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Pagan E.,Technical University of Cartagena | Perez-Pastor A.,Technical University of Cartagena | Perez-Pastor A.,CSIC - Center of Edafology and Applied Biology of the Segura | Perez-Reverte R.,Technical University of Cartagena | And 6 more authors.
Acta Horticulturae | Year: 2011

The quality of 'Fortune' mandarin fruit (Citrus clementina Hort. Ex. Tanaka x C. reticulata Blanco) subjected to four different drip irrigation treatments was studied at harvest and after a subsequent storage period of 50 days at 5°C plus a shelf-life period of 8 days at 20°C. Irrigation treatments consisted of a control (CTL) irrigated at 130% of crop evapotranspiration (ETc) throughout the season, and three regulated deficit irrigation (RDI) regimes. These treatments were irrigated as a CTL except during the non critical periods, when different percentage of the control were applied: 50% during stage I and beginning of stage II in RDI 1 and RDI 2 treatments, and 80 and 200% during stage III in RDI 1 and RDI 2, respectively. RDI 3 was irrigated at 50% of RDI 1 during the water deficit periods. The electrical conductivity of the irrigation water averaged 4.23 dS m -1. RDI treatments promoted a water stress integral, derived from stem water potential at midday values, of 56, 46 and 114 MPa day for RDI 1, RDI 2 and RDI 3, respectively. Fruit at harvest from RDI 1 and RDI 3 treatments showed around 15% higher total soluble solids and 11 and 19% higher levels of titratable acidity, respectively than CTL (13.8°Brix and 20.3 g L -1 citric acid). RDI fruits showed about 5-10% lower values of extractable juice than control. The storage period reduced fruit titratable acidity compared with harvest levels. Weight loss in control fruit reached 1.4 or 2.3% w/w at the end of cold storage or shelf-life, respectively, while in RDI treatments were reduced by 0.2-0.4% w/w. Overall, the effect of water stress on fruit quality were more pronounced at harvest than after the postharvest treatments. Under water scarcity conditions RDI 1 showed acceptable fruit quality at harvest and increased storability of mandarin fruit, saving considerable amounts of water. Source


Sanchez J.A.,Instituto Murciano Of Investigacion Y Desarrollo Agrario | Ortin-Angulo M.C.,Instituto Murciano Of Investigacion Y Desarrollo Agrario
Crop Protection | Year: 2012

The abundance and population dynamics of the pear psyllid Cacopsylla pyri L. and its potential natural enemies were followed in pear orchards in southern Spain. The fieldwork was carried out from 2007 to 2010 in two chemically-treated and two non-treated orchards. The abundance of C. pyri gradually decreased through the years in both treated and non-treated orchards, but it reached lower levels in the former than in the latter. In the fourth year of the study the abundance of C. pyri was low in both orchards and the incidence of russet acceptable. Ants, spiders and the mirid Pilophorus gallicus Remane were the most abundant potential natural enemies interacting with C. pyri. The population of these predators progressively increased through the years in treated and non-treated orchards, although, the abundance of natural enemies was higher in the latter. P. gallicus reached high numbers at the same time as C. pyri and was probably responsible for controlling the psyllid outbreak in spring. Ants were abundant and may prey on C. pyri but also protect pear psyllid nymphs in exchange for honeydew. The increase in the number of spiders in summer was associated with a decrease in the number of ants and P. gallicus. Spiders could keep C. pyri at low levels during summer and autumn, which might reduce the number of overwintering adults and subsequent population growth in spring. The overall parasitism rates of C. pyri nymphs were low; Trechnites insidiosus (Crawford) was the only species of parasitoid found, together with the hyperparasitoid Aphidencyrtus mamitus Walker. © 2011 Elsevier Ltd. Source


Lopez-Perez A.J.,Instituto Murciano Of Investigacion Y Desarrollo Agrario | Rodriguez-Carrion M.J.,Instituto Murciano Of Investigacion Y Desarrollo Agrario | Hernandez-Perez V.,Instituto Murciano Of Investigacion Y Desarrollo Agrario | Almela L.,University of the Basque Country | Martinez J.A.,Instituto Murciano Of Investigacion Y Desarrollo Agrario
Acta Horticulturae | Year: 2013

Vegetative propagation by ovoli in artichoke is an interesting technique that is not fully introduced in Spain. Agronomic behaviour was studied in three artichoke cultivars 'Thema', 'Romanesco' and 'Spinoso Sardo' propagated by ovoli. Influence of ovoli size on production and earliness was estimated in this primary study. Per each cultivar, ovoli were divided in two groups and designed as big size ovoli (50-80 mm) or small size ovoli (<50 mm). The production of plants derived from big size ovoli was not significant compared with small size ovoli production. Only 'Romanesco' showed statistical differences with the big size ovoli more productive (2.66 kg/plant) than small size ones (1.17 kg/plant). Earliness was not influenced by ovoli size in 'Romanesco' and 'Spinoso Sardo'. On the contrary, differences were found in 'Thema' where early production was higher (65%) in plants derived from big size ovoli than in small size ovoli (25%). Source


Romeu J.,Instituto Murciano Of Investigacion Y Desarrollo Agrario | Garcia-Brunton J.,Instituto Murciano Of Investigacion Y Desarrollo Agrario
Acta Horticulturae | Year: 2012

The cultivar adaptation to different zones is influenced by the behaviour of the tree in front of several environmental conditions. In this study, the behaviour in the Region of Murcia of 10 low chill cultivars has been assessed such as 'Red Candem', 'Flor Red', 'Flordastar', 'Suncoast', NIV 30/02 selection, NIV 10/03 selection, NIV 11/03 selection, '86/6' and 'Spring Crest' and 'Romea' with high chill requirement. Shoots characterisation, tracking phenology and the fruit quality (firmness, soluble solid, acidity parameters and SS/Ac index) have been carried out. Some differences have been seen between the cultivars in the bud density (fluctuating between 133,8 buds/m for NIV 10/03 and 53,5 buds/m for 'Spring Crest'), in the flower density (115,2 flowers/m for NIV 10/03 and 42,4 flowers/m for 'Red Candem') and in the blossom and harvest dates, clearly influenced by the temperatures and the difference in chill and heat requirement. In addition, our observations have shown differences in fruit quality for different pickings in most of the cultivars. © ISHS 2012. Source

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