Cesar Ornat

Cesar Ornat
Polytechnic University of Catalonia. Barcelona Tech · DEAB

Dr Biologia

About

71
Publications
8,522
Reads
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927
Citations
Additional affiliations
January 2000 - present
Universitat Politècnica de Catalunya
January 2000 - January 2015
Universitat Politècnica de Catalunya
Position
  • Professor (Associate)
January 1998 - January 2000
IRTA Institute of Agrifood Research and Technology
Position
  • PhD
Education
September 1982 - September 1988
University of Barcelona
Field of study
  • Biology

Publications

Publications (71)
Article
A population of the citrus nematode Tylenchulus semipenetrans Cobb (Tylenchida: Tylenchulidae) associated to a Pasteuria sp. (Bacillales: Bacillaceae) was studied in a naturally infested field. In a first population dynamics study, prevalence never exceed 50 % and showed a density-dependent relationship with the host at 2–3 months time lags, with a...
Conference Paper
Full-text available
Docentes de UPC, UB, UAB, UIB, UOC y URV investigamos sobre una evaluacion formativa "feedforwarding", que realimente de inmediato, que no se limite al "correcto-incorrecto", que guie mas que resuelva, que sea suficientemente individualizada, que motive reflexion - accion y que genere un trabajo sostenible para alumnos y profesores. La aplicacion e...
Data
Full-text available
A population of Meloidogyne javanica virulent to Mi-gene in tomato was identified in Spain. It reproduced similarly on resistant and susceptible tomato cultivars in the greenhouse, microplots, and in the field. In monoxenic cultures, reproduction of the virulent M. javanica was higher than that of an avirulent population on resistant but not on sus...
Article
The relationship between the initial (Pi) and final (Pf) population densities of Meloidogyne javanica and yield of watermelon, Citrullus lanatus, cv. Sugar Baby were determined in pot and field experiments. In the pots, the maximum reproduction rate of the nematode was 14, and the equilibrium density was 49 400 eggs/100 cm3 of soil. Yield data repr...
Article
Full-text available
The present research was undertaken to evaluate the effects of soil temperature on the life cycle of root-knot nematodes (RKN) on zucchini-squash in growth chambers and to assess the relationship between Meloidogyne incognita soil population densities at planting (Pi), its multiplication rate and crop losses of zucchini in field conditions. Thermal...
Article
Several studies were carried out to determine i) thermal requirements for development, egg production and emergence of juveniles, and completion of life cycle of Meloidogyne incognita and M. javanica on cucumber, ii) the maximum multiplication rate and the equilibrium density of root-knot nematodes on cucumber and yield losses in pot and plastic-ho...
Article
Full-text available
A survey was conducted to assess the biodiversity and frequency of infection of fungal egg parasites of Meloidogyne spp. and relate results to soil properties in organic and integrated vegetable production in Spain. Forty sites were sampled at the end of the cropping cycle, 30 under integrated and ten under organic production. Fungal egg parasites...
Article
Full-text available
Information and Communication Technology is playing an important role in assisting teachers in their activities. They became a) more efficient, b) more precise and c) more comprehensive. The “Audio” ad is a clear illustration for this trend. Students’ acceptance of the “Audio” tool has been analysed and compared with the “traditional” correction an...
Article
Meloidogyne is the most important plant-parasitic nematode genus that limits crop yield worldwide. Knowledge of the population dynamic of the nematode and its effect on crop yield, for the most important crops in a growing area, is basic to design integrated nematode management strategies. This information is needed to know if the management method...
Article
Full-text available
Studies on factors affecting root-knot nematode reproduction in tomato rootstocks with the Mi-resistance gene indicated that the resistant response is highly variable and the rootstocks show nematode-isolate specific resistant responses. Repeated cultivation of resistant tomatoes selected Mi-virulent populations from an avirulent one over three cro...
Article
Full-text available
Pathogenicity tests were performed to determine resistance in the wild tomato Solanum huaylasense to four populations of Meloidogyne spp. The S. huaylasense accession LA1358, the root-knot nematode resistant tomato cultivar 'Anairis' and the susceptible tomato cultivar 'Bodar' were assessed against three Miavirulent populations of either Meloidogyn...
Article
Field trials were conducted in a plastic house artificially infested with an avirulent population of Meloidogyne javanica to determine the durability of the resistance mediated by the Mi gene in tomato rootstocks after repeated cultivation for three consecutive years. Treatments included an experimental rootstock cv. PG76 (Solanum lycopersicum × So...
Article
Full-text available
Four crop rotations including the Mi resistant tomato cv. Monika (R) and the susceptible cv. Durinta (S), were assessed for three consecutive cropping seasons in three unheated plastic houses located in northeastern (Barcelona), east (Eivissa) and south-western (Cadiz) Spain. Tomatoes were cultivated from March to July 2005 (1), 2006 (2) and 2007 (...
Article
Full-text available
The response of four Mi-resistance gene tomato rootstocks to seven populations of Meloidogyne was determined in pot tests conducted in a glasshouse. Rootstocks PG76 (Solanum lycopersicum × Solanum sp.) and Brigeor (S. lycopersicum × S. habrochaites) and resistant cv. Monika (S. lycopersicum) were assessed against one population of M. arenaria, thre...
Article
The response of 10 commercial or experimental tomato rootstocks with the Mi resistance gene to an initial inoculum of a Mi-avirulent population of Meloidogyne javanica was determined in pot tests conducted in spring and summer. In a field test, the rootstocks were subjected to continuous exposure to high initial population densities (2050 ± 900 sec...
