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  • Phytophthora acerina

    Phytophthora spp. in Clade 2c: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. acerina ex-type CPHST BL 114 = P19934 (WPC) (MG518642). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora acerina

    Phytophthora acerina (CPHST BL 114) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora acerina

    Phytophthora acerina (CPHST BL 114, ex-type) asexual phase and sexual phase (a-b); different shapes of semi-papillate persistent sporangia (a-e); photos by G. Abad, USDA-APHIS-PPQ

  • Phytophthora acerina

    Phytophthora acerina (ex-type CPHST BL 114) sexual phase formed on hemp seed agar (a-c): smooth-walled oogonia with paragynous antheridia and plerotic oospores; photos by G. Abad, USDA-APHIS-PPQ

  • Phytophthora agathidicida

    Phytophthora spp. in Clade 5: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. agathidicida ex-type CPHST BL 154 = P15175 (WPC) (MG602692). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora agathidicida

    Phytophthora agathidicida (CPHST BL 154) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora agathidicida

    Phytophthora agathidicida (ex-type CPHST BL 154) sexual phase formed on hemp seed agar: oogonia with wavy wall and tapered base, amphyginous antheridia, and plerotic, thick-walled oospores; photos by G.Abad, USDA-APHIS-PPQ

  • Phytophthora agathidicida

    Participants of the 5th IUFRO Phytophthora in Forests and Natural Ecosystems Working Group (March 7-12, 2010, Auckland and Rotorua, New Zealand) attending a presentation at the Waitakere Ranges Regional Park, west of Auckland. At this location iconic native kauri (Agathis australis) trees were affected by “kauri dieback” caused by “Phytophthora taxon agathis”; photo by Gloria Abad, USDA-APHIS-PPQ.

  • Phytophthora agathidicida

    Kauri giant tree with symptoms of bleeding canker. The New Zealand expert holds in the left hand a piece of the cortex that will be replaced, in respect of indigenous Māori traditions. Kauri holds a very significant place in their creation mythology, with the iconic trees having their own names, for example Tāne-mahuta “the God of the Forest”; photo by Gloria Abad, USDA-APHIS-PPQ.

  • Phytophthora agathidicida

    kauri (Agathis australis) giant tree with symptoms of bleeding canker; photo by Gloria Abad, USDA-APHIS-PPQ 

  • Phytophthora agathidicida

    Kauri dieback, caused by Phytophthora agathidicida, is specific to New Zealand kauri and can kill trees of all ages; photo courtesy of Kauri Dieback Programme Partners, New Zealand.

  • Phytophthora agathidicida

    Taking action to prevent the spread of kauri dieback, caused by Phytophthora agathidicida; photo courtesy of Kauri Dieback Programme Partners, New Zealand.

  • Phytophthora alni   subsp.  alni

    Phytophthora spp. in Clade 7a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. alni alni ex-type P16203 (WPC) (GU993881). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alni   subsp.  alni

    Phytophthora alni subsp. alni (SE 166 selected specimen): colony morphology on (a) PDA, and (b) V-8 agar;  (c, d) asexual phase sporangia, (e-l) sexual phase with homothallic gametangia showing amphigynous antheridia and typical oogonia with bullate protuberances (f, h-l), and tapered base (h); photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alni   subsp.  multiformis

    Phytophthora spp. in Clade 7a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. alni multiformis ex-type CPHST BL 2 = P16202 (WPC) (MG783372). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alni   subsp.  uniformis

    Phytophthora spp. in Clade 7a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. alni uniformis ex-type P16206 (WPC) (GU259293). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alni   subsp.  uniformis

    Phytophthora alni subsp. uniformis (CPHST BL 3) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora alni   subsp.  uniformis

    Phytophthora alni subsp. uniformis (Abad S511) sexual phase of a selected specimen: (a-g) oogonia smooth-walled, or with slightly wavy-edged-verrucose; antheridia amphigynous, single- or two-celled (most common as in f-g); oospore predominantly plerotic (except in g); photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alticola

    Phytophthora spp. in Clade 4: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. alticola neo-type TBF0060A10 (KX247599). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora alticola

    colony morphology after 7 days growth at 20ºC on CA, V8A, ½ PDA, and MEA (left to right)

  • Phytophthora alticola

    ovoid papillate and bipapillate sporangia, scale bar = 20 µm

  • Phytophthora alticola

    oogonia with wavy margins and aplerotic oospores with paragynous antheridia, scale bar = 20 µm

