Phytophthora cocois

Name and publication

Phytophthora cocois Weir, Beever, Pennycook, Bellgard & Uchida (2015)

Weir BS, Paredes EP, Anand N, Uchida JY, Shaun R, Pennycook SEB, and Beever RE. 2015. A taxonomic revision of Phytophthora Clade 5 including two new species, Phytophthora agathidicida and P. cocois. Phytotaxa 205: 21–38 (pg. 32).

Corresponding author:  WeirB@LandcareResearch.co.nz

Nomenclature

from Weir et al. (2015)

Mycobank

MB550519

Index Fungorum

IF550519

Etymology

Latin genitive noun: cocois—of Cocos

Typification

Type: UNITED STATES OF AMERICA. Hawaii: Kauai, from diseased fruit (husk) of Cocos nucifera L., J.Y. Uchida H1024, May 1990, dried culture specimen, PDD 103199 [PDD = New Zealand Fungal and Plant Disease Fungarium (New Zealand)]

Ex-type: ICMP 16948 living culture preserved in a metabolically inactive state [ICMP = International Collection of Microorganisms from Plants (New Zealand)]

Sequences for ex-type in original manuscript: Phytophthora cocois ICMP 16948 = ITS KP295304, COX1 KP295220, YPT1 KP295423, HSP90 KP295274, L10 KP295361, ENL KP295252, ND1 KP295332, TIGA KP295390

Ex-type in other collections

ICMP 16948 = P19948 (WPC), CPHST BL 157 (Abad), 67D6 (Yang)

Molecular identification

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

Phytophthora cocois isolate CPHST BL 157 (= P19948 WPC) = ITS rDNA MG865478, COI MH136874

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

Clade 5

Morphological identification

adapted from Weir et al. (2015)

Colonies and cardinal temperatures

Colony morphology after 7 days on V8-A, PDA, MEA with no distinct pattern. Minimum growth temperature 10°C; optimum 22°C, and maximum 30°C.

Asexual phase

Sporangia are papillate, persistent, globose to ovoid (17–50 x 12–35 μm), produced in short individual sporangiophores. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia are globose (22–35 μm diam) with moderately bullate protuberances and with tapered bases; antheridia amphigynous, globose, and often strongly reflexed (bent); and oospores plerotic nearly filling the oogonia (20–30 μm diam).

Most typical characters

Phytophthora cocois is characterized by the presence of oogonia with mildly bullate ornamented walls and tapered bases formed abundantly on V8A.

Additional specimen evaluated

Phytophthora cocois ex-type CPHST BL 157, duplicate of P19948 (World Phytophthora Collection), which is a duplicate of ex-type ICMP 16948

Hosts and distribution

Distribution: Hawaii, Africa (Ivory Coast)
Substrate: fruit, leaves
Disease note: frond death, wilting, fruit rot, tree death
Host: Cocos nucifera (Arecaceae), possibly Theobroma cacao (Malvaceae)

Retrieved January 29, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

  • Phytophthora DATABASE: Phytophthora cocois
  • EPPO-Q-bank: Phytophthora cocois
  • SMML USDA-ARS: Phytophthora cocois
  • EPPO Global Database: Phytophthora cocois
  • Forest Phytophthoras of the World: Phytophthora cocois
  • CABI Invasive Species Compendium: Phytophthora cocois
  • Encyclopedia of Life (EOL): Phytophthora cocois
  • Index Fungorum (IF): Phytophthora cocois
  • Plantwise Knowledge Bank: Phytophthora cocois

Fact sheet author

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