947 WPC) = ITS rDNA MG865496, COI MH136892

Sequences for ex-type in other sources
Position in phylogenetic tree

Clade 2d

Morphological identification

adapted from Maseko et al. (2007)

Colonies and cardinal temperatures

Colony morphology after 7 days on PDA, V8A, and MEA with light stellate to rosaceous pattern. Minimum growth temperature 9°C, optimum 24–30°C, and maximum 33°C.

Asexual phase

Sporangia papillate; caducous with short pedicels; ovoid, obpyriform, or irregular shaped (24–40 x 20–33 µm), originated in simple sympodial sporangiophores. Hyphal swellings globose and intercalary. Chlamydospores terminal, globose (20–35 µm diam.), thin or thick-walled.

Sexual phase

Heterothallic. Oogonia terminal, spherical with smooth walls (25–42 µm diam.); antheridia amphigynous, elongated, cylindrical, or spherical to ellipsoidal; oospores plerotic/aplerotic (19–38 µm diam.). Original publication pairings with A1 & A2 Phythophthora nicotianae.

Additional specimen(s) evaluated

Phytophthora frigida ex-type CPHST BL 39G, duplicate of P16947 (World Phytophthora Collection), which is a duplicate of CBS 121941

Hosts and distribution

Distribution: Africa (South Africa), South America (Brazil), Australia
Substrate: plant material, soil
Disease note: Eucalyptus collar and root rot
Host: Acacia decurrens, A. mearnsii (Fabaceae), Eucalyptus smithii (Myrtaceae)

Retrieved January 30, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional info:
Substrate: roots

Quarantine status

USA: This species was listed as a species of concern during the 2009 Phytophthora prioritization project conducted by USDA APHIS PPQ CPHST PERAL (Schwartzburg et al.).

Phytophthora frigida is also listed in the U.S. Regulated Plant Pest Table (last modified Nov. 15, 2017).

Additional references and links

Fact sheet author

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