Phytophthora alticola

Name and publication

Phytophthora alticola Maseko, Coutinho & Wingfield (2007)

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

Phytophthora alticola Maseko, Cout. & M.J. Wingf., Mycological Research 111 (11): 1332 (2007) emend.

Bose T, Burgess TI, Roux J, Wingfield MJ. 2017. Phytophthora alticola; revised description based on new collections and a neotype. Sydowia. 69: 161–170.

Corresponding author:


from Bose et al. (2017)




amended description (Bose et al. 2017)

Neotype: SOUTH AFRICA, KwaZulu-Natal, Commondale, from Eucalyptus grandis, November 2014, leg. T. Bose PREM61767

Ex-neotype: CBS 141718 = CMW48711

Sequences of ex-neotype in amended manuscript: Phytophthora alticola isolate TBF0060A10 = ITSrDNA KX247599, B-tub KX247592, HSP90 KX247578, CoxI KX247585

Ex-type in other collections

CMW 48711 = CBS 141718 

Molecular identification

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

Phytophthora alticola isolate TBF0060A10 ITS rDNA KX247599

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

Clade 4

Morphological identification

Colonies and cardinal temperatures

Colony morphology is appressed with no distinctive growth pattern and regular smooth margins on CA, V8A, MEA, and PDA. Minimum growth temperature 10°C, optimum 25°C, and maximum 32.5°C.

Conditions for growth and sporulation

Sporangia are produced in water cultures (soil extract or river water) and not observed in solid media. Oogonia are formed readily in single-strain culture on CA and V8A after about 14 days.

Asexual phase

Sporangia are papillate, persistent, and predominantly ovoid. Sporangia average 37.9 ± 4.1 × 27.2 ± 4.5 mm (overall range 19.6–49.2 × 17.4–36.7 mm). Sporangiophores in simple sympodia with no proliferation. Hyphal swellings are rare. Chlamydospores absent

Sexual phase

Homothallic. Oogonia are globose with wavy walls turning golden-brown on maturity, average size 28 ± 2.5 mm (20.4–32.3 mm). Oospores are aplerotic, globose with thick walls, average size 23.03 ± 2.47 µm (19.1−29.2). Antheridia are paragynous.

Most typical characters

Phytopthora alticola forms a species complex with Phytophthora boodjera and Phytophthora arenaria and is morphologically very similar to these species.

Specimen(s) evaluated

South Africa; KwaZulu-Natal, Commondale, from Eucalyptus grandis soil sample, Nov. 2014, T. Bose, CBS141718 = CMW48711; Melmoth, from natural forest soil sample, Nov. 2015, T Bose, CBS141719= CMW48712; Melmoth, from natural forest soil sample, Nov. 2015, Tanay Bose, CBS141720 = CMW48713; Melmoth, from E. grandis soil sample, Mar. 2016, T Bose, CBS141721 = CMW48714; Melmoth, from E. grandis soil sample, Mar. 2016, Tanay Bose, CBS141722 = CMW48715. Commondale, from A. mearnsii soil sample (S14.527 E31 00.144), Mar. 2016, Tanay Bose, CBS141723 = CMW48716. Vryheid, from E. grandis soil sample, Mar. 2016, collected by Tanay Bose, CBS141724 = CMW48717.

Hosts and distribution

Notes: nom. dub. per Simamora et al. (2015)
Distribution: Africa (South Africa)
Substrate: plant material, soil
Disease note: Eucalyptus collar and root rot
Host: Eucalyptus badjensis, Eucalyptus dunnii, Eucalyptus macarthurii (Myrtaceae)

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

Additional references and links

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

Fact sheet authors

Treena Burgess, Ph.D., Centre for Phytophthora Science and Management, School of Biological Sciences and Biotechnology, Murdoch University, Australia; Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America