Status of the Pythiaceae (Straminipila) in Argentina I. the genus Pythium

Abstract

The genus Pythium (Pythiaceae (Peronosporomycetes-ex Oomycetes), KingdomStraminipila) includes important pathogens, affecting a wide range of hosts of economic value, causing damping-off and decline of herbaceous and wooded plants due to rootlets rot. In order to acquire a more comprehensive vision of Pythium in Argentina, a review and an updated report of recent progress in this matter was carried out since the first reports in the late XIX century till October 2009. Information was taken from printed and on line primary and secondary sources such as Proceedings of national and international Scientific Meetings, Bulletins from National Institutions and Universities, periodical Journals, books and data bases. The information was analyzed and categorized, thus updating the number of species of this genus, their geographical distribution, hosts affected, and symptoms. So far 18 species have been cited affecting, 247 hosts. The greatest number of hosts is affected by P. ultimum and P. debaryanum, followed by P. irregulare and P. aphanidermatum. The diversity of Pythium species in the world suggests that perhaps a wider variety of species, still not cited, could be present in Argentina. Projects dedicated to surveying the presence and identification of Pythium spp are necessary.

Full text

197
H. E. Palmucci et al. - The genus Pythium in Argentina Bol. Soc. Argent. Bot. 46 (3-4) 2011 ISSN 0373-580 X
Bol. Soc. Argent. Bot. 46 (3-4): 197-211. 2011
StatuS of the Pythiaceae (StraminiPila) in argentina
i. the genuS
Pythium
HEMILSE E. PALMUCCI1, SILVIA M. WOLCAN2 and PABLO E. GRIJALBA1
Summary: The genus Pythium (Pythiaceae (Peronosporomycetes - ex Oomycetes), Kingdom
Straminipila) includes important pathogens, affecting a wide range of hosts of economic value, causing
damping-off and decline of herbaceous and wooded plants due to rootlets rot. In order to acquire a more
comprehensive vision of Pythium in Argentina, a review and an updated report of recent progress in this
matter was carried out since the rst reports in the late XIX century till October 2009. Information was
taken from printed and on line primary and secondary sources such as Proceedings of national and
international Scientic Meetings, Bulletins from National Institutions and Universities, periodical Journals,
books and data bases. The information was analyzed and categorized, thus updating the number of
species of this genus, their geographical distribution, hosts affected, and symptoms. So far 18 species
have been cited affecting, 247 hosts. The greatest number of hosts is affected by P. ultimum and P.
debaryanum, followed by P. irregulare and P. aphanidermatum. The diversity of Pythium species in the
world suggests that perhaps a wider variety of species, still not cited, could be present in Argentina.
Projects dedicated to surveying the presence and identication of Pythium spp are necessary.
Key words: Pythiaceae, Pythium, Straminipila Kingdom, Oomycetes = Peronosporomycetes, Hosts,
Argentina.
Resumen: Status de la familia Pythiaceae (Reino Straminipila) en Argentina. I. El género Pythium. El
género Pythium (Pythiaceae (Peronosporomycetes-ex Oomycetes), Straminipila) incluye patógenos que
afectan hospedantes de importancia económica, ocasionando damping off en pre y postemergencia
de plántulas de almácigo y el declinamiento de plantas herbáceas y adultas por destrucción de las
raíces absorbentes. Con la nalidad de conocer el estado actual de la información disponible sobre
este género en Argentina, se llevó a cabo una revisión desde los primeros reportes a nes del siglo
XIX hasta octubre de 2009. Se consultaron fuentes primarias y secundarias de información escrita
y electrónica: presentaciones en congresos nacionales e internacionales, publicaciones periódicas
nacionales e internacionales, boletines de instituciones y universidades, libros y bases de datos. La
información obtenida fue categorizada y analizada permitiendo conocer el número de especies de este
género, su distribución geográca y por tipo de cultivos, relaciones hospedante-patógeno involucradas
y la sintomatología observada. Se encuentran citadas 18 especies que afectan a 247 hospedantes.
Un elevado número de hospedantes fueron afectados por P. ultimum y P. debaryanum, seguidos por
P. irregulare y P. aphanidermatum. La diversidad de especies de Pythium en el mundo sugiere que un
mayor número de especies podrían estar presentes en el país, siendo necesario su relevamiento e
identicación.
Palabras clave: Pythiaceae, Pythium, Reino Straminipila, Oomycetes = Peronosporomycetes,
hospedantes, Argentina.
1 Cátedra de Fitopatología. Facultad de Agronomía. Universidad de Buenos Aires. Av. San Martin 4453. CP 1417.
Buenos Aires, Argentina. E-mail: palmucci@agro.uba.ar
2 CIC - CIDEFI, Facultad de Ciencias Agrarias y Forestales, UNLP, 60 y 119, 1900 – La Plata, Buenos Aires,
Argentina.

