Phytophthora pistaciae

Name and publication

Phytophthora pistaciae Mirabolfathy (2001)

Mirabolfathy M, Cooke DEL, Duncan JM, Williams NA, Ershad D, and Alizadeh A. 2001. Phytophthora pistaciae sp. nov. and P. melonis: the principal causes of pistachio gummosis in Iran. Mycol. Res. 105: 1166–1175.

Corresponding author:


from Mirabolfathy et al. (2001)




named after its only known host Pistacia vera


Type: IRAN, Kerman Province, Ferdosieh, Nogh, Rafsanjan, isolated from Pistachia vera, 1986, collector unknown, PIS16 (IMI 386658 holotypus)

Ex-type: P19883 (= PIS16 = SCRP 533)

Ex-type in other collections

IMI 386658 = P19883 (WPC) = ATCC MYA-4082 [p216 (SCRP 533, 33D6)], CPHST BL 99 (Abad), 33D6 (Yang)

Molecular identification

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

Phytophthora pistaciae isolate ATCC MYA-4082 ITS rDNA FJ746648

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

Clade 7b

Morphological identification

adapted from Mirabolfathy et al (2001)

Colonies and cardinal temperatures

Colony morphology on PDA, V8A, MEA with no distinct pattern. Minimum growth temperature 9°C, optimum 27°C, and maximum 33°C.

Asexual phase

Sporangia nonpapillate; persistent; ellipsoid, ovoid, obpyriform, pyriform (41–75 L x 18–34 W µm), mostly with tapered base; showing internal proliferation (nested) and originated in unbranched sporangiophores. Hyphal swellings globose or subglobose with radiating hyphae. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled (25–44 µm diam), antheridia predominantly paragynous, spherical, ovoid, ellipsoid; showing knotted hyphae or digital projections; oospores aplerotic (21–33 µm diam).

Most typical characters

Phytophthora pistaciae is characterized by the presence of homothallic oogonia with antheridia radiating knotted hyphae and the presence of globose or subglobose hyphal swellings with radiating hyphae.

Additional specimen(s) evaluated

Phytophthora pistaciae ex-type CPHST BL 99 = P19883 (World Phytophthora Collection)

Hosts and distribution

Distribution: Asia (Iran, type)
Substrate: roots, crown, soil
Disease note: associated with gummosis
Host: Pistacia vera (pistachio, Anacardiaceae)

Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional info:
Substrate: trunk

Quarantine status

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

Fact sheet author

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