from Ko and Ann (1985)
Latin, humicola (soil inhabiting), referring to the native environment from where the type was found
Type: TAIWAN, from soil, citrus grove, TAI 9017, dried culture preserved at Herbarium of Department of Botany, National Taiwan University, Taipei
Ex-type in other collections
Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)
Sequences for ex-type in other sources
- NCBI: Phytophthora humicola CPHST BL 42G
- NCBI: Phytophthora humicola P3826
- NCBI: Phytophthora humicola CBS 200.81
- Phytophthora DATABASE: Phytophthora humicola PD_00018 = P3826 (WPC)
- EPPO-Q-bank: Phytophthora humicola CBS 200.81
- BOLDSYSTEMS: Phytophthora humicola OOMYA038.07 (COI-5P:680, ITS:815) = CBS 200.81; OOMYA516.08 (ITS:2296); = CBS 200.81; PHYTO177-10 (COI-5P:680, ITS:816) = P3826 (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology after 7 days of growth on V8-A, PDA, and MEA with light petaloid pattern. The minimum temperature for growth is 9°C, optimum 28–30°C, and maximum 32°C.
Conditions for growth and sporulation
Sporangia nonpapillate; persistent; ovoid, obpyriform (36–72 L x 30–52 W µm); presenting internal proliferation and sometimes with external proliferation; some sporangia with basal swellings; originated from unbranched sporangiophores and sometimes on the tips of hyphae radiating from germinating hyphal swellings. Hyphal swellings large, spherical (22–56 µm diam) with radiating hyphae, sometimes the dominant hypha produces another hyphal swelling and forms a chain of hyphal swellings. Chlamydospores absent.
Homothallic. Oogonia smooth-walled; spherical (21–49 µm diam) with long oogonial stalks; antheridia paragynous and amphigynous, short cylindrical, spherical, ellipsoid or ovoid, and irregular shapes (9–16 µm W), some with digitate projections, and some oogonia with 2 or more antheridia; oopores aplerotic or slightly aplerotic (16–41 µm diam).
Most typical characters
Hosts and distribution
Distribution: Asia (Taiwan, type), Europe
Substrate: soil; able to infect fruits, roots, leaves
Disease note: Pathogenic to apple and cucumber, but not orange or eggplant, after wound inoculation.
Hosts: Citrus spp., soil. Natural host unknown, but isolated from a Citrus sp. orchard (Rutaceae). Inoculated hosts include Malus domestica (apple, Rosaceae) and Cucumis sativus (cucumber, Cucurbitaceae).
Retrieved January 31, 2018 from U.S. National Fungus Collections Nomenclature Database.
Additional references and links
Ginetti B, Uccello A, Bracalini M, Ragazzi A, Jung T, and Moricca S. 2012. Root rot and dieback of Pinus pinea caused by Phytophthora humicola in Tuscany, central Italy. Plant Disease 96 (11): 1694. DOI: 10.1094/PDIS-05-12-0451-PDN.
Ko WH and Ann PJ. 1985. Phytophthora humicola, a new species from soil of a citrus orchard in Taiwan. Mycologia 77 (4): 631–636.
- Phytophthora DATABASE: Phytophthora humicola
- EPPO-Q-bank: Phytophthora humicola
- SMML USDA-ARS: Phytophthora humicola
- EPPO Global Database: Phytophthora humicola
- Forest Phytophthoras of the World: Phytophthora humicola
- CABI Invasive Species Compendium: Phytophthora humicola
- Encyclopedia of Life (EOL): Phytophthora humicola
- Index Fungorum (IF): Phytophthora humicola
- Plantwise Knowledge Bank: Phytophthora humicola
- Google All Phytophthora humicola
- Google Images Phytophthora humicola
- Google Scholar Phytophthora humicola
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America