H. E. Palmucci et al. - The genus Pythium in Argentina
198
Bol. Soc. Argent. Bot. 46 (3-4) 2011
introduction
The genus Pythium (Peronosporomycetes-ex
Oomycetes) was previously considered a real
fungus. Later, it was reclassied and relocated in
the Straminipila Kingdom (Gunderson et al., 1987;
Patterson, 1989; Förster et al., 1990, Dick, 2001),
mainly due to the characteristics of the cellular wall
composition – cellulose and beta glucans instead of
chitin (Bartnicki-Garcia, 1969) - and the presence
of heterokontes spores with two agella (Van der
Plaats-Niterinck, 1981) which allow the zoospores
to swim in liquid media. So far, 160 species of
Pythium have been described (Abad et al., 2006;
Abad, 2008).
Members of the genus Pythium are soil-
inhabiting organisms that occur all over the world.
They are, however, most commonly encountered in
cultivated soils causing serious problems for various
agronomically important crops. Some species are
ubiquitous and occupy various ecological niches,
being, most of them, saprothophic and are present
in different soil types and aquatic environments
(Van der Plaats-Niterinck, 1981). Some others are
important plant pathogens, with various degrees
of pathogenicity, which can affect many different
plants, or be host specic (Frezzi, 1956; Van der
Plaats-Niterinck, 1981).
Plant pathogenic Pythium species can cause
destructive diseases to thousands of plant species.
They affect mainly seedbeds of different crops
causing seed rot, seedling damping-off, and,
occasionally, they cause root rot of different types
of adult plants. Young or watery plant tissue
is preferentially attacked. Soft, fleshy organs
of vegetables in contact with the soil, such as
cucurbit fruits, green beans, and potatoes, are
sometimes infected by damping-off Oomycetes
during extended wet periods (Frezzi, 1956; Van der
Plaats-Niterinck, 1981).
The development of Pythium is favored by
decient soil drainage, high proportion of clay and
poor air circulation among plants. The conditions of
high humidity and free water facilitate the spread
of zoospores. This characteristic of the fungus
makes it responsible for important phytosanitary
problems mainly in the intensive crops that utilize
organic substrates or hydroponic systems (George
& Biernbaum, 1990; Stanghellini & Rasmussen,
1994; Schnitzler, 2004; Hong & Moorman, 2005).
The introduction of the inoculum in the crop may
be due to infected soil, substrates, tools, irrigation
water or seeds. Oospores are resistant to adverse
temperatures and moisture and serve as the survival
and resting stage of the fungus (Shokes & Carter,
1979; Pickett-Popoff & Panter, 1994; Martin &
Loper, 1999; Sutton et al., 2006).
In the last decade, developments in molecular
(nucleic acid-based) diagnostic methods have made
signicant improvements in the detection of plant
pathogens (Munford et al., 2006) and phylogenetic
studies have allowed a greater knowledge of the
species and their populations (Briard et al., 1995;
Matsumoto et al., 1999; Martin, 2000; Van de Peer
et al., 2000). Various authors (Guindon & Gascuel,
2003; Lévesque & De Cock, 2004; Paul et al.,
2008) have introduced modications in the way the
species are grouped, dening different clusters.
The aim of our work was to carry out a revision
of the ndings of the genus Pythium affecting
cultivated plants registered so far in Argentina.
material and method
The information was taken from: a) printed and
electronical primary sources such as Proceedings
of National and International Scientic Meetings,
Bulletins from National Institutions and Universities
and periodical Journals, and b) printed and
electronical secondary sources such as ‘Atlas e Índice
de Enfermedades de Plantas Cultivadas y Nativas
Explotadas de Argentina’ (Nome et al., 2009) and data
bases, such as CAB and Biological Abstracts.
In this review only the records of Pythium spp.
affecting plants were taken into account. Species
from water, soil, animals and man were discarded
for the present review.
Information was analyzed and categorized. An
inventory was brought up to date about number of
species of Pythium, geographical distribution in the
country and natural and cropped affected hosts.
reSultS
According to the result of this review, the rst
species reported in Argentina was Pythium ultimum

