Cotton seedling disease complex in Andalucia
Melero Vara J.M., Diaz R.M.
in
Braud M. (ed.), Campagne P. (ed.).
Le coton en Méditerranée et au Moyen-Orient Montpellier : CIHEAM
Options Méditerranéennes : Série Etudes; n. 1988-I 1988
pages 223-224
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--- Melero Vara J.M., D iaz R.M. Cotton seedlin g disease complex in An dalu cia. In : Braud M. (ed.), Campagne P. (ed.). Le coton en Méditerranée et au Moyen-Orient. Montpellier : CIHEAM, 1988. p. 223- 224 (Options Méditerranéennes : Série Etudes; n. 1988-I)
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Atelier : Protection des cultures Cotton seedling disease complex in
Andalucia
J.
Catedra de Patologia Vegetal - Escuela Técnica Superior de Ingenieros Agronomos - Universitad de Cordoba
Departamento de Próteccion Vegetal - Dirección General de Investigación Extension Agrarias - Junta de Andalucia - Cordoba
of
of the Even in by this disease '.
U.S. by cotton
2.9%
to Council.
damping-off has been
of was a
lack of on
and etiology of that complex We of
aspects of the Spain.
of 1980-
1984. we inspected a total of 164
isolation of the pathogens involved in the disease complex.
The disease the
of post- in 96% of the fields inspected. Also, lack of
86% of the fields inspected
of 8.2%. of
seedling death exceeded 50% occasionally, but it was than 10%
of (6.6 -
9.4Oh). of
has been
including the occasional death of plants which had developed beyond
it
collapsed cotyledons in the absence of hypocotyl
a consistent lack of fungal
a n abiotic et-iology.
We also found a of
symptoms of the disease complex, which again is a n abiotic component in the
etiology of of
cotton seedlings in Andalucia.
~~ ~~~~~ ~ ~ ~ ~
CIHEAM - Options Mediterraneennes
affected of isolation, established hizoctonia solani as the most studies on
the etiology of of the
of of solani, to
belong to
solani, we to be
involved in the etiology of the cotton disease complex, namely
palmivore Al, Thielauiopsis basicola and Fusarium spp.
was isolated with low
symptomatic seedlings. We believe that the low a
of this pathogen in the disease complex, as it could be
damping-off. No
seedlings affected by damping-off.
of ultimum used in the
of to
induce a high incidence of the
of the host.
palmiuora two fields in
1984, a We
believe
time as a pathogen of of
palmiuora
tests, indicating that it could be a potentially of the complex. These
224
isolates cause a,sudden death of the seedlings
T . basicola was isolated with low affected
was
of Fusarium mild symptoms, as well as
showed that most of t h e Fusarium
as pathogens of cotton seedlings as it is the a of i s o l a t e s of F . oxysporum, F . solani
ofF. equiseti, be
disease complex is
it is influence the disease in the complex. That is complicated by of pathogens involved.
is now
Aknowledgment
by 0349/81
of Education and Science.
