Name and publication
Phytophthora phaseoli Thaxt. (1889)
Thaxter R. 1889. A new American Phytophthora. Bot. Gaz. 14: 273–274. Phytophthora phaseoli.
from Thaxter (1889)
Type: UNITED STATES OF AMERICA, collected from lima beans (Phaseolus lunatus) in the vicinity of New Haven, Connecticut in September 1889 on pods, stems, and leaves of the lima bean
Well-authenticated specimen(s) selected by Gloria Abad:
Selected specimen #1: CPHST BL 28 = P10150 (WPC) from Phaseolus lunatus in Delaware, Race F, UNITED STATES OF AMERICA
Selected specimen #2: CPHST BL 112 = P6609 (WPC) from Phaseolus lunatus in Maryland, Race C, UNITED STATES OF AMERICA
Selected specimen(s) in other collections
Voucher sequences for barcoding genes (ITS rDNA and COI) of selected specimens (see Molecular protocols page)
Sequences for selected specimen(s) in other sources
- NCBI: Phytophthora phaseoli CPHST BL 28
- NCBI: Phytophthora phaseoli P6609
- Phytophthora Database: Phytophthora phaseoli PD_00140 (= P6609)
- EPPO-Q-bank: Phytophthora phaseoli CBS 114106
- BOLDSYSTEMS: Phytophthora phaseoli (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colonies after 7 days of growth on V8 agar, potato dextrose agar, and malt extract agar with slow growth and no special pattern. Minimum temperature for growth is 9°C, optimum 15–20°C, and maximum 27°C.
Conditions for growth and sporulation
Sporangia semipapillate; caducous with short pedicels (5–20 µm L); ovoid, ellipsoid, obovoid, or irregular and some with tapered bases (18–54 µm L x 11–27 µm W); nonproliferating; originated in simple sympodial sporangiophores which are slightly swollen at the base of sporangium. Hyphal swellings absent. Chlamydospores absent.
Homothallic. Oogonia smooth-walled, subspherical (17–36 µm diam.); antheridia predominantly amphigynous, elongated cylindrical, spherical, ellipsoid, or ovoid (7–19 µm L), and sometimes with digitate projections; oospores aplerotic (13–27 µm diam.).
Phytophthora phaseoli CPHST BL 28 SE1 = P10150 (WPC)
Phytophthora phaseoli CPHST BL 112 SE2 = P6609 (WPC)
Hosts and distribution
Distribution: Africa (Congo, Zaire), Asia (Philippines, Sri Lanka, Russia), Europe (Italy, Romania), North America (Mexico, USA), Central America and Caribbean Islands, South America (Brazil)
Substrate: pods. Also on shoots, leaves, petioles. Overwinters in soil or infected plant debris.
Disease note: downy mildew. At least 6 races have been identified. Races D, E, F have recently caused serious outbreaks in the eastern USA (DE, MD).
Host: Phaseolus lunatus (also reported as P. limensis) (lima beans, Fabaceae). Capable of infecting plants from other families after inoculation (Erwin & Ribeiro 1996). Also reported from Phaseolus vulgaris (common bean).
Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.
Additional references and links
- Phytophthora DATABASE: Phytophthora phaseoli
- EPPO-Q-bank: Phytophthora phaseoli
- SMML USDA-ARS: Phytophthora phaseoli
- EPPO Global Database: Phytophthora phaseoli
- CABI Invasive Species Compendium: Phytophthora phaseoli
- Encyclopedia of Life (EOL): Phytophthora phaseoli
- Index Fungorum (IF): Phytophthora phaseoli
- Plantwise Knowledge Bank: Phytophthora phaseoli
- Google All Phytophthora phaseoli
- Google Images Phytophthora phaseoli
- Google Scholar Phytophthora phaseoli
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America