Name and publication
Phytophthora capsici Leonian (1922)
Leonian LH. 1922. Stem and fruit blight of pepper caused by Phytophthora capsici species nov. Phytopathology 12: 401–408.
from Leonian (1922)
≡ Phytophthora parasitica var. capsici (Leonian) Sarej., Annales de l'Institut Phytopathologique Benaki 2: 44 (1936) [MB353070]
= Phytophthora hydrophila Curzi, Riv. Patol. veg.: 1 (1927) [MB267501]
Type: UNITED STATES OF AMERICA, parasitic on stems and fruit of chile pepper (Capsicum annuum), State College, New Mexico. L. H. Leonian 1919
Ex-type: CBS 128.23 (deposited by Leonian in 1923) (A2 Type)
Ex-type in other collections
NOTE: IMI 40502 The Netherlands??
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 capsici CPHST BL 33G
- NCBI: Phytophthora capsici P3605
- NCBI: Phytophthora capsici P1091
- NCBI: Phytophthora capsici CBS 128.23
- Phytophthora DATABASE: Phytophthora capsici PD_01677 (= P3605 WPC); PD_01938 (= P1091 WPC)
- EPPO-Q-bank: Phytophthora capsici CBS 128.23
- BOLDSYSTEMS: Phytophthora capsici OOMYA012-07 (= CBS 128.23), OOMYA490-08 (= CBS 128.23), PHYTO172-10 (= P3605) (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colonies in V8-A, PDA, and MEA with no distinct pattern to light chrysanthemum pattern. Minimum temperature for growth is 6°C, optimum is 27°C, and maximum 33°C.
Sporangia are papillate and semipapillate, occasionally with two or three apices; caducous with short, medium, and long pedicels (3 to 138 µm); subglobose, ovoid, obovoid, ellipsoid, fusiform, pyriform, to distorted shapes sometimes with tapered bases (9–41 x 12–47 µm). Sporangiophores unbranched, irregularly branched, and occasionally simple sympodial. Hyphal swellings are occasionally produced by some isolates in aqueous cultures and are globose, subglobose, produced individually or catenulate. Chlamydospores absent.
Most typical characters
Phytophthora capsici is characterized by its production of caducous, short, medium, and long pedicel sporangia which are subglobose to ellipsoid, and the absence of chlamydospores. It differs from closely related Phytophthora tropicalis which produces caducous, long pedicel, elongated-narrow sporangia with a tapering base, and chlamydospores frequently produced.
Additional isolates with 100% alignment in ITS rDNA with ex-type CPHST BL 33
CPHST BL 136 (A1) duplicate of P1314 (World Phytophthora Collection) from green bell pepper (Capsicum annuum) in California, USA
P223 (A2) from former NCSU - Plant Pathogen Identification Laboratory, Director Gloria Abad, collected from "chile jalapeño" (Capsicum annum) in Guatemala
Hosts and distribution
Distribution: cosmopolitan; tropical specimens may be Phytophthora tropicalis
Substrate: roots, fruits, stems, seedlings, pods, cotton bolls
Disease note: fruit, stem, and root rot; also seedling damping-off, leaf wilt
Hosts: Phytophthora capsici sensu lato infects 51 genera in 28 families, including Capsicum annuum (peppers), Solanum lycopersicum (tomato), and other Solanaceae. Aragaki & Uchida (2001) refers to isolates from non-Capsicum hosts to P. tropicalis, including isolates from Macadamia spp., Theobroma cacao (cacao), and other tropical crop species.
Retrieved January 29, 2018 from U.S. National Fungus Collections Nomenclature Database.
Additional references and links
Bowers JH, Martin FN, Tooley PW, and Luz ED. 2007. Genetic and morphological diversity of temperate and tropical isolates of Phytophthora capsici. Phytopathology 97: 492-503.
- Phytophthora DATABASE: Phytophthora capsici
- EPPO-Q-bank: Phytophthora capsici
- SMML USDA-ARS: Phytophthora capsici
- EPPO Global Database: Phytophthora capsici
- Forest Phytophthoras of the world: Phytophthora capsici
- CABI Invasive Species Compendium: Phytophthora capsici
- Encyclopedia of Life (EOL): Phytophthora capsici
- Index Fungorum (IF): Phytophthora capsici
- Plantwise Knowledge Bank: Phytophthora capsici
- Google All Phytophthora capsici
- Google Images Phytophthora capsici
- Google Scholar Phytophthora capsici
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America