  • Phytophthora amaranthi

    Phytophthora spp. in Clade 2b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. amaranthi ex-type CPHST BL 174 = TARI28041 as Phytophthora sp. PJA-2014  (MG783373). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora amaranthi

    Phytophthora amaranthi (CPHST BL 174) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora amaranthi

    Phytophthora amaranthi (ex-type CPHST BL 174) asexual phase: (a-c) papillate and semipapillate sporangia; photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora amaranthi

    Phytophthora amaranthi (ex-type CPHST BL 174) homothallic sexual phase: (a-e) smooth-walled oogonia with amphigynous antheridia and aplerotic oospores; photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora amnicola

    Phytophthora spp. in Clade 6b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. amnicola ex-type DH228 (JQ029956). Z. Gloria Abad. USDA-APHIS-PPQ

  • Phytophthora amnicola

    Phytophthora amnicola colonies of the ex-types grown for 7 days at 20°C on: (a) V8® agar, (b) carrot agar, (c) potato-dextrose agar.

  • Phytophthora amnicola

    mature sporangia formed on V8 agar flooded with soil extract: (a) limoniform, (b) ovoid (c) internal nested proliferation (d) internal nested and extended proliferation (e) catenulate hyphal swellings; club-shaped knotty lateral hyphae; scale bar = 25 µm

  • Phytophthora andina

    Phytophthora spp. in Clade 1c: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. andina ex-type P13365 (WPC) (FJ801734). Z. Gloria Abad. USDA-APHIS-PPQ

  • Phytophthora aquimorbida

    Phytophthora spp. in Clade 9a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. aquimorbida ex-type CPHST BL 128 = P19964 (WPC) (MG783376). Z. Gloria Abad. USDA-APHIS-PPQ

  • Phytophthora aquimorbida

    Phytophthora aquimorbida (CPHST BL 128) colony of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar. Photo by Clinton Greub, Krysta Jennings, and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora aquimorbida

    Phytophthora aquimorbida (CPHST BL 128, ex-type) asexual phase (a-b) showing sporangium with direct germination (a) and hyphal swellings (b); sexual phase and hyphal swellings (c) and intercalary oogonium with thick-walled oospore (d); photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora arenaria

    Phytophthora spp. in Clade 4: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. arenaria ex-type CPHST BL 78 = P19599 (WPC) (MG783377). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora arenaria

    Phytophthora arenaria colonies of the ex-type grown for 7 days at 20°C on (a) V8® agar (b) carrot agar (c) malt extract agar (d) potato-dextrose agar.

  • Phytophthora arenaria

    papillate sporangia formed on V8 agar flooded with soil extract: (a) ovoid; (b) ovoid, sporangiophore laterally attached; (c) obpyriform, with pointed apex; (d) bipapillate, with large vacuole; (e) empty ovoid sporangium after release of zoospores; (f) catenulate, globose to subglobose hyphal swellings, some with radiating hyphae; scale bar = 25 µm

  • Phytophthora arenaria

    (a) semi-mature oogonia with aplerotic thick-walled oospores containing ooplasts and coarsely granulated cytoplasm; (b-c) mature oogonia with slightly wavy-edged, bronze-brown walls and thick-walled oospores containing ooplasts; scale bar = 25 µm

  • Phytophthora asiatica

    Phytophthora spp. in Clade 7b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. asiatica ex-type CPHST BL 124 = P19972 (WPC) (MG783378). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora asiatica

    Phytophthora asiatica (CPHST BL 124) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora asiatica

    Phytophthora asiatica (ex-type Toku1); slide provided by Mohamed Rahman and Koji Kageyama, Gifu University, Japan

  • Phytophthora asiatica

    Phytophthora asiatica (ex-type Toku1) asexual phase: (a-e) nonpapillate sporangia, (f-h) internal proliferation, (f,g) extended proliferation, (h) nested proliferation, (i) catenulate lobate hyphal swellings; photos by Mohamed Rahman and Koji Kageyama, Gifu University, Japan

  • Phytophthora asiatica

    Phytophthora asiatica (ex-type Toku1) sexual phase: (a-c) smooth-walled oogonia with amphigynous antheridia and aplerotic oospores, (b,c) antheridia with digitated projections, (d,e) oogonia with both amphigynous and paragynous antheridia, (f) oogonium with two oospores and amphigynous antheridium; photos by Mohamed Rahman and Koji Kageyama, Gifu University, Japan

