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Tsagkarakis A.E.,Agricultural University of Athens | Kalaitzaki A.P.,Ministry of Rural Development and Food | Lykouressis D.P.,Agricultural University of Athens
Phytoparasitica | Year: 2013

The relative abundance as well as the percentage of parasitism of Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae) and its parasitoids were studied in a citrus orchard with orange, mandarin and lemon trees in Greece. Infestation of P. citrella on each citrus host, as expressed by the number of mines per leaf, was significantly higher on lemon than on mandarin. The P. citrella parasitoid complex included the native species Neochrysocharis formosa and Pnigalio pectinicornis, as well as the introduced Citrostichus phyllocnistoides. The most abundant of those was N. formosa in all of the citrus species. The average percentage of parasitism was 13.1%, 13.8% and 11.7% on orange, mandarin and lemon, respectively. No significant differences in parasitism rate by each of the three parasitoid species separately were recorded among the three citrus species. © 2012 Springer Science + Business Media B.V.


Makri A.,Ministry of Rural Development and Food | Koutsouris A.,Agricultural University of Athens
Agricultural Economics Review | Year: 2015

The current paper aims at exploring innovation networking practices among the members of two Producer Groups (PGs) in Ierapetra area, Crete. Results show that the first PG's members are better incorporated in the PG's innovation network(s) as well as that its leaders are conceived of as innovators. On the contrary, the innovation network of the second PG is highly fragmented and dependent on the leaders of the first PG. These results have implications in terms of the PGs' innovation capacity as well as of extension work, especially with a view to current developments in both Greece and the EU.


Kavallieratos N.G.,Benaki Phytopathological Institute | Athanassiou C.G.,University of Thessaly | Vayias B.J.,Ministry of Rural Development and Food | Tomanovic Z.,University of Belgrade
Journal of Food Protection | Year: 2012

Insect growth regulators (IGRs) (two juvenile hormone analogues [fenoxycarb and pyriproxifen], four chitin synthesis inhibitors [diflubenzuron, flufenoxuron, lufenuron, and triflumuron], one ecdysteroid agonist [methoxyfenozide], and one combination of chitin synthesis inhibitors and juvenile hormone analogues [lufenuron plus fenoxycarb]) were tested in the laboratory against adults of Prostephanus truncatus in maize and against adults of Rhyzopertha dominica in wheat. The tested IGRs were applied in maize at three doses (1, 5, and 10 ppm) and assessed at three temperature levels (20, 25, and 30°C) in the case of P. truncatus, while in the case of R. dominica the above doses were assessed only at 25°C in wheat. In addition to progeny production, mortality of the treated adults after 14 days of exposure in the IGR-treated commodities was assessed. All IGRs were very effective (>88.5% suppression of progeny) against the tested species at doses of ≥5 ppm, while diflubenzuron at 25°C in the case of P. truncatus or lufenuron and pyriproxyfen in the case of R. dominica completely suppressed (100%) progeny production when they were applied at 1 ppm. At all tested doses, the highest values of R. dominica parental mortality were observed in wheat treated with lufenuron plus fenoxycarb. Temperature at the levels examined in the present study did not appear to affect the overall performance in a great extent of the tested IGRs in terms of adult mortality or suppression of progeny production against P. truncatus in treated maize. The tested IGRs may be considered viable grain protectants and therefore as potential components in stored-product integrated pest management. Copyright © International Association for Food Protection.


Alexandridis A.,Technological Educational Institute of Athens | Russo L.,CNR Institute for Research on Combustion | Vakalis D.,Ministry of Rural Development and Food | Bafas G.V.,National Technical University of Athens | Siettos C.I.,National Technical University of Athens
International Journal of Wildland Fire | Year: 2011

We show how microscopic modelling techniques such as Cellular Automata linked with detailed geographical information systems (GIS) and meteorological data can be used to efficiently predict the evolution of fire fronts on mountainous and heterogeneous wild forest landscapes. In particular, we present a lattice-based dynamic model that includes various factors, ranging from landscape and earth statistics, attributes of vegetation and wind field data to the humidity of the fuel and the spotting transfer mechanism. We also attempt to model specific fire suppression tactics based on air tanker attacks utilising technical specifications as well as operational capabilities of the aircrafts. We use the detailed model to approximate the dynamics of a large-scale fire that broke out in a region on the west flank of the Greek National Park of Parnitha Mountain in June of 2007. The comparison between the simulation and the actual results showed that the proposed model predicts the fire-spread characteristics in an adequate manner. Finally, we discuss how such a detailed model can be exploited in order to design and develop, in a systematic way, fire risk management policies. © 2011 IAWF.