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H. E. Palmucci et al. - The genus Pythium in Argentina Bol. Soc. Argent. Bot. 46 (3-4) 2011
in 1937 infecting Beta vulgaris and Brassica
oleraceae (Frezzi, 1947). The most important
research was carried out by Frezzi, who studied,
between the years 1937 and 1956, the only 17
species known in the country till the nding of
P. tracheiphillum by Kiehr et al., 2000. Frezzi
(1956) mentions a group which he calls Pythium
cf. ultimum (latin: conferre = close to), in which he
places those unconrmed strains like P. ultimum
without sexual structures. P.cf. ultimum was found
causing damping off on Nicotiana tabacum (Buenos
Aires province), on Pinus sp (Mendoza and Santa
Cruz), on Cedrus sp. (Mendoza), on Prosopis alba
(Córdoba) and Picea excelsa (Tierra del Fuego).
To date 18 identied species have been reported
in Argentina on 248 host-pathogen relations (Table
1).
Pythium ultimum and P. debaryanum are the
species that affect the greatest number of hosts,
followed by P. irregulare and P aphanidermatum.
Other species affect 1 to 9 hosts (Table 1 and Fig.
1).
Table 1: Pythium spp. cited in Argentina: host pathogen relations, symptoms and localities where they
were recorded. Records of unidentied Pythium species are presented under Pythium spp.
Species Hosts Symptoms Proviences1 References
P. acanthicum
Drechsler
Arachis hypogaea Fruit rot and root Cba Tello et al., 2002
Citrullus lanatus Fruit and root rot Cba Frezzi, 1956
P.
aphanidermatum
(Edson) Fitzp
Allium cepa Asymptomatic or root rot BA Kiehr et al., 2002
Amaranthus caudatus Root, collar and fruit rot Ctes Noelting & Sandoval,
2003
Allium schoenoprasum Root and basal rot Ctes Colombo et al, 2005
Beta vulgaris Damping off Cba Frezzi, 1956
Capsicum annuum Root rot and necrosis
stem / Damping off
Cba, Sal, Ctes Frezzi, 1956, Colombo
et al, 2005
Cereus aethiops Root rot and necrosis
stem
Cba Frezzi, 1956
Citrullus lanatus Fruit rot Brown Cba Frezzi, 1956
Cucumis melo Fruit rot Cba Frezzi, 1956
Cucurbita maxima Fruit rot, basal rot Cba,
Ctes
Frezzi, 1956, Colombo et
al, 2005
Cucurbita pepo Root rot Cba Frezzi, 1956
Euphorbia marginata Root rot Cba Frezzi, 1956
Euphorbia pulcherrima Root and stem rot BA Palmucci & Grijalba,
2007
Fragaria vesca Root rot Cba Frezzi, 1956
Medicago sativa Damping off BA Frezzi, 1977,
Ostazeski & Hijano, 1986
Melia azedarach Root rot, Damping off Cba Frezzi, 1956
Morus alba Damping off Cba Frezzi, 1956
Ocimum basilicum Basal rot Ctes Colombo et al, 2005
Phaseolus vulgaris Root rot and necrosis
stem , fruit rot
Cba Frezzi, 1956
Pisum sativum Root rot Cba Frezzi, 1956
Solanum melongena Basal rot Ctes Colombo et al, 2005
P. catenulatum
V.D. Matthews
Capsicum annuum Damping off, root rot Cba Frezzi, 1956
Cyamopsis tetragonoloba Damping off, root rot Cba Frezzi, 1956
Solanum lycopersicum Damping off LP Frezzi, 1956
Solanun melongena Damping off LP Frezzi, 1956
P. debaryanum Alternanthera sp Root rot Tuc Frezzi, 1956

H. E. Palmucci et al. - The genus Pythium in Argentina
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Bol. Soc. Argent. Bot. 46 (3-4) 2011
Species Hosts Symptoms Proviences1 References
R. Hesse Antirrhinum majus Root rot Cba Frezzi, 1956
Arachis hypogaea Fruit and seed rot, root rot Cba Frezzi, 1956,1960
Arachis pusilla Root rot Cba Frezzi, 1956
Ageratum sp Root rot Cba Frezzi, 1956
Brachichiton acerifolius Damping off Cba Frezzi, 1956
Brassica napus Root rot Cba Frezzi, 1956
Caesalpìnia gilliesii Damping off Cba Frezzi, 1956
Capsicum annum Damping off ER Frezzi, 1956
Calendula ofcinalis Damping off Tuc Frezzi, 1956
Carica papaya Damping off Cba Frezzi, 1956
Celosia cristata Damping off Cba Frezzi, 1956
Cercis siliquastrum Damping off Cba Frezzi, 1956
Cicer arietinum Root rot Chu Frezzi, 1956
Citrullus lanatus Brown Fruit rot, damping
off cottony leak
Cba Frezzi, 1956
Clarkia sp Damping off Tu c Frezzi, 1956
Cucumis melo Damping off, fruit rot Cba Frezzi, 1956
Cucumis sativus Damping off Cba Frezzi, 1956
Cucurbita máxima Stem and fruit rot Cba Frezzi, 1956
Erythrina crista galli Root and stem rot in
potted plant
Cba Frezzi, 1956
Eucalyptus sideroxylon Damping off Cba Frezzi, 1956
Gaillardia pulchella Root rot Cba Frezzi, 1956
Gysophila paniculata Damping off Cba Frezzi, 1956
Helianthus annuus Root and base stem rot Cba Frezzi, 1956
Hordeum vulgare Root rot ,Damping off Fsa Frezzi, 1956
Ipomea batatas Root and fruit rot Cba, Ctes, BA Frezzi, 1956, Colombo et
al. 1993
Lathyrus cicera Root rot Cba Frezzi, 1956
Lathyrus odoratus Root rot Cba Frezzi, 1956
Lathyrus pubescens Root rot Cba Frezzi, 1956
Lathyrus tingitanus Root rot Cba Frezzi, 1956
Ligustrum lucidum Damping off Cba Frezzi, 1956
Limonium sp Root and stem rot Cba Frezzi, 1956
Luffa cylindrica Damping off Cba Frezzi, 1956
Solanum lycopersicum Damping off Cba, LP, Tuc,
Mis, Juj
Frezzi, 1956
Matthiola sp Damping off Tuc Frezzi, 1956
Medicago sativa Damping off Cba Frezzi, 1956, Ostazeski &
Hijano, 1986
Melilotus indicus Root rot Cba Frezzi, 1956
Morus alba Damping off Cba Frezzi, 1956
Nicotiana tabacum Damping off Tuc Delle Coste, 1945
Parthenium argentatum Damping off Cba Frezzi, 1956
Phaseolus vulgaris Fruit rot, stem and root rot Cba, Chu Frezzi, 1956
Pinus excelsa Damping off RN Frezzi, 1956
Pinus halepensis Damping off Cba, ER, LR Frezzi, 1956
Pinus pinea Damping off SL Frezzi, 1956
Pinus radiata Damping off RN Frezzi, 1956
Pyrus sylvestris Damping off RN Frezzi, 1956
Pisum sativum Root rot, damping off,
seed rot
Cba Frezzi, 1956
Prosopis alba Damping off Cba Frezzi, 1956
Salvia splendens Damping off Cba Frezzi, 1956
Schinus molle Damping off Cba Frezzi, 1956
Solanun melongena Damping off LP Frezzi, 1956