  • Phytophthora asiatica

    leaf bight of kudzu (Pueraria lobata) caused by Phytophthora asiatica; photo by Mohamed Rahman and Koji Kageyama, Gifu University, Japan

  • Phytophthora asparagi (invalid)

    Phytophthora spp. in Clade 6: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. asparagi ex-type LT288 (EF185089). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora attenuata

    Phytophthora spp. in Clade 7a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. attenuata ex-type TW129 (KU517154). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Phytophthora spp. in Clade 8d: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. austrocedri ex-type CPHST BL 5 = P16040 (WPC) (MG783380). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Phytophthora austrocedri (CPHST BL 5) colony of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Phytophthora austrocedri (CPHST BL 5, ex-type) asexual phase (a-d): sporangia semipapillate (a-b), persistent (a), caducous (b); typical hyphal swellings (c, e); photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Phytophthora austrocedri (CPHST BL 5, ex-type) sexual phase (a-d): smooth-walled oogonia (a-c), sometimes with finger-like wall projections (d), amphigynous antheridia with one big cell (a-b & d), paragynous antheridium (c) also observed; photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Participants of the 7th IUFRO Phytophthora Working Group (November 10-14, 2014, Esquel, Patagonia, Argentina) attending presentations at Los Alerces National Park. Participants observed native forest sanitary problems, including the mortality of Austrocedrus chilensis affected with mal del cipres caused by Phytophthora austrocedri. Typical Argentinian asado in bottom right photo. photos by G. Abad

  • Phytophthora austrocedri

    Panoramic view of Los Alerces National Park where the mortality of Austrocedrus chilensis affected with mal del ciprés is observed. The disease was first detected in the area in 1935, and it was attributed to different causes. Many decades after, in 2005, the cause was attributed to Phytophthora. photo by Gloria Abad – USDA-APHIS-PPQ

  • Phytophthora austrocedri

    Symptoms of “mal del ciprés” caused by Phytophthora autrocedri and taking action to prevent the spread of the disease into healthy areas. Views in Los Alerces National Park, Patagonia Argentina during the 7th IUFRO Phytophthora; photos by Gloria Abad, USDA-APHIS-PPQ 

  • Phytophthora austrocedri

    Juniperus communis infected with Phytophthora austrocedri at Glenartney Perthshire Scotland (a, c), Whitewell Cairngorms National Park Scotland (b), Juniper Gill Yorkshire England (d), and Whitewell (e). Lesion extends up the trunk forming a cinnamon-colored tongue with the healthy, white phloem around it. Photos courtesy of April Amstrong and Sara Green at Centre for Forestry and Climate Change (CFCC), Forest Research, Northern Res. Station, Roslin, Scotland

  • Phytophthora balyanboodja

    Phytophthora spp. in Clade 6a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. balyanboodja ex-type VHSC25675 Phytophthora taxon cyperaceae (KJ372258). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora balyanboodja

    colony morphology after 5 d growth at 20ºC on CA, V8 agar, MEA, and PDA (from left to right)

  • Phytophthora balyanboodja

    sporangia typically ovoid and nonpapillate, although many had apical protrusions which continued to grow leading to direct germination of sporangia; scale bar = 25µm

  • Phytophthora balyanboodja

    proliferation in chains, both nested and extended; scale bar = 25µm

  • Phytophthora bilorbang

    Phytophthora spp. in Clade 6b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. bilorbang ex-type CBS161653 (JQ256377). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora bilorbang

    Phytophthora bilorbang colonies of the ex-type grown for 7 days at 20°C on: (a) V8® agar (b) carrot agar (c) malt extract agar (d) potato-dextrose agar

  • Phytophthora bilorbang

    non-papillate sporangia formed on V8 agar flooded with soil extract; (a) limoniform (b) ellipsoid, (c) ovoid, (d) obpyriform (e) peanut shaped (f) club shaped (g) nested internal proliferation (h) an external proliferation arising from the internally proliferating sporangiophore, (i) catenulate, globose to subglobose hyphal swellings; scale bar = 25 µm

  • Phytophthora bilorbang

    (a) oospores with large ooplast bodies; (b) a pleorotic oospore and paragynous and spherical antheridium with a short projection; (c) oospores with two ooplast bodies; (d) oospores with two nuclei; (e-f) paragynous antheridia with short finger-like projections; scale bar = 25 μm

  • Phytophthora bishii

    Phytophthora spp. in Clade 2d: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. bishii (P. bisheria) ex-type CPHST BL 6 = P10117 (WPC) (MG783381). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora bishii

