Name and publication
Phytophthora cathayensis C. Morales-Rodríguez, Y. Wang & A. Vannini, sp. nov. (2021)
Morales-Rodríguez C, Wang Y, Martignoni D, Vannini A. 2021. Phytophthora cathayensis sp. nov., a new species pathogenic to Chinese Hickory (Carya cathayensis) in southeast China. Fungal Systematics and Evolution 7 (1): 99–111.
name refers to Carya cathayensis, the host plant from which all isolates were obtained
Type: CHINA, Zhejiang, Hangzhou, Lina, Tuankou, isolated from small pieces of cambium and adjacent xylem tissue from Carya cathayensis tree with collar canker, 2017, C. Morales-Rodríguez; CGMCC No. 19655 (preserved as metabolically inactive culture, China General Microbial Culture Collection, CGMCC No. 19655)
Ex-type: CP30 = CGMCC No. 19655
Sequences of Ex-type in manuscript: ITS MN385741, cox1 MN692211, ß-tubulin MT063102, HSP90 MT063109
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology stellate on MEA, stoloniferous felty colonies on PDA, and uniform on V8A. Minimum growth temperature 7.5°C, optimum 25°C, and maximum 30°C.
Conditions for growth and sporulation
Sporangia were papillate, persistent, and predominantly ovoid in shape. Sporangia averaged 27.3 x 18.6 µm (overall range 28–85 x 21–50 µm). Sporangiophores simple.Hyphal swellings present. Chlamydospores present, rare.
Most typical characters
Morphologically similar to other species in Clade 4. A single isolate from the USA recovered from pecans, informally known as P. sp. pecan has identical sequence to P. cathayensis.
Additional specimen(s) evaluated
CHINA, Zhejiang, Hangzhou, Lina, Tuankou, isolated from small pieces of cambium and adjacent xylem tissue from Carya cathayensis tree with collar canker, 2017, C. Morales-Rodríguez, CP29; CP31
Hosts and distribution
Substrate: tree collar
Disease note: trunk lesions of Carya cathayensis leading to a severe decline and dieback
Host: Carya cathayensis
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University