Phytophthora niederhauserii

Name and publication

Phytophthora niederhauserii Z.G. Abad & J.A. Abad (2014)

Abad ZG, Abad JA, Cacciola SO, Pane A, Faedda R, Moralejo E, Pérez-Sierra A, Abad-Campos P, Alvarez-Bernaola LA, Bakonyi J, Józsa A, Herrero MA, Burgess TI, Cunnington JH, Smith IW, Balci Y, Blomquist C, Henricot B, Denton G, Spies C, Mcleod A, Belbahri L, Cooke D, Kageyama K, Uematsu S, Kurbetli I, and Degĭrmenci K. 2014. Phytophthora niederhauserii sp. nov., a polyphagous species associated with ornamentals, fruit trees, and native plants in 13 countries. Mycologia 106 (3): 431–447.

Corresponding author:


from Abad et al. (2014)




named to honor Dr John Niederhauser, winner of the 1990 World Food Prize and best known in the scientific community for his research to control the potato late-blight pathogen Phytophthora infestans (Mont.) de Bary


Type: UNITED STATES OF AMERICA, collected from English ivy (Hedera helix L.) affected with collar and root rot from a greenhouse in Henderson, North Carolina on 10 Oct 2001, collector Z. Gloria Abad, WPC_P10616 ‘‘preserved in a permanent inactive state,’’ cryopreserved in liquid nitrogen at the World Oomycetes/Phytophthora Genetic Resource Collection, Univ. of California

Ex-type: P10616 (WPC) = Ph289 and PPIL 01.6056

Sequences for ex-type in original manuscript: PPIL 01.6056 = ITS AY550915. P10616 (WPC) = β-tub EU080230, EF-1α EU080231

Ex-type in other collections

P10616 (WPC) = CPHST BL 45 (Abad)

Molecular identification

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

Phytophthora niederhauserii isolate CPHST BL 45 (= P10616 WPC) = ITS rDNA MG865552, COI MH136944

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

Clade 7b

Morphological identification

Colonies and cardinal temperatures

Colony morphology on V-8 agar and potato dextrose agar with no distinct pattern, on malt extract agar with compressed mycelia. Minimum temperature for growth 10°C, optimum 30°C, maximum 37°C.

Conditions for growth and sporulation

Sporangia and hyphal swellings readily produced in media and liquid cultures; oospores were produced in pairings with Phytophthora cryptogea A2.

Asexual phase

Sporangia nonpapillate; persistent; ellipsoid, obpyriform, ovoid, or irregular (56–112 L x 32–52 W µm), proliferating internally with both nested and extended proliferation; sporangia originated in single or simple sympodial or rarely branched sporangiophores. Hyphal swellings toruloid to lobate and irregularly branched. Chlamydospores absent.

Sexual phase

Heterothallic. Oogonia spherical (24–40 µm diam.), some with funnel shape or long bases; antheridia amphigynous, some with lobes that are frequently asymmetrical around the oogonia stalk (giving the appearance of being paragynous), some elongated; oospores plerotic or slightly aplerotic (25–38 µm diam.).

Most typical characters

Phytophthora niederhauserii is characterized by typical toruloid hyphal swellings and the shape of the ellipsoid sporangia.

Specimen(s) evaluated

Phytophthora niederhauserii ex-type CPHST BL 45, duplicate of ex-type P10616 (World Phytophthora Collection)

Hosts and distribution

Distribution: widespread
Substrate: all plant parts
Disease note: rots, chlorosis, wilting, cankers, leaf blight, etc.
Host: numerous hosts, but especially Hedera helix (Araliaceae) and Cistus salvifolius (Cistaceae)

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

Additional references and links

Fact sheet author

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