Phytophthora rubi

Name and publication

Phytophthora rubi (Wilcox & Duncan) Man in 't Veld (2007)

Man in ’t Veld WA. 2007. Gene flow analysis demonstrates that Phytophthora fragariae var. rubi constitutes a distinct species, Phytophthora rubi comb. nov. Mycologia 99: 222–226.

Wilcox WF, Scott PH, Hamm PB, Kennedy DM, Duncan JM, Brasier CM, and Hansen EM. 1993. Identity of a Phytophthora species attacking raspberry in Europe and North America. Mycol. Res. 97 (7): 817–831 (pg. 830).

Nomenclature

Mycobank

MB505721

Synonymy

Phytophthora fragariae var. rubi W.F. Wilcox & J.M. Duncan, Mycological Research 97: 830 (1993) [MB360234]

Typification

from Wilcox et al. (1993)

Type: UNITED KINGDOM, Scotland collected from the base of a red raspberry cane Rubus idaeus in Perthshire in 1985, dried culture deposited in the herbarium at Cornell University in Ithaca, New York, USA (CUP62528)

Ex-type: R49 = NY 588 = ATCC 90442 = IMI 355974

Note from manuscript: "A type specimen, consisting of a dried culture from material originally recovered from the base of a red raspberry cane in Perthshire, Scotland, has been deposited in the herbarium at Cornell University in Ithaca, New York, USA (CUP no. 62528). Live material is maintained as a single zoospore derived culture in the collection of the Scottish Crop Research Institute (isolate number R49), the New York State Agricultural Experiment Station (isolate no. NY 588), and has been deposited with the American Type Culture Collection and the CAB International Mycological Institute."

Sequences for ex-type in Man in ’t Veld (2007): R49 COI DQ674736

Ex-type in other collections

R49 = NY 588 = ATCC 90442 = IMI 355974 = CBS 967.95, P15597 (WPC), P16899 (WPC), CPHST BL 54 (Abad), PD 10 03989803, SCRI R49, FVR 11, CH21, 46C7 (Yang)

Molecular identification

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

Phytophthora rubi isolate CPHST BL 54 (= P16899 WPC) = ITS rDNA MG865584, COI MH136976

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

Clade 7a

Morphological identification

Colonies and cardinal temperatures

Colony morphology on V-8A, PDA, and MEA with no distinctive pattern. Minimum growth temperature 4°C, optimum 19–22°C, and maximum 25–28°C.

Conditions for growth and sporulation

Gametangia produced in the vascular tissue of raspberry roots and on some agar media, sometimes more commonly in the area around the inoculum plug.

Asexual phase

Sporangia nonpapillate, persistent; ovoid, obpryriform, sometimes with tapered base (36–68 µm length x 26–44 µm width); showing internal nested and extended proliferation; originated on simple sympodial or irregular branched sporangiophores. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, globose (24–42 µm diam.) sometimes with a tapered base, becoming golden brown with age; antheridia predominantly amphigynous, short cylindrical, ovoid, or irregular (8–17µm), sometimes producing digitated projections; oospores aplerotic (19–40 µm diam.).

Additonal specimen(s) evaluated

Phytophthora rubi ex-type CPHST BL 54 = P16899 (World Phytophthora Collection)

WPC P15597

Hosts and distribution

Distribution: cosmopolitan (Erwin & Ribeiro 1996)
Substrate: roots
Disease note: root rot; one of the most important diseases of red raspberries (Erwin & Ribeiro 1996)
Host: Rubus idaeus var. idaeus (Rosaceae)

Retrieved February 01, 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