Phytophthora cambivora (to be updated 2022)

Name and publication

Phytophthora cambivora (Petri) Buisman (1927)

Buisman CJ. 1927. Root rots caused by Phycomycetes. Mededeelingen van het Phytopathologisch Laboratorium "Willie Commelin Schol- ten", Baarn, 11: 1–51. Diss. Utrecht: 1–51 (pg 4) Phytophthora cambivora.


from Buisman (1927)




Blepharospora cambivora Petri, Bot. Zh. SSSR (J. Bot. U.S.S.R.): 297 (1917) [MB146731]


from the Latin "cambium" and “devouring”


Type: ITALY, Torino from Castanea sativa CBS 152.24 described as Blepharospora cambivora by Petri 1917

HerIMI: IMI 38995 authentic for the name of Blepharospora cambivora Petri 1928

Ex-type: CBS 152.24 (LOST)

Well-authenticated specimen(s) selected by Gloria Abad: 
Selected specimen #1: CPHST BL 155 = P19997 (WPC)
Selected specimen #2: CPHST BL 34G = P0592 (WPC)

Selected specimen #1 in other collections

CPHST BL 155 (Abad) (A1) = P19997 (WPC)
CPHST BL 34G (Abad) (A2) = P0592 (WPC) = CBS 114087, ATCC 46719, P592 [20]

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of selected specimens (see Molecular protocols page)

Phytophthora cambivora isolate CPHST BL 155 (= P19997 WPC) = ITS rDNA MG783387, COI MH136860
Phytophthora cambivora isolate CPHST BL 34G (= P0592 WPC) = ITS rDNA MG783388, COI MH136861

Additional sequences for molecular identification

Phytophthora cambivora isolate P0592: ITS rDNA HQ261516, COI HQ261263 

Sequences for selected specimen(s) in other sources
Position in ITS phylogenetic tree

Clade 7a

Genome sequence of selected specimen

Phytophthora cambivora CBS 114087 = CPHST BL 34G = P0592 WPC

Morphological identification

Colonies and cardinal temperatures

Colonies in V-8, PDA, and MEA with no distinctive pattern. Minimum temperature for growth is 2°C, optimum is 22–24°C, and maximum 32°C.

Asexual phase

Sporangia nonpapillate, persistent, ovoid, obpyriform, or elipsoid (55–65 µm x 40–45 µm), showing internal and often nested proliferation, oroginated on simple, unbranched sporangiophores. Hyphal swellings rarely produced and are coralloid with irregular shapes. Chlamydospores are absent.

Sexual phase

Heterothallic. Oogonia showing characteristic bullate wall projections, antheridia amphygynous showing one or 2 cells when paired with the opposite mating type. Oospores plerotic.

Most typical characters

Phytophthora cambivora is heterothallic, forming oogonia with characteristic warty, or bullate walls, and 2-celled antheridia.

Specimen(s) evaluated

Selected specimen #1: Phytophthora cambivora CPHST BL 155 (A1) (Abad) = P19997 [World Phytophthora Collection (WPC) California, USA]

Selected specimen #2: Phytophthora cambivora CPHST BL 34G (A2) (Abad) = P0592 [World Phytophthora Collection (WPC) California, USA]

Hosts and distribution

Distribution: cosmopolitan
Substrate: roots, stems, especially base of trunk
Disease note: canker, crown and root rot, often in conjunction with other Phytophthora spp.
Hosts: 30 genera in 19 families, including Castanea (chestnut, Fagaceae)

Retrieved January 29, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

Fact sheet author

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