Dovas C.I.,Aristotle University of Thessaloniki | Papanastassopoulou M.,Aristotle University of Thessaloniki | Georgiadis M.P.,Aristotle University of Thessaloniki | Chatzinasiou E.,Aristotle University of Thessaloniki | And 2 more authors.
Applied and Environmental Microbiology | Year: 2010

Routes of avian influenza virus (AIV) dispersal among aquatic birds involve direct (bird-to-bird) and indirect (waterborne) transmission. The environmental persistence of H5N1 virus in natural water reservoirs can be assessed by isolation of virus in embryonated chicken eggs. Here we describe development and evaluation of a real-time quantitative reverse transcription (RT)-PCR (qRT-PCR) method for detection of H5N1 AIV in environmental water. This method is based on adsorption of virus particles to formalin-fixed erythrocytes, followed by qRT-PCR detection. The numbers of hemagglutinin RNA copies from H5N1 highly pathogenic AIV particles adsorbed to erythrocytes detected correlated highly with the infectious doses of the virus that were determined for three different types of artificially inoculated environmental water over a 17-day incubation period. The advantages of this method include detection and quantification of infectious H5N1 AIVs with a high level of sensitivity, a wide dynamic range, and reproducibility, as well as increased biosecurity. The lowest concentration of H5N1 virus that could be reproducibly detected was 0.91 50% egg Infective dose per ml. In addition, a virus with high virion stability (Tobacco mosaic virus) was used as an internal control to accurately monitor the efficiency of RNA purification, cDNA synthesis, and PCR amplification for each individual sample. This detection system could be useful for rapid high-throughput monitoring for the presence of H5N1 AIVs in environmental water and in studies designed to explore the viability and epidemiology of these viruses in different waterfowl ecosystems. The proposed method may also be adapted for detection of other AIVs and for assessment of their prevalence and distribution in environmental reservoirs. Copyright © 2010, American Society for Microbiology. All Rights Reserved.


Alexandridis A.,Technological Educational Institute of Athens | Russo L.,CNR Institute for Research on Combustion | Vakalis D.,Ministry of Rural Development and Food | Siettos C.I.,National Technical University of Athens
Chemical Engineering Transactions | Year: 2011

This paper presents a computational methodology for predicting the evolution of fire fronts on wild forest landscapes, based on Cellular Automata (CA). The CA framework takes into account various microscopic/detailed and macroscopic factors that affect the spread of fire including the vegetation type, density and height, the wind field, the terrain slope, the spotting fire transfer mechanism as well as suppression tactics. The model was successfully applied to a large scale wildfire that occurred in the mountain of Parnitha, Greece in 2007. © 2011, AIDIC Servizi S.r.l.


Costopoulou D.,Greek National Center For Scientific Research | Vassiliadou I.,Greek National Center For Scientific Research | Chrysafidis D.,General Chemical State Laboratory Food Division | Bergele K.,General Chemical State Laboratory Food Division | And 3 more authors.
Chemosphere | Year: 2010

During the summer of 2007, a series of massive forest fires broke out in several areas across Greece. The main sources of PCDD/Fs and dioxin-like PCBs in Greece are considered to be the uncontrolled combustion of municipal solid waste in open landfills and accidental fires in forest, rural and industrial areas. Combustion may also lead to the formation of PAHs, which are fat soluble substances of considerable toxicity. The objective of this study was to investigate PCDD/F, dioxin-like PCB and PAH contamination of olive oil produced in fire-affected areas. Olive oil is a very significant agricultural product of Greece. Samples for this study were collected from all affected oil producing areas after the fire and 1 year later. PCDD/Fs, dioxin-like PCBs and PAHs were at normal levels in all samples analysed. © 2010 Elsevier Ltd. All rights reserved.