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Species Hosts Symptoms Proviences1 References
Solanum tuberosum Brown fruit rot Cba, SF Frezzi, 1956
Thuya sp Damping off Cba Frezzi, 1956
Thuya occidentalis Damping off Cba Frezzi, 1956
Zinnia sp Damping off Cba Frezzi, 1956
P. dissotocum
Drechsler
Gladiolus communis Root necrosis Sal Frezzi, 1956
Solanum lycopersicum Damping off Juj Frezzi, 1956
Morus alba Damping of Cba Frezzi, 1956
P. graminicola
Subraman.
Maranta arundinacea Root rot in potted plant Cba Frezzi, 1956
Saccharum ofcinnarum Root rot Tuc Vazquez de
Ramallo,1985
P. intermedium Capsicum annuum Damping off Cba Frezzi, 1956
de Bary Solanum lycopersicum Damping off Tuc Frezzi, 1956
Morus alba Damping off Cba Frezzi, 1956
Piptadenia rigida Damping off Mis Frezzi, 1956
Pythium irregulare
Buisman
Alternanthera sp Root rot Tuc Frezzi, 1956
Arachis hypogaea Fruit and seed rot Cba Frezzi, 1956, 1960, Tello
et al., 2002
Avena sativa Root rot, seedling blight Cba Frezzi, 1956
Camellia thea Root and fruit rot Mis Frezzi, 1977
Cupressus lusitanica Damping off Tuc Frezzi, 1956
Cynara scolymus Root rot Cba, BA Frezzi, 1956, Carranza,
1979
Daucus carota Damping off brown rot
and forking
Cba Frezzi, 1956
Dianthus caryophillus Damping off Tuc Frezzi, 1956
Eruca sativa Damping off Cba Frezzi, 1956
Erythrina crista-galli Root necrosis Cba Frezzi, 1956
Eucalyptus occidentales Damping off Cba Frezzi, 1956
Foeniculum vulgare Damping off Cba Frezzi, 1956
Gaillardia aristata Damping off Tuc Frezzi, 1956
Gypsophila sp Damping off Tuc Frezzi, 1956
Hordeum vulgare Root and fruit rot Cba Frezzi, 1956
Lactuca sativa Damping off Cba Frezzi, 1956
Lupinus sp. Damping off Cba Frezzi, 1956
Solanum lycopersicum Damping off Tuc Frezzi, 1956
Medicago sativa Damping off Cba Frezzi, 1956
Nicotiana tabacum Damping off Cba Frezzi, 1956
Petroselinum crispum Damping off Cba Frezzi, 1956
Phaseolus vulgare Root rot Cba Frezzi, 1956
Phoenix dactylifera Damping off SL Frezzi, 1956
Pinus halepensis Damping off Cba Frezzi, 1956
Pisum sativum Root rot Cba Frezzi, 1956
Solanum melongena Damping off Tuc Frezzi, 1956
Sorghum vulgare Root rot Cba Frezzi, 1977
Thuja sp. Damping off Cba Frezzi, 1956
Thuja occidentales var.
compacta
Damping off Cba Frezzi, 1956
Tragopogon porrifolius Root rot Cba Frezzi,1956
Trifolium repens Damping off Cba Frezzi,1956
Zinnia sp Damping off Cba Frezzi, 1956
P. mastophorum
Drechsler
Brassica oleracea var.
capitata
Damping off Cba Frezzi, 1956
Petroselinum crispum var
vulgare Damping off Cba Frezzi, 1956

