Phytophthora heveae

Name and publication

Phytophthora heveae A.W. Thomps. (1929)

Thompson A. 1929. Phytophthora species in Malaya. Malayan Agric. J. 17: 53–100.

Nomenclature

Mycobank

MB252580

Synonymy

Phytophthora palmivora var. heveae (A.W. Thomps.) Orellana, Phytopathology 49: 213 (1959) [MB352396]

Typification

from Thompson (1929)

Type: MALAYSIA, from pod rot of rubber (Hevea brasiliensis), collected in Selangor in December 1927 by Thompson (No 5). Isotype: CBS H-7641

Ex-type: CBS 296.29

Ex-type in other collections

CBS 296.29 = P3428 (WOC/WPC), CPHST BL 67 (Abad), ATCC 58815, IMI 180616 (as P. palmivora), ICMP 19451, KACC 44943, 22J1 (Yang)

Molecular identification

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

Phytophthora heveae isolate CPHST BL 67 (= P3428 WPC) ITS rDNA MG865505, COI MH136899

Sequences for ex-type in other sources
Position in ITS phylogenetic tree

Clade 5

Morphological identification

Colonies and cardinal temperatures

Cultures on V8-A and PDA with no distinctive pattern and on MEA with light stellate pattern. Minimum temperature for growth 9°C, optimum 24°C, maximum 27°C.

Conditions for growth and sporulation

Sporangia and oospores freely formed in culture media and water cultures.

Asexual phase

Sporangia papillate, persistent or caducous with short to medium pedicel up to 10 µm long, with variable shapes including ovoid to obpyriform, ellipsoid, irregular (mainly asymetrical in shape) (27–66 L x 20–49 W µm), often with elongated necks and formed frequently laterally on the stalk; originated in simple sympodial sporangiophores. Hyphal swellings globose to subglobose, found in sporulating water cultures. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia spherical with broadly funnel shape (tapering base) (25–35 x 28–32 µm); antheridia amphigynous, spherical, ellipsoid or ovoid (small 7–13 µm), and occasionally with one or more short spines; oospores aplerotic, wall 3 µm thick.

Most typical characters

Phytophthora heveae is characterized by the presence of oogonia with broadly funnel shape (tapering base).

Specimen(s) evaluated

Phytophthora heveae, ex-type CPHST BL 67, duplicate of P3428 (World Phytophthora Collection)

P10167 World Phytophthora Collection (WPC) selected specimen

Hosts and distribution

Distribution: Asia, Australia, North America (USA: NC, TN), South America (Brazil)
Substrate: roots, leaves, buds, seeds, pods, stems
Disease note: rot, leaf blight and stem canker. Disease symptoms on crop species include black stripe of rubber, bud rot and nut fall of coconut, and dieback of rhododendron.
Hosts: multiple hosts, fruits/roots; 12 genera in 11 families including Hevea brasiliensis (Euphorbiaceae) Rhododendron (Ericaceae) and Cocos nucifera (Arecaceae)

Retrieved January 31, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

Weir, B.S., Paredes E.P., Anand N., Uchida J.Y., Shaun R., Pnnycook S.E.B., and Beever R.E. 2015. A taxonomic revision of Phytophthora Clade 5 including two new species, Phytophthora agathidicida and Phytophthora cocois. Phytotaxa 205: 21-38.

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America