Name and publication
Phytophthora primulae Toml. (1952)
Tomlinson JA. 1952. Brown core root rot of Primula caused by Phytophthora primulae n. sp. T. Brit. Mycol. Soc. 35: 221–235.
named for the species from which it was first isolated
from Tomlinson (1958)
Type: UNITED KINGDOM (ENGLAND) isolated from roots of Primula polyantha Mill. causing a stele discoloration and root rot; holotype deposited at the Herbarium Plant Pathology Laboratory, Harpenden, Herts, no. 965, type
Well-authenticated specimen(s) selected by Gloria Abad:
Selected specimen #1: Phytophthora primulae CPHST BL 148 = P10703 (WPC) New Zealand from Primulax polyantha Hort.
Selected specimen #2: Phytophthora primulae CPHST BL 50 = P10333 (WPC) Germany from Primula acaulis
Selected specimen #1 in other collections
Voucher sequences for barcoding genes (ITS rDNA and COI) of selected specimens (see Molecular protocols page)
Sequences for selected specimens in other sources
- NCBI: Phytophthora primulae CPHST BL 148
- NCBI: Phytophthora primulae CBS 114346
- Phytophthora Database: Phytophthora primulae
- EPPO-Q-bank: Phytophthora primulae CBS 114346
- BOLDSYSTEMS: Phytophthora primulae (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology on PDA, V8A, MEA with non-distinct pattern. Minimum growth temperature 3°C, optimum 15–21°C, and maximum 27°C.
Conditions for growth and sporulation
Hyphal swellings formed in agar or in soil water extract.
Sporangia nonpapillate; persistent; ellipsoid, obpyriform, ovoid, or with irregular shapes (33–109 L x 13–39 W µm), many times showing typical constrictions, and sometimes with tapered bases; no internal proliferation is observed but external proliferation originating secondary sporangia is occasionally observed; sporangia mostly originated on unbranched sporangiophores which often present basal and intercalary swellings. Hyphal swellings globose, elongate, or irregular; solitary, catenulated or toruloid kind and clustered; many times with radiating hyphae. Chlamydospores absent.
Homothallic. Oogonia smooth-walled; spherical to subglobose (20–50 µm diam); antheridia predominantly paragynous and sometimes amphigynous, spherical, ovoid, club-shaped or irregular shape, sometimes with wide antheridial hyphae; oospores aplerotic to slightly aplerotic (17–40 µm diam). Many aborted oospores are observed.
Most typical characters
Phytophthora primulae CPHST BL 148, duplicate of P10703 (World Phytophthora Collection)
Hosts and distribution
Distribution: Europe (UK, Denmark), New Zealand
Disease note: brown core root rot
Host: Primula spp. (Primulaceae)
Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.
USA: This species was listed as a species of concern during the 2009 Phytophthora prioritization project conducted by USDA APHIS PPQ CPHST PERAL (Schwartzburg et al.).
Additional references and links
- Phytophthora DATABASE: Phytophthora primulae
- EPPO-Q-bank: Phytophthora primulae
- SMML USDA-ARS: Phytophthora primulae
- EPPO Global Database: Phytophthora primulae
- CABI Invasive Species Compendium: Phytophthora primulae
- Encyclopedia of Life (EOL): Phytophthora primulae
- Index Fungorum (IF): Phytophthora primulae
- Plantwise Knowledge Bank: Phytophthora primulae
- Google All Phytophthora primulae
- Google Images Phytophthora primulae
- Google Scholar Phytophthora primulae
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America