H. E. Palmucci et al. - The genus Pythium in Argentina
202
Bol. Soc. Argent. Bot. 46 (3-4) 2011
Species Hosts Symptoms Proviences1 References
P. oligandrum Antirrhinum majus Root rot Cba Frezzi, 1956
Drechsler Carthamus tinctorius Root rot Cba Frezzi, 1956
Citrullus lanatus Brown fruit rot (cottony
leak)
Cba Frezzi, 1956
Malus domestica Root rot Mza Frezzi, 1956
Malus sylvestris Root Mza Feldman & Pontis, 1960
Matthiola sp Root rot Cba Frezzi, 1956
Phaseolus acutifolium var.
latifolum
Root rot, necrosis in stem Cba Frezzi, 1956
Pisum sativum Root rot Cba Frezzi, 1956
Santolina
chamaecyparissus
Root rot Cba Frezzi, 1956
P. periplocum Citrullus lanatus Brown Fruit rot, Cba Frezzi, 1956
Drechsler Phoenix dactylifera Damping off, root rot and
stem necrosis
SL Frezzi, 1956
P. polymorphon Cupressus horizontales Root rot in potted plant Cba Frezzi, 1956
Sideris Solanum lycopersicum Damping off Tuc Frezzi, 1956
Trifolium pratense Damping off Cba Frezzi, 1956
P. rostratum
E. Buttler
Solanum lycopersicum Damping off Cba Frezzi, 1956
Pinus halepensis Damping off Cba Frezzi, 1956
Trifolium repens Damping off Cba Frezzi, 1956
P. spinosum Arachis hypogea Fruit rot Cba Frezzi, 1960
Sawada Gypsophila sp Damping off Tuc Frezzi, 1956
Solanum melongena Damping off Tuc Frezzi, 1956
P. torulosum Piptadenia rigida Damping off Mis Frezzi, 1956
Coker & P. Patt
P. tracheiphilum Lactuca sativa Root rot BA Kiehr et al., 2000
Matta
P. ultimum Trow Acacia decurrens var.
dealbata
Damping off ER Frezzi, 1956
Albizzia julibrissin Damping off Cba Frezzi, 1956
Allium cepa Damping off BA Kiehr et al., 1996
Antigonium sp Root rot Tuc Frezzi, 1956
Antirrhinum majus Root rot Cba Frezzi, 1956
Apium graveolens var.
dulce
Damping off Cba Frezzi, 1956
Arachis hypogaea Fruit, seed and root rot Cba Frezzi, 1956; 1960, Tello
et al., 2002
Begonia sp. Root rot Cba Frezzi, 1956.
Begonia imperiales var.
maculata
Root rot Cba Frezzi, 1956
Beta vulgaris Damping off Ctes Frezzi, 1956; Mazanti,
1972
Beta vulgaris var. cicla Damping off, root rot Cba Frezzi, 1947, 1956
Brachychiton populneum Damping off Cba Frezzi, 1947, 1956
Brassica oleracea var.
botrytis
Damping off Cba, Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Caesalpinia gilliesii Damping off Cba Frezzi, 1956
Cannabis sativa Root rot BA, Cba Di Fonzo, 1945 2; Frezzi,
1956
Carica papaya Root rot, seedling Ctes Frezzi, 1956; Mazanti,
1972
Capsicum annuum Damping off Sal, RN Frezzi, 1956; Bergna,
1963
Cattleya spp Black rot BA Jauch, 1952 2
Celosia plumosa Damping off Cba Frezzi, 1956

