Phytophthora lactucae

Name and publication

Phytophthora lactucae Bertier, Brouwer & de Cock (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: eb.tnegu@etfoh.acinom


from Bertier et al. (2013)




named after the host plant, Lactuca sativa (lettuce)


Type: GREECE, Marathon, Attika, collected from stem of Lactuca sativa cv. Paris Island Cos, by L. Elena in 2001, holotype CBS H-21129 (dried culture)

Ex-type: culture BPIC 1985

Sequences for ex-type in original manuscript: BPIC 1985 = ITS KC478768, Cox1 KC478738

Ex-type in other collections

BPIC 1985 = P19872 (WPC), P19875 (WOC/WPC), CPHST BL 113 (Abad), 61F4 (Yang)

Molecular identification

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

Phytophthora lactucae isolate BPIC 1985 ITS rDNA KC478768

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 0°C, optimum 18°C, and maximum 24°C.

Asexual phase

Sporangia semipapillate, persistent, ovoid, ellipsoid, slightly obpyriform and asymmetrical shapes, some with tapered bases (28–101 × 18–54 μm) originated in unbranched sporangiophores. Hyphal swellings occur in sparse clusters and are globose to somewhat angular or irregular in shape. Chlamydospores are rarely produced and are globose and intercalary.

Sexual phase

Homothallic. Oogonia smooth-walled and globose (22–44.1 × 21–44.1 μm); antheridia predominantly paragynous, but some amphigynous antheridia occur; oospore aplerotic (19–38.7 μm).

Additional specimen(s) evaluated

Phytophthora lactucae ex-type CPHST BL 113, duplicate of P19875 (World Phytophthora Collection), which is a duplicate of ex-type BPIC 1985

Hosts and distribution

Distribution: Europe (Greece)
Substrate: isolated from stem
Host: Lactuca sativa (Asteraceae)

Retrieved January 31, 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