Name and publication
Phytophthora tropicalis Aragaki & Uchida (2001)
Aragaki M and Uchida JY. 2001. Morphological distinctions between Phytophthora capsici and P. tropicalis sp. nov. Mycologia 93: 137–145.
Corresponding author: firstname.lastname@example.org
from Aragaki and Uchida (2001)
Type: UNITED STATES OF AMERICA collected from macadamia raceme (Macadamia integrifolia) inflorescence on Macadamia orchard at Keaau, island of Hawaii by M. Aragaki (isolate H245) on 23 January 1975 (HOLOTYPE, CBS, dried culture of CBS 434.91)
Ex-type: CBS 434.91
Ex-type in other collections
Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)
Sequences for ex-type in other sources
- NCBI: Phytophthora tropicalis CPHST BL 58
- NCBI: Phytophthora tropicalis P10329
- NCBI: Phytophthora tropicalis CBS 434.91
- Phytophthora Database: Phytophthora tropicaliis PD_00020 (= P10329)
- EPPO-Q-bank: Phytophthora tropicalis CBS 434.91
- BOLDSYSTEMS: Phytophthora tropicalis OOMYA159-07 [COI-5P:680, ITS:752] = CBS 434.91, OOMYA551-08 [ITS:2233] = CBS 434.91 (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology on PDA and MEA with chrysanthemum shape, on V-8A with no distinctive pattern or light chrysanthemum. Minimum temperature for growth 6°C, optimum 27–30°C, and maximum 33°C.
Conditions for growth and sporulation
Sporangia produced on agar and liquid cultures.
Sporangia papillate; caducous with long, often curved pedicels: ovoid, oboviod, pyriform, ellipsoidal, or distorted shapes (18–63 µm length x 13–36 µm width), with tapered bases; originated on simple sympodial or umbellate sporangiphores. Hyphal swellings absent. Chlamydospores globose or subglobose (20–33 µm diam.), terminal or intercalary.
Heterothallic. Oogonia smooth-walled, spherical (27–39 µm diam.); antheridia amphigynous, spherical, short cylindrical, or ovoid (13 x 16 µm diam.), sometimes with digitate projections; oospores plerotic, or slightly aplerotic, spherical (22–36 µm diam.) and thick-walled.
Most typical characters
Phytophthora tropicalis can be differentiated from P. capsici and other species except P. morindae in the production of umbellate sporangiophores and the shape of the caducous sporangia with long pedicels.
Phytophthora tropicalis ex-type CPHST BL 58, duplicate of P10329 (World Phytophthora Collection)
Hosts and distribution
Distribution: Pacific Islands (USA: HI); also reported from North America (USA: VA) and Europe (the Netherlands). This species may have been reported before 2001 as Phytophthora capsici; therefore, the full geographic distribution is unclear.
Substrate: leaves, stems, shoots
Disease note: wilt, dieback, shoot death
Host: 14 genera in 12 families
Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.
Additional references and links
- Phytophthora DATABASE: Phytophthora tropicalis
- EPPO-Q-bank: Phytophthora tropicalis
- SMML USDA-ARS: Phytophthora tropicalis
- EPPO Global Database: Phytophthora tropicalis
- CABI Invasive Species Compendium: Phytophthora tropicalis
- Encyclopedia of Life (EOL): Phytophthora tropicalis
- Index Fungorum: Phytophthora tropicalis
- Plantwise Knowledge Bank: Phytophthora topicalis
- Google All Phytophthora tropicalis
- Google Images Phytophthora tropicalis
- Google Scholar Phytophthora tropicalis
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America