Article
Full-text available
A survey was conducted from April to June 2002 in 62 orchards o' clementine mandarin grafted on Troyer or Carrizo citrange rootstock in Catalonia (northeastern Spain) to determine the relationship between physicochemical soil properties and Tylenchulus semipenetrans population densities. Soil was analyzed to determine texture, pH, electric conducti...
Chapter
Several vegetables are grown around the Mediterranean basin for fresh consumption as a basic component of the Mediterranean diet, as climate allows cropping thorough all year. A great socioeconomic and cultural diversity makes of this area a mosaic, in which large and small-scale production systems are coexisting. Meloidogyne spp. are the main plan...
Article
Full-text available
Des de l�any 1991, el grup de nematologia UPC-IRTA està treballant en l�epidemiologia i el control de dos dels principals nematodes limitants de la producció vegetal: Meloidogyne en hortalisses i Tylenchulus semipenetrans en cítrics. Els estudis en ambdós sistemes agrícoles han estat dissenyats per: 1) determinar la distribució i l�abundància dels...
Conference Paper
Full-text available
El desarrollo de programas de manejo integrado requiere de modelos de predicción que ayuden a la toma de decisiones. En 1999 iniciamos ensayos para generar una base de datos suficiente para elaborar modelos de predicción de i) pérdidas de producción, ii) desarrollo del nematodo, iii) tasa de multiplicación, y iv) supervivencia. Los ensayos se lleva...
Article
Full-text available
Experiments were conducted to determine the effectiveness and profitability of the Mi-resistance gene in tomato in suppressing populations of Meloidogyne javanica in a plastic-house with a natural infestation of the nematode. Experiments were also conducted to test for virulence and durability of the resistance. Monika (Mi-gene resistant) and Durin...
Article
Full-text available
Growth chamber and plastic tunnel experiments were conducted to compare the ability of a native and introduced isolate of Pochonia chlamydosporia to colonize the rhizosphere of selected plant species and survive in soil. Effects of the isolates on population density of Meloidogyne javanica and yield of tomato after single or multiple fungal applica...
Article
Full-text available
The effects of 1,3 dichloropropene and rootstocks alone and in combination on Tylenchulus semipenetrans population densities and tree growth were evaluated during three years in a nematode-infested citrus orchard. The experiment was a 2 x 2 factorial with six replications. One factor was fumigation and the second, citrus nematode resistant and susc...
Article
The effect of Pochonia chlamydosporia, a facultative fungal parasite of nematode eggs, alone or in combination with oxamyl was evaluated in a double-cropping system of lettuce and tomato in unheated plastic houses infested with Meloidogyne javanica at two sites for two consecutive growing seasons. An additional treatment of methyl bromide fumigatio...
Article
The response of four resistant selections of Cleopatra mandarin × Poncirus trifoliata to increasing inoculum densities of a population of the Mediterranean biotype of Tylenchulus semipenetrans was determined in microplots established at two sites. One-yearold trees of the resistant selections and of a susceptible Carrizo citrange were inoculated wi...
Article
Full-text available
Intensive vegetable production areas were surveyed in the provinces of Almería (35 sites) and Barcelona (22 sites), Spain, to determine the incidence and identity of Meloidogyne spp. and of fungal parasites of nematode eggs. Two species of Meloidogyne were found in Almería-M. javanica (63% of the samples) and M. incognita (31%). Three species were...
Article
Full-text available
A population of Meloidogyne javanica virulent to Mi-gene in tomato was identified in Spain. It reproduced similarly on resistant and susceptible tomato cultivars in the greenhouse, microplots, and in the field. In monoxenic cultures, reproduction of the virulent M. javanica was higher than that of an avirulent population on resistant but not on sus...
Article
Full-text available
Population densities of the Mediterranean biotype of Tylenchulus semipenetrans were monitored in soil and citrus roots at 3-month intervals for 3 consecutive years in four citrus orchards in the provinces of Tarragona (Amposta and Xalamera) and Valencia (Moncada and Ca rcer). Nematode population densities in soil peaked once a year in April or July...
Article
Full-text available
Changes in population densities of root-knot nematodes after short-term clean-fallow periods between successive crops were estimated in intensive vegetable cropping systems for greenhouse and outdoor crops. The effect of root destruction during fallow on population decline of Meloidogyne arenaria race 2 and Pratylenchus neglectus was also determine...
Article
Full-text available
Se realizó un muestreo para detectar la presencia de Meloidogyne spp. en cultivos hortícolas de la comarca de El Maresme (Barcelona). Se muestrearon 50 parcelas de invernadero y 30 de aire libre durante la campaña agrícola de 1994. Las muestras se tomaron justo antes de plantar y al finalizar la cosecha de cada uno de los cultivos realizados en esa...
Article
Full-text available
The occurrence of Pasteuria spp. In Spanish oils is reported. A total of 160 soil samples were collected from vegetable crops, kiwi and citrus orchards, and deciduous fruit trees. Bacteria were found associated with six nematode genera but they were only observed within females of Meloidogyne spp., second-stage juveniles and males of Tylenchulus se...
Article
Los patrones de tomate se han propuesto como una alternativa no química al uso del bromuro de metilo. En este estudio se evaluó la respuesta de resistencia de diez patrones de tomate (comerciales y experimentales) a nematodos del género Meloidogyne mediante un ensayo de campo realizado en un invernadero de plástico cuyo suelo se hallaba infestado p...

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