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Species Hosts Symptoms Proviences1 References
Ceratonia siliqua Damping off Cba Frezzi, 1956
Chorisia speciosa Damping off Ctes Frezzi, 1956; Mazanti,
1972
Chorisia insignis Damping off Cba, Tuc Frezzi, 1956
Chorisia sp. Damping off Cba Frezzi, 19472
Cicer arietinum Root rot Cba Frezzi, 1956
Citrullus lanatus Fruit rot, cottony leak Cba Frezzi, 1956
Clarkia sp. Damping off Tuc Frezzi, 1956
Coffea arabica Root rot Tuc Frezzi, 1956
Coleus sp. Root rot Cba Frezzi, 1956
Cucumis sativus Fruit rot Cba Frezzi, 1956
Cucurbita máxima Root rot Cba Frezzi, 1956
Cupressus horizontales Damping off ER Frezzi, 1956
Cyamopsis tetragonoloba Damping off Cba Frezzi, 1956
Delphinium sp. Damping off Tuc Frezzi, 1956
Dianthus caryophillus BA Carrera, 1955 2
Emerus marginatus Damping off Cba Frezzi, 1956
Eucalyptus globulus Damping off BA, Cba, Ctes Frezzi,1947, 1956;
Sarasola & Rocca
de Sarasola,. 1959;
Mazanti, 1972; Merlo,
1981
Eucalyptus leucoxylon Damping off Cba Frezzi, 1956
Eucalyptus robusta Damping off Cba Frezzi, 1956; Sarasola &
Rocca de Sarasola, 1959
Eucalyptus viminalis Damping off BA,
Cba,Ctes
Frezzi,1947, 1956;
Sarasola & Rocca de
Sarasola, 1959; Merlo,
1981
Euphorbia marginata Root rot , damping off Cba Frezzi, 1956
Euphorbia splendens Stem and root rot Cba Frezzi, 1956
Fraxinus americana Damping off Cba Frezzi, 1956
Gomphrena sp Root rot Cba Frezzi, 1956
Gossypium sp. Damping off Cba Frezzi, 1956
Gossypium herbaceum Damping off Cha Bonacic Kresic & Ojeda,
1998.
Gysophila sp Damping off Cba Frezzi, 1956
Hibiscus esculentus Stem and root rot,
seedling
Ctes Frezzi, 1956; Mazanti,
1972
Hordeum vulgare Damping off Fsa Frezzi, 1956
Ipomoea batatas Brown fuit rot, root rot,
postharvest rot
BA, Cba Frezzi, 1956, Mitidieri,
1990
Jacaranda acutifolia Damping off Cba,
Ctes
Frezzi, 1947, 1956
Jacaranda mimosifolia Seedling Ctes Mazanti, 1972
Lathyrus cicera Root rot Cba Frezzi, 1956
Lathyrus pubescens Root rot Cba Frezzi, 1956
Lepidium sativum Root rot Cba Frezzi, 1956
Lilium candidum Collar sof rot, rot necrosis Tuc Frezzi, 1956
Linum usitatissimum Damping off Cba Frezzi, 1956
Lollium multiorum Root rot BA Frezzi, 1977
Lotus corniculatus Damping off BA Frezzi, 1956
Luffa cilindrica Damping off Cba Frezzi, 1956
Matthiola sp. Root rot , Cba, Tuc Frezzi, 1956
Medicago sativa Damping off Cba, BA Frezzi, 1956, Ostazeski &
Hijano, 1986
Melia azedarach Damping off, root rot Cba Frezzi, 1956

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Bol. Soc. Argent. Bot. 46 (3-4) 2011
Species Hosts Symptoms Proviences1 References
Melilotus albus Damping off Cba Frezzi, 1956
Peltophorum dubium Damping off Cba, Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Peperonia spp Root rot Tuc Frezzi, 1956
Petroselinum crispum Damping off Cba Frezzi, 1956
Phaseolus vulgaris Necrosis de vainas y
granos, root rot
Cba Frezzi, 1956
Picea excelsa Damping off RN Frezzi, 1956
Pinus canariensis Damping off Cba, Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Pinus contorta var. latifolia Damping off RN Frezzi, 1956
Pinus halepensis Damping off, root rot Ctes, Cba,
LR,ER
Frezzi, 1947, 1956;
Mazanti, 1972
Pinus halmintonii Damping off Cba Frezzi, 1956
Pinus longifolia Damping off Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Pinus pinaster Damping off Cba,Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Pinus pinea Damping off BA, Cba Frezzi, 1947, 1956
Pinus radiata Damping off Cba, RN Frezzi, 1947, 1956
Pinus sylvestris Damping off Ctes, RN Frezzi, 1956; Mazanti,
1972
Pinus spp Damping off Mza Schiel &Vitoria, 1946
Pisum sativum Root rot BA, Cba Frezzi, 1956
Prunus persica Damping off Cba Frezzi, 1956
Raphanus sativus Damping off Cba, Ctes Frezzi, 1947, 1956;
Mazanti, 1972
Salvia splendens Damping off Cba Frezzi, 1956
Senna corymbosa Damping off Cba Frezzi, 1956
Sesbania marginata Damping off Cba Frezzi, 1956
Solanum lycopersicum Damping off Cba, Ctes, Tuc,
Mis, Juj
Frezzi, 1947, 1956,
Mazanti, 1972
Solanum melongena Damping off Cba, Tuc Frezzi, 1947, 1956
Sorghum vulgare Root rot Cba, SF Frezzi, 1977
Spinacea oleracea Damping off Cba, Ctes Frezzi, 1947, 1956;
Mazanti., 1972
Thuja sp Damping off Cba Frezzi, 1956
Thuja occidentalis var.
aureovariegata
Damping off Cba Frezzi, 1956
Thuja occidentalis var.
compacta
Damping off Cba Frezzi, 1956
Triticum vulgare Root rot Cba Frezzi, 1977
Viola tricolor Damping off Tuc Frezzi, 1956
P. vexans Begonia sp Root rot Cba Frezzi, 1956
de Bary Begonia rex Root rot Cba Frezzi, 1956
Celosia cristata Damping off Cba Frezzi, 1956
Celosis plumosa Damping off Cba Frezzi, 1956
Citrullus lanatus Brown fruit rot Cba Frezzi, 1956
Dianthus chinensis Root rot Cba Frezzi, 1956
Eucalyptus teritiformis Damping off Cba, Ctes Frezzi, 1956; Merlo,
1981
Piptadenia rigida Damping off Mis Frezzi, 1956
Pythium spp Allium cepa Damping off Mza Gatica & Oriolani, 1997
Apium graveolens BA Varaschin & De Souza,
2003

