Name and publication
Phytophthora emzansi T. Bose, T. Paap, and J.M. Hulbert (2021)
Bose T, Hulbert JM, Burgess TI, Paap T, Roets F, Wingfield MJ. 2021. Two novel Phytophthora species from the southern tip of Africa. Mycological Progress 20 (6): 755–767.
name derived from the Zulu word for south or from the south
Type: SOUTH AFRICA, Knysna Forest, Western Cape Province, from rhizosphere soil of Afrocarpus falcatus (− 33.93149201, 22.62277904), November 2017, JM Hulbert, holotype PREM63081
Ex-type: culture PPRI 28451 = CMW 54354 = CBS 147464
Sequences of ex-type in manuscript: ITS MT762301, ß-tubulin MT762318, HSP90 MT762327, coxI MT762309
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology cottony with no distinct pattern on MEA, CA, V8A and PDA. Minimum growth temperature 4°C, optimum 20°C, and maximum 30°C.
Conditions for growth and sporulation
Sporangia were semi-papillate, persistent, and predominantly ovoid in shape with no proliferation. Sporangia averaged 26.7 x 23.9 µm (overall range 25–68.3 x 17.5–41.5 µm); Sporangiophores simple or loose sympodia. Hyphal swellings present. Chlamydospores absent.
Homothallic. Oogonia had smooth walls and size ranged from 18.8–49.9 µm. Oospores plerotic, globose often with a tapering base and light golden brown on maturity, size ranged 18.2–46.7 µm. Oospores often aborted after formation of the walls. Antheridia amphigynous.
Most typical characters
Additional specimen(s) evaluated
South Africa, Knysna Forest, Western Cape Province, from rhizosphere soil of Afrocarpus falcatus, 2017, JM Hulbert, CBS 147464; CBS 147466; 2019, CMW 54569; Eerste River, 2016, CBS 147465; from rhizosphere soil of Rapanea melanophloeos, 2019, CMW 54577; Western Cape Province, from rhizosphere soil of Podocarpus elongata, 2016, T Paap – CMW50975; Agathosma betulina, 2005, K Lubbe, STE-U 6269 (= WPC P15619, CMW 56071); STE-U 6272 (= WPC P19574, CMW 56072)
Hosts and distribution
Distribution: South Africa
Disease note: no diseases recorded
Hosts: Agathosma betulina, asymptomatically from rhizosphere soil in natural vegetation
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University