Russo L.,CNR Institute for Research on Combustion | Russo P.,University of Rome La Sapienza | Vakalis D.,Ministry of Rural Development and Food | Siettos C.,National Technical University of Athens
Chemical Engineering Transactions | Year: 2014

In this work, we propose a risk-assessment approach based on Cellular Automata (CA) simulations which incorporate both theoretical/ first principles and (semi)empirical fire behavioural models. The proposed approach can deal with spatial heterogeneity in both the fuel and landscape characteristics, can be coupled with Geographical Information Systems (GIS) and can take as input local meteorological data (even in real time). Using the CA model we are able to construct the topographic map of hazard intensity defined in terms of the expected burned area resulting from an ignition in a particular point of the region under surveillance. For our illustrations we used the case of Spetses Island whose a major part of its forest burned in 1990. Using the proposed framework, we revealed the weak points of fire spread risk, i.e. potential ignitions points which result to maximum likelihood of burned area. © Copyright 2014, AIDIC Servizi S.r.l.


Russo L.,CNR Institute for Research on Combustion | Vakalis D.,Ministry of Rural Development and Food | Siettos C.,National Technical University of Athens
Chemical Engineering Transactions | Year: 2013

We demonstrate how a cellular automata modelling approach offers a suitable method to develop a real time simulator able to describe the evolution of a fire front on higlhy heterogeneous landscapes. Importantly, we show that, differently from other approaches like CFD simulations in the continuum, a micro-simulator based on a cellular automata can be used for real-time and mutil-time assessement as the computational time that takes to run a compete simulation is of orders of magnitude shorter than the time period during which a real fire incident develops. The model takes into account factors such as the type and density of vegetation, the wind speed and direction and the spotting phenomenon. The model is used to simulate the wildfire that destroyed part of Rhodes in July of 2008. The model parameters have not been adjusted to fit the real incident; they have been kept at the values used to simulate other large-scale wild fires such as the fires of Parnitha in 2008 (Alexandridis et al., 20011) and the fire in Spetses in 1990 (Alexandridis et al., 2008). The comparison between the simulation and the real data obtained from Geographical Information Systems (GIS) showed that the model predicts efficiently the spatio-temporal evolution of the real incident and as such could be potentially used to develop a risk-management tool for controlling and assess wildland forest fires in heterogeneous landscapes. Copyright © 2013, AIDIC Servizi S.r.l.


Roukos C.H.,Ministry of Rural Development and Food
Bulgarian Journal of Agricultural Science | Year: 2016

The growth and nutritional quality of kermes oak (Quercus coccifera L.) are affected by climatic environment and stage of maturity. The study aimed to determine changes in the nutritional quality of kermes oak components (i.e., twigs and leaves) in shrublands across a mountainside, where climatic conditions change with altitude above sea level, in northwest Greece. The study involved monthly collection of forage samples during March-October from 15 experimental plots located in three altitudinal zones (lower, middle, and upper) over two consecutive years. Samples were manually separated into the two shrub components and analyzed for crude protein (CP), neutral detergent fiber (aNDFom), acid detergent fiber (ADFom), lignin(sa), in vitro dry matter (DM) digestibility (IVDMD), in vitro neutral detergent fiber digestibility (IVNDFD), digestible energy (DE) and minerals (i.e., Ca, P). Altitudinal zone, in terms of existing climatic conditions, strongly affected the nutritive value of leaves and twigs. Indeed, altitude above sea level was positively correlated with mean monthly precipitation and negatively correlated with mean monthly air temperature, which, in turn, strongly influenced CP, IVDMD, IVNDFD, fiber contents, DE, and mineral contents. The Ca:P ratio exceeded the animal functional disorder threshold, which posed a hazard. © 2016, National Centre for Agrarian Sciences. All rights reserved.

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