Name and publication
Phytophthora urerae GA Forbes & NJ Grünwald (2019)
Grünwald NJ, Forbes GA, Perez‐Barrera W, Stewart JE, Fieland VJ, Larsen MM. 2019. Phytophthora urerae sp. nov., a new clade 1c relative of the Irish famine pathogen Phytophthora infestans from South America. Plant Pathology 68 (3): 557–65.
referring to the host plant Urera laciniata from which it was first isolated and which was validated as a host plant following Koch’s postulates
Type: Peru, San Ramon, Junin, isolated from plant host Urera laciniata in Peru, Collected by W. Perez-Barrera, holotype BPI893220
Ex-type: culture PSR27
Sequences for ex-type in original manuscript: PSR27; ITS KR632862, cox1 KR632858, PITG11126 KR632939, ypt1 KR632913, β-tubulin KR632888
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colonies smooth to slightly stellate on rye B and V8A, and appeared cottony and petallate to stellate on PDA. Minimum growth temperature 6°C, optimum 20–25°C, and maximum 28°C.
Conditions for growth and sporulation
Sporangia were semi-papillate to papillate, caducous, and predominantly ellipsoid in shape. Sporangia averaged 30 x 18 µm (overall range 20–36 x 14–22 µm). Hyphal swellings absent. Chlamydospores absent.
Most typical characters
Morphologically similar to other species in Clade 1c. Can be distinguished as it can only cause symptoms on a single host Urera laciniata.
Additional specimen(s) evaluated
Peru, San Ramon, Junin, foliage of Urera laciniata, collected by W. Perez-Barrera, PSR26; PSR28; PSR29; PSR30; PSR31
Hosts and distribution
Disease note: foliar blight on leaves of native plant Urera laciniata in Peru
Host: Urera laciniata
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University