References of "Lognay, Georges"
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See detailIdentification of 1-methyloctyl butanoate as the major sex pheromone component from females of the saddle gall midge, Haplodiplosis marginata (Diptera: Cecidomyiidae)
Censier, Florence ULiege; Fischer, Christophe ULiege; Laurent, Pascal et al

in Chemoecology (2014)

The saddle gall midge, Haplodiplosis marginata (von Roser) (Diptera: Cecidomyiidae), has undergone a resurgence recently as a pest of cereals in Belgium and other European countries. An effective ... [more ▼]

The saddle gall midge, Haplodiplosis marginata (von Roser) (Diptera: Cecidomyiidae), has undergone a resurgence recently as a pest of cereals in Belgium and other European countries. An effective monitoring tool of saddle gall midge flights is needed in order to understand the enigmatic population dynamics of this pest, and to design an integrated management strategy. Therefore, volatile compounds emitted by females (alkan-2-ols and alk-2-yl butanoates) were identified, and the chirality of the emitted esters was determined to be the R absolute configuration. In field-trapping experiments, racemic non-2-yl butanoate attracted substantial numbers of H. marginata males. Thus, this compound will be useful in baited traps for monitoring seasonal flight patterns, and improving integrated management of the saddle gall midge in agricultural systems. [less ▲]

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See detailVOC emissions and protein expression mediated by the interactions between herbivorous insects and Arabidopsis plant. A review
Hien, Truong Thi Dieu ULiege; Heuskin, Stéphanie ULiege; Delaplace, Pierre ULiege et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(3), 455-464

Herbivorous insects, such as phloem-sap feeders and chewers, induce resistance response in plants. There is a long-standing hypothesis that herbivores increase the emission of volatile organic compounds ... [more ▼]

Herbivorous insects, such as phloem-sap feeders and chewers, induce resistance response in plants. There is a long-standing hypothesis that herbivores increase the emission of volatile organic compounds (VOCs) in the Arabidopsis plant model. However, most works were restricted to the study of the regulation of plant VOC emissions and only in some cases to the effects of insects on such emissions. Often these investigations do not establish a link between quantitative and qualitative emission of plant VOCs with actual damages caused by insects. Moreover, information remain limited about the processes that occur at the protein level encoded of the host plant under stress conditions. Here, we briefly summarize the effects of specific chewing and phloem-sap feeding insects on the emission of VOCs by Arabidopsis thaliana Col-0, and review some predictions about pathogenesis-related proteins, based on current evolutionary hypotheses. Further investigation of the effects of herbivorous insects on VOC emissions and protein expression is expected to improve our knowledge about their patterns and functions in plant responses to stresses. [less ▲]

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See detailMicroorganism-associated semiochemicals reduce the size of aphid populations in potato fields
Alabi, Taofic ULiege; Brostaux, Yves ULiege; Grigorescu, Alina ULiege et al

in Revue des Régions Arides (2014), 35

The chemical cues released by many insect species, including agricultural pests, are used by predators and parasitoids to locate their prey or host. For instance, aphids excrete honeydew, which contains ... [more ▼]

The chemical cues released by many insect species, including agricultural pests, are used by predators and parasitoids to locate their prey or host. For instance, aphids excrete honeydew, which contains bacteria that produce semiochemicals. Ladybeetles and hoverflies use these semiochemicals to locate the colonies of prey aphid species. One bacterium (Staphylococcus sciuri) has been identified in the honeydew of the pea aphid, Acyrthosiphon pisum. This bacterium is responsible for the production of kairomonal substances, which guide hoverflies to aphid colonies. In the present study, we cultivated S. sciuri, and used solid-phase microextraction (SPME) to confirm the ability of this bacterium to produce 3-methyl-2-butenal and 3-methyl-2-butenoic acid, which previous studies have demonstrated as being the two semiochemicals that exhibit kairomonal activity. We subsequently conducted field experiments to evaluate the efficiency of two solutions as biological products to control aphid populations inhabiting potato plants; the first solution contained a suspension of living S. sciuri, and the second solution contained a mixture of the two semiochemicals produced by this bacterium. While the semiochemical solution did not lead to a significant reduction in aphid number, potato plants treated with the S. sciuri solution were infested with 28% less aphids compared to untreated plants. This study demonstrates the potential of using naturally occurring bacteria as a form of biological control of aphid infestations in agricultural management. [less ▲]