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H. E. Palmucci et al. - The genus Pythium in Argentina Bol. Soc. Argent. Bot. 46 (3-4) 2011
Species Hosts Symptoms Proviences1 References
Begonia sp. BA Cipolla, 1948
Beta vulgaris subsp.
vulgaris
Damping off, black root,
seedling blight
BA Jauch, 1951
Brassica napus Damping off BA Monterroso & Delhey,
1995
Citrus spp y rutaceas Damping off pre and post
emergence
Ctes Canteros, 2009
Cucumis melo Root rot Mza, SJ Oriolani & Gatica, 1980
Cucurbita máxima Damping off SF Bonacic Kresic &
Campagnac, 1982
Eucalyptus sp Tu Carrera,1955 2
Eustoma grandiorum Root and basal rot Ctes Obregón et al., 2000
Fragaria x ananassa Plant death For, Ctes,SF Scaglia et al., 1984;
Bonasic Kresic &
Campagnac, 1982
Fucsia magellanica Root and stem rot BA Palmucci & Grijalba,
2003
Glycine max Damping off ER, SF, BA, LP Belmonte & Carrasco,
2006; Botta et al, 1997
Gossipium herbaceum Damping off Cha,Ctes,SF Campagnac, 1985
Ilex paraguariensis Damping off, Root rot Mis Marchionatto, 1948;
Rivera Flores, 1983
Impatiens wallerana Root rot BA Wolcan & Grego, 2007
Impatiens x hawkerii Crown and root rot BA Wolcan & Grego, 2007
Lactuca sativa Damping off Juj Alcoba et al., 2005
Lavandula dentata, Root rot BA Wolcan & Grego, 2004
Lavandula x intermedia Root rot BA Wolcan & Grego, 2004
Nicotiana tabacum Damping off Rot during
curate and conservation
Sal, Juj, Mis,
Cha, BA
Castelló et al, 1995;
Catania, 1992, Carrera,
1972 2; Alcoba et al,
2005; Dummel, 2008
Ocimum basilicum Damping off Collar and
root rot
Ctes Colombo & Obregón,
2006
Olea europea Wilt BA, Mza Goldenberg &
Castronovo, 1960;
Lucero et al., 2005
Pinus spp. Chu Barroetaveña &
Rajchenberg, 2005
Pisum sativum Neu Bergna, 1963
Solanum lycopersicum Damping off, Collar and
root rot
Ctes, Sal; Juj Flores et al., 2008,
Colombo, 2009
Triticum spp Damping off LP, BA, SF Pérez Fernández &
Corro Molas, 2001
Vaccinium corymbosum Root BA Wright et al., 2005
Zea mays Damping-off, stalk rot Cba Botta, 2001
1 BA: Buenos Aires; Cat.: Catamarca; Cba: Córdoba; Ctes: Corrientes; Cha: Chaco; Chu: Chubut; ER: Entre
Rios; Fsa: Formosa, Juj: Jujuy; LP: La Pampa; LR: La Rioja; Mza: Mendoza; Mis.: Misiones; Neu: Neuquén;
RN: Rio Negro; Sal: Salta; SF: Santa Fe; SJ: San Juan; SL: San Luis; TF: Tierra del Fuego e islas Malvinas;
Tuc.: Tucumán

H. E. Palmucci et al. - The genus Pythium in Argentina
206
Bol. Soc. Argent. Bot. 46 (3-4) 2011
Córdoba province has the highest number of
species and in Chaco and Catamarca no species
were isolated (Table 2). Pythium ultimum occurs
in most of the provinces and P. mastophorum, P.
rostratum, P. torulosum and P. tracheiphilum only
in one of them (Table 2). The high number of
records in Cordoba province is due to the fact that
the researcher Mariano Frezzi carried out most of
his work in this province (Frezzi, 1947, 1956, 1960,
1977).
Different groups of crops are affected by the
different Pythium species (Table 3). Pythium
ultimum is the species that mostly affects
ornamental, horticultural and forest crops.
The percentage of each host-Pythium sp.
relationships in Argentina is shown in Fig. 1.
diScuSSion and concluSionS
Most of the work was carried out in Córdoba due
to the existence of a group of researchers devoted
to the study of pathologies that could be caused by
Pythium and Phytophtora. Frezzi’s work marked
a turning point. He is considered a pioneer and
important researcher in Argentine phytopathology.
During his working life he produced the greatest
number of studies which gave rise to two books
about Pythium (Frezzi, 1956, 1977). He condensed
an exhaustive morphological characterization of
the species and also detailed drawings, which were
later references of foreign papers (Frezzi, 1956).
After his death no projects centred on this issue
were carried out, and only new host-Pythium sp.
relations and new localities were reported.
Fig. 1: Percentage of host-pathogen relations of Pythium species found in Argentina. P. acanthicum
(Pac-0,8%), P. aphanidermatum (Pap-8%), P. catenulatum (Pca-1,6%), P. debaryanum (Pde-22,2%), P.
dissotucum (Pdi-1,2%), P. graminicola (Pgr-0,8%), P. intermedium (Pin-1,6%), P. irregulare (Pir-12,9%),
P. mastophorum (Pma-0,8%), P. oligandrum (Pol-3,6%), P. periplocum (Ppe-0,8%), P. polimorphon (Ppo-
1,2%), P. rostratum (Pro-1,2%), P. spinosum (Psp-1,2%), P. tracheiphyllum (Ptra-0,4%), P. torulosum (Pto-
0,4%), P. ultimum (Pul-37,9%), P. vexans (Pve-3,2%).

