Phytophthora cichorii

Name and publication

Phytophthora cichorii Bertier, Brouwer, De Cock & Cooke (2013)

Bertier L, Brouwer H, de Cock AWAM, Cooke DEL, Olsson CHB, and Höfte M. 2013. The expansion of Phytophthora clade 8b: three new species associated with winter grown vegetable crops. Persoonia 31: 63–76.

Corresponding author e-mail:


from Bertier et al. (2013)




named after the host plant, Cichorium intybus (chicory)


Type: THE NETHERLANDS, from root of Cichorium intybus var. foliosum, 2004, holotype Herb. CBS H-21127 (dried culture)

Ex-type: CBS 115029 (deposited as culture ex-holotype)

NOTE: Isolate CBS 115029 produced oogonia in a polycarbonate filter-separated mating setup with Phytophthora capsici CBS 128.23, a strain of A2 mating type.

Sequences for ex-type in original manuscript: Phytophthora cichorii CBS 115029 = ITS KC478773, Cox1 KC478743

Ex-type in other collections

CBS 115029 = P19844 (WPC), ADC 04.07, CM-C, CPHST BL 95 (Abad), 62A8 (Yang)

Selected specimens and sequences (from original paper)
  • CBS 114345Cichorium intybus Netherlands 2003: ITS KC478774, Cox1 KC478744 
  • CBS 115030 Cichorium intybus Netherlands 2004: ITS KC478775, Cox1 KC478745 
  • CBS 133815 SCRACE5388 Cichorium intybus UK 1999: ITS KC478776, Cox 1 KC478746 

Molecular identification

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

Phytophthora cichorii isolate CBS 115029 = ITS rDNA KC478773

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

Clade 8b

Morphological identification

adapted from Bertier et al. (2013)

Colonies and cardinal temperatures

Colonies on CMA, V8, and PDA with no distinctive colony pattern. Minimum temperature for growth 5°C, optimum 21°C, and maximum 27°C.

Asexual phase

Sporangia semipapillate, predominantly persistent, ovoid, obpyriform, sometimes with distorted shapes or constrictions (30.6–142.9 × 20.7–63.1 μm, av 69.0–74.9 × 37.5–42.0 μm). Sporangia with elongated necks and bipapillate occur occasionally. Larger sporangia with distorted shapes are rarely observed. Sporangia often had thick basal plugs. Sporangia born in simple sympodial or irregular branched sporangiophores. Hyphal swellings are subglobose, elongate, and intercalary. Chlamydospores absent.

Sexual phase

Heterothallic. Oogonia smooth-walled, antheridia amphigynous, often 2-celled, oospores aplerotic to almost plerotic (av. 27.5 ± 2.4 μm wide).

Most typical characters

Phytophthora cichorii can be distinguished from related species morphologically by its heterothallic mating behavior and the occurrence of 2-celled antheridia, and molecularly by ITS and cox1 sequence data.

Additional specimen(s) evaluated

Phytophthora cichorii CPHST BL 95 duplicate of P19844 (World Phytophthora Collection) duplicate of ex-type CBS 115029

Hosts and distribution

Distribution: Europe (Great Britain, Netherlands)
Substrate: isolated from roots
Hosts: Cichorium intybus (Asteraceae)

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