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See detailAcar'up, a new trapping device for house dust mites
Mailleux, Anne-Catherine; Deneubourg, Jean-Louis; Detrain, Claire et al

Poster (2014)

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See detailHow to get rid of the two spotted spider mites?
Attia, Sabrine; Grissa, Kaouthar Lebdi; Heuskin, Stéphanie ULiege et al

in Revue des Régions Arides (2014), 35(3), 1739-1748

Two essential oils were tested for their toxicity against eggs and adults of Tetranychus urticae Koch as well as adults of Phytoseiulus persimilis Athias-Henriot, by using a filter paper diffusion ... [more ▼]

Two essential oils were tested for their toxicity against eggs and adults of Tetranychus urticae Koch as well as adults of Phytoseiulus persimilis Athias-Henriot, by using a filter paper diffusion bioassay without allowing direct contact. Responses varied according to oil type and dose, and mite species. The chemical analyses with GC-MS and GC-FID revealed that the two oils differed in their most abundant components. The most abundant components in the Citrus oil were linalyl acetate (41.95%), sabinene (18.60%) and linalool (18.14%) whereas pulegone (41.86%) and menthone (28.33%) were most prevalent in the Mentha oil. Mortality and fecundity were measured with 15 oils concentrations ranged from 0.01 to 8μl/l of air. Tetranychid mortality increased with increasing concentrations with LC50 value of 5.39 and 4.09 μl/l for C. aurantium and M. pulegium, respectively. However few mortality was observed in the case of P. persimilis with LC50 value of 0.46 and 0.26 μl/l for C. aurantium and M. pulegium respectively. For both oils a reduction of fecundity was observed at 0.01 μ/l in the case of T. urticae. The essential oils described herein have potential interest as fumigants for the bio-control of T. urticae. [less ▲]

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See detailWhole-genome sequence of Serratia symbiotica strain CWBI-2.3T, a free-living symbiont of the Black Bean Aphid Aphis fabae
Foray, Vincent; Grigorescu, Alina ULiege; Sabri, Ahmed et al

in Genome Announcements (2014), 2(4),

The gammaproteobacterium Serratia symbiotica is one of the major secondary symbionts found in aphids. Here, we report the draft genome sequence of S. symbiotica strain CWBI-2.3T, previously isolated from ... [more ▼]

The gammaproteobacterium Serratia symbiotica is one of the major secondary symbionts found in aphids. Here, we report the draft genome sequence of S. symbiotica strain CWBI-2.3T, previously isolated from the black bean aphid Aphis fabae. The 3.58-Mb genome sequence might provide new insights to understand the evolution of insect-microbe symbiosis. [less ▲]

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See detailComposition chimique et activité antimicrobienne de l’huile essentielle de Thymus vulgaris du Nord d’Algérie
Sidali, L.; Brada, M.; Fauconnier, Marie-Laure ULiege et al

in PhytoChem & BioSub Journal (2014), 8(3), 156-161

Twenty five constituents were identified by GC MS analysis of essential loils from. Thymus vulgaris. The main compounds identified were carvacrol (55,2%),γ-terpinene (12,6%), p-cymene (9,3%), linalol (3,9 ... [more ▼]

Twenty five constituents were identified by GC MS analysis of essential loils from. Thymus vulgaris. The main compounds identified were carvacrol (55,2%),γ-terpinene (12,6%), p-cymene (9,3%), linalol (3,9%) and α-terpinene (2,8%). The obtained Essential oils exhibited antibacterial and antifungal activities against S.P. Sterptococcus, staphylococcus aureus, E.coli, Klebscila and condidat albicans. [less ▲]

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See detailRole of larval host plant experience and solanaceous plant volatile emissions in Tuta absoluta (Lepidoptera: Gelechiidae) host finding behavior
Caparros Megido, Rudy ULiege; De Backer, Lara; Ettaïb, Refki et al

in Arthropod-Plant Interactions (2014)