207
H. E. Palmucci et al. - The genus Pythium in Argentina Bol. Soc. Argent. Bot. 46 (3-4) 2011
Table 2: Distribution of Pythium spp. in geographical regions of Argentina.
Pythium
spp.
Regions and Provinces Prov/
P.sp
NorthWest NortEastern Central West Pampas Patagonia
Juj Sal Tu c Cat SE Mis Cha Ctes ER SF Fsa Cba Mza LR SL SJ BA LP RN Chu SC Neu TF
P. acanthicum X 1
P. aphanidermatum X X X X 4
P. catenulatum X X 2
P. debaryanum X X X X X X X X X X X X X X 14
P. dissotocum X X X 3
P. graminicola X X 2
P. intermedium X X X 3
P. irregulare X X X X X 5
P. mastophorum X 1
P. oligandrum X X 2
P. periplocum X X 2
P. polymorphon X X 2
P. rostratum X 1
P. spinosum X X 2
P. torulosum. X 1
P tracheiphylum X 1
P. ultimum X X X X X X X X X X X X X X 14
P. cf. ultimum X X X X X 5
P. vexans X X X 3
P.spp/province 3 3 7 - - 6 1 4 2 2 2 17 3 2 3 - 6 2 2 1 1 1
Juj=Jujuy; Sal=Salta, Tuc =Tucumán; Cat = Catamarca; SE=Santiago del Estero; Mis =Misiones; Cha= Chaco; Ctes = Corrientes, ER=Entre
Ríos; SF =Santa Fe, Fsa= Formosa; Cba =Córdoba, Mza =Mendoza, LR= La Rioja, SL= San Luis; BA =Buenos Aires; LP= La Pampa; RN=
Rio Negro; Chu =Chubut; SC= Santa Cruz; Neu =Neuquen; TF =Tierra del Fuego y Malvinas).

H. E. Palmucci et al. - The genus Pythium in Argentina
208
Bol. Soc. Argent. Bot. 46 (3-4) 2011
Table 3: Groups of crops affected by each species of Pythium.
Pythium spp. Hosts Horticultural
Crops
Ornamental
Crops
Forest
Crops
Fruit
Crops
Fodder
Crops
Oleaginous/
Industrial
Crops
Cereals Palms
P. acanthicum 2 1 1
P. aphanidermatum 20 12 5 2 1
P. catenulatum 4 4
P. debaryanum 55 14 25 8 1 2 4 1
P. dissotocum 3 1 1 1
P. graminicola 2 1 1
P. intermedium 4 2 2
P. irregulare 32 10 10 4 2 2 3 1
P. mastophorum 2 2
P. oligandrum 9 3 3 2 1
P. periplocum 2 1 1
P. polymorphon 3 1 1 1
P. rostratum 3 1 1 1
P. spinosum 3 1 1 1
P. tracheiphillum 1 1
P. torulosum. 1 1
P. ultimum 93 18 36 24 2 4 6 3
P. vexans 8 1 5 2
P. spp/group* 247 74 87 46 5 11 16 7 2
This revision allowed an updating of the
situation of this genus, and associated hosts,
locations and symptoms. So far 18 species have
been cited affecting 248 hosts in Argentina.
Taxonomic identication was always based only
on morphological features and colony patterns on
different media.
The great number and diversity of Pythium
species in the world suggest that perhaps a wider
variety of pathogenic Pythium species have not
been yet identied in Argentina. Further studies
with an extended range of hosts would be necessary
to determine in detail the diversity of the Pythium
population in different cropped areas. It is hoped
that molecular and secuentiation techniques will
allow a better knowledge of the diversity of
Pythium species present in Argentina
aknowledgementS
To Dr. R. Dehley and Ing. Agr. Carlos Carloni
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Recibido el 2 de agosto de 2010, aceptado el 21 de
diciembre de 2010.