Phytophthora betacei

Name and publication

Phytophthora betacei Mideros, L.E. Lagos & S. Restrepo (2018)

Mideros MF, Turissini DA, Guayazán N, Ibarra-Avila H, Danies G, Cárdenas M, Myers K, Tabima J, Goss EM, Bernal A, Lagos LE. 2018. Phytophthora betacei, a new species within Phytophthora clade 1c causing late blight on Solanum betaceum in Colombia. Persoonia-Molecular Phylogeny and Evolution of Fungi 41 (1): 39–55.





name refers to Solanum betaceum, the host plant from which the isolates were obtained


Type: COLOMBIA, Putumayo, Colon, San Pedro locality, isolated from small pieces of infected leaves from S. betaceum plants, 2008, M.F. Mideros, Andes-F 1172 holotype, culture on TTA

Ex-type: culture MFM-P8084

Sequences of Ex-type in manuscript: whole genome JAANHX000000000.1

Molecular identification

Position in ITS phylogenetic tree

Clade 1c

Morphological identification

Colonies and cardinal temperatures

Colony morphology fluffy and uniform on V8A and limited growth on PDA. Minimum growth temperature 10°C, optimum 20°C, and maximum 25°C.

Conditions for growth and sporulation

Sporangia produced on V8A after 2 weeks in the dark at 20°C. Oogonia rarely formed in paired cultures on V8-rye agar after 15-30 days.

Asexual phase

Sporangia were non to semi-papillate, caducous, and predominantly limoniform in shape with external proliferation close to the sporangial base. Sporangia averaged 36 x 17 µm (overall range 24–40.5 x 12–23 µm).Sporangiophores simple. Hyphal swellings present. Chlamydospores absent.

Sexual phase

Heterothallic. Oogonia smooth-walled, size ranged from 22–26 µm. Oospores plerotic. 60-80% of oospores aborted before the formation of walls. Antheridia amphigynous.

Most typical characters

Morphologically similar to other species in Clade 1c but exhibits a host preference for Solanum betaceum (tree tomato).

Hosts and distribution

Distribution: Colombia, Equador, Peru
Substrate: leaves
Disease note: late blight of Solanum betaceum which can lead to death of the plants and complete loss of the crop
Host: Solanum betaceum

Additional references and links

none available

Fact sheet author

Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University