The tomato leafminer, Tuta absoluta (Lepi- doptera: Gelechiidae), is considered to be a major pest that damages tomato (Solanum lycopersicum L; Solanaceae) crops in South American, European, and ... [more ▼]

The tomato leafminer, Tuta absoluta (Lepi- doptera: Gelechiidae), is considered to be a major pest that damages tomato (Solanum lycopersicum L; Solanaceae) crops in South American, European, and Mediterranean countries. This insect species is polyphagous (i.e., feeds on many types of food); hence, it could also develop on other cultivated host plants, principally solanaceous plants, such as potato (S. tuberosum L.; Solanaceae) and eggplant (S. melongena L.; Solanaceae). Therefore, we tested the hypothesis that host plant choice by adult T. absoluta is influenced by plant volatile organic compounds and larval host plant experience. One tomato cultivar (cv.) ‘Money- maker’ and three potato cv. ‘Charlotte’ ‘Bintje,’ and ‘Nicola’ were tested. Using a flying tunnel, we observed that females reared on tomato preferred flying toward tomato and, to a lesser extent, potato cv. ‘Charlotte.’ These preferences might be explained by the high release of terpenes by these two plants. When conducting oviposition choice assays, we found no preference between tomato and potato in the number of eggs laid by females that had been previously reared on either host plant. This study indicates that the host finding behavior of T. absoluta is mediated by solanaceous volatiles, while oviposition behavior appears to depend on additional stimuli. These results provide baseline information for use in the development of new control strategies against T. absoluta using semiochemicals and plant breeding. [less ▲]

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See detailThe facultative bacterial symbiont Serratia symbiotica in Acyrtosiphon pisum confer resistance to Aphidius ervi
Attia, Sabrine; Foray, Vincent; Louâpres, Philippe et al

Poster (2014)

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See detailDoes the facultative bacteria Serratia symbiotica influence the foraging strategies of aphid parasitoids?
Attia, Sabrine; Louâpre, Philippe; Foray, Vincent et al

Poster (2014)

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See detailA volatile sex pheromone in the invasive ladybeetle Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)
Fassotte, Bérénice ULiege; Fischer, Christophe ULiege; Durieux, Delphine ULiege et al

in Communications in Agricultural and Applied Biological Sciences (2014), 79(1), 79-81

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See detailDétermination de la teneur en équol dans les laits commercialisés en Wallonie (Belgique)
Daems, Frédéric ULiege; Jasselette, Christophe; Franckson, Delphine et al

Poster (2013, December 04)

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See detailTechnologie de production de masse d’insectes - INSECTECH
Richard, Gaetan ULiege; Hance, Thierry; Fauconnier, Marie-Laure ULiege et al

Report (2013)

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See detailPhysicochemical properties of lipids extracted from Tenebrio molitor larvae
Danthine, Sabine ULiege; Blecker, Christophe ULiege; Paul, Aman ULiege et al

Poster (2013, December)

Objectives: To determine the physicochemical properties of the oil obtained from Tenebrio molitor Larvae and explore its potential as edible oil. Methodology: Oils obtained from five batches of Tenebrio ... [more ▼]

Objectives: To determine the physicochemical properties of the oil obtained from Tenebrio molitor Larvae and explore its potential as edible oil. Methodology: Oils obtained from five batches of Tenebrio molitor Larvae were investigated. Among the samples, three were produced directly in the lab (3 different productions) and 2 were purchased from a local supplier. In addition to the total lipid content (solvent extraction), both FA (GC) and TAG (HPLC) profiles were determined. Thermal properties by DSC were also estimated. Results and conclusion: The fresh Larvae from the lab contained 52% of total proteins (% dry matter). Their total fat content was around 36% (% dry matter). The commercial samples contained more proteins, but less fat: around 58% of total proteins and 30% of total fat (% dry matter). All the extracted oils contained high amount of unsaturated fatty acids. However, the chemical composition and the thermal properties of the samples varied according to their origin. The level and quality of lipid content offer potential as a substitute of oilseeds. [less ▲]