    Phytophthora bishii (CPHST BL 6) colony of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora bishii

    Phytophthora bishii (CPHST BL 6) asexual phase of the ex-type: (a-i) semipapillate persistent sporangia with different shapes, originated in simple sympodial sporangiophore (a-c) and (d) by external proliferation; (j-m) hyphal swellings; photos by G. Abad, USDA-APHIS-PPQ 

  • Phytophthora bishii

    Phytophthora bishii (CPHST BL 6) sexual phase of the ex-type (a-h): photos by G. Abad, USDA-APHIS-PPQ

  • Phytophthora bishii

    pathogenicity test of Phytophthora bishii (Abad 1-33) selected specimen (center) as compared with an isolate of P. cactorum (Abad Ph338) (left) and healthy control (right); photo by Gloria Abad at the former Plant Pathogen Identification Laboratory (PPIL), Department of Plant Pathology, North Carolina State University, USA (2001-2006)

  • Phytophthora boehmeriae

    Phytophthora spp. in Clade 10b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. boehmeriae ex-type CPHST BL 32G = P6950 (WPC) (MG783382). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora boehmeriae

    Phytophthora boehmeriae (CPHST BL 79) colony of a selected specimen grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

  • Phytophthora boehmeriae

    Phytophthora boehmeriae (CPHST BL 32G ex-type) (a) colony morphology on potato dextrose agar, (b-g) asexual phase; (a-c) sporangia originated in unbranched or sympodially branching sporangiophores, (d-g) sporangia papillated caducous with short pedicels, (d-f) sporangia globose, (g) sporangium with irregular shape; photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora boehmeriae

    Phytophthora boehmeriae (CPHST BL 32G ex-type) sexual phase: (a-d) oogonia smooth-walled with amphigynous antheridia almost spherical in shape and plerotic oospores, (b, c) antheridia with digitated projections; photos by Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora boehmeriae

    Neighbor-joining phylogenetic tree with 1000 bp based on the ITS rDNA region of Phytophthora species in Clade 10 showing the position of Phytophthora boehmeriae ex-type (in red) and the cluster of the "sensu stricto". Other clusters correspond to P. gondwanenwsis (2017) and putative new species in P. like boehmeriae "complex". Phythophthora parvispora in Clade 9 is the outgroup.

  • Phytophthora boehmeriae

    Phytophthora species in Clade 10 (ITS rDNA). Notice the position of the cluster of the "sensu stricto" of P. boehmeriae, in relation of the position of P. gondwanensis and other related clusters. Blue arrows point the position of sequences from the the ex-type and red arrows show the position of misidentifications.

  • Phytophthora boodjera

    Phytophthora spp. in Clade 4: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. boodjera ex-type VH26806 (KJ372244). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora boodjera

    Phytophthora boodjera colony of the ex-type grown for 7 days at 20°C on: a) carrot agar, b) V8® agar, c) malt extract agar, d) half-strength potato-dextrose agar

  • Phytophthora boodjera

    ovoid to broadly ovoid papillate sporangia of Phytophthora boodjera formed on V8A flooded with soil extract

  • Phytophthora boodjera

    aplerotic oospores of P. boodjera with paragynous antheridia; scale bar = 20 μm

  • Phytophthora borealis

    Phytophthora spp. in Clade 6b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. borealis ex-type A2 MYA-4881 (HM004232). Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora botryosa

    Phytophthora spp. in Clade 2a: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. botryosa ex-type A2 IMI136915 (AF266784). Species of concern for the USA as of 2009 are marked in bold. Z. Gloria Abad, USDA-APHIS-PPQ

  • Phytophthora botryosa

    Phytophthora botryosa (Abad Ph450) selected specimen: (a) colony on V-8 agar, (b-h) semipapillated sporangia, (b) produced in botryose clumps, (c) sporangia produced in botryose simple sympodial sporangiophore; (e-h) sporangia with medium-length pedicel; (d) chlamydospores (arrows); (i, j) oogonia with amphigynous antheridia produced after pairings with opposite type; photos by G. Abad, USDA-APHIS-PPQ

  • Phytophthora brassicae

    Phytophthora spp. in Clade 8b: portion of the ITS rDNA neighbor-joining phylogenetic tree (1000 bs) of 161 species [139 ex-types (ET) and 22 well-authenticated specimens (SE)]. Notice the position of P. brassicae ex-type CPHST BL 8 = P7517 (WPC) (MG783384). Z. Gloria Abad, USDA-APHIS-PPQ