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See detailLes Ressources Sauvages des Bois de Tapia (Uapaca bojeri) à Madagascar
Barsics, Fanny ULiege; Malaisse, François ULiege; Razafimanantsoa, Tsiresy et al

Poster (2013, October 19)

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See detailFood intake of Tibetan children living in Kashin Beck disease endemic areas in Central Tibet
Rooze, Shancy; de Voghel, Pauline; Mathieu, Françoise et al

Conference (2013, October 14)

Introduction: Kashin-Beck disease (KBD) is a bone and joint pathology. KBD begins during childhood, causes deformities, pain, lack of mobility, and short stature. The pathophysiology of the disease is ... [more ▼]

Introduction: Kashin-Beck disease (KBD) is a bone and joint pathology. KBD begins during childhood, causes deformities, pain, lack of mobility, and short stature. The pathophysiology of the disease is unknown. Nutrition possibly plays a role. Children living in KBD endemic areas in Central Tibet present severe growth retardation, signs of chronic malnutrition and a high prevalence of rickets. A food consumption study was conducted. We have focused our attention on total energy intake, calcium, phosphorus and vitamin D. Material and methods: Prospective food intake measurements have been performed. The investigation concerned children from 9 to 16 years old living in KBD endemic areas. All food and drinks have been measured during several days at the 4 seasons of the year. Anthropometric data were obtained. Results: 30,5% of the children presented with stunting (height for age ratio below -2 z score); 13,8% of the cohort suffered from acute malnutrition (body mass index below -2 z score). Mean total energy intake was 87% of the recommended value. Calcium and vitamin D intakes never covered the needs (44 % and 14 %, respectively). Phosphorus intake was high. Mean Ca / P ratio was 0.54. Conclusion: Calcium and vitamin D deficiency may play a role in the etiology of bone and joint diseases in this population. To improve the nutritional status of the children, a large program of calcium and vitamin D supplementation among 0 - 5 years old children living in KDB endemic areas was started. Besides, chemical analyses of locally grown foods are performed, in order to have a more precise evaluation of nutrient intake. In the future, the effect of increased energy intakes will be evaluated. [less ▲]

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See detailFirst Evidence of a Volatile Sex Pheromone in Harmonia axyridis (Pallas)
Fassotte, Bérénice ULiege; Fischer, Christophe ULiege; Durieux, Delphine ULiege et al

Poster (2013, October)

Until now, no volatile sex pheromone has been highlighted in Coccinellidae but various studies have suggested the existence of such molecules. In the present work, we have sampled volatile organic ... [more ▼]

Until now, no volatile sex pheromone has been highlighted in Coccinellidae but various studies have suggested the existence of such molecules. In the present work, we have sampled volatile organic compounds released in the headspace of virgin females in the multicolored Asian ladybeetle, Harmonia axyridis (Pallas), that were either allowed or not to feed on pea aphids (Acyrthosiphon pisum Harris). When fed on aphids, virgin females showed a stereotypical “calling behavior”, commonly associated with the emission of a sex pheromone in several Coleoptera species. Behavioral assays conducted with calling females in a four-arm olfactometer demonstrated that the blend of released volatile compounds was attractive at a distance for males, but not for other females. The headspace of virgin females that were not previously fed with aphids was not attractive for either sex. GC-MS analyses revealed the presence of five compounds in the volatile blend: (–)-β-caryophyllene, β-elemene, methyl-eugenol, α-humulene and α-bulnesene. Subsequently, we have collected and quantified the constituents from the blend over a period of 9 days after exposure to aphids. All five compounds were produced exclusively after feeding virgin females with aphids, and their quantity significantly increased during the whole period of collection. (–)-β-caryophyllene was found to be the major constituent, representing between 80 and 86 % of the total blend. All these results could promote the development of more specific and efficient management methods to manipulate the movements of this invasive ladybeetle and to reduce its negative impacts on biodiversity. [less ▲]

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See detailSerratia symbiotica from Aphis fabae: a step forward in understanding the genomic evolution of a lifestyle transition from free-living to aphid-dependent
Grigorescu, Alina ULiege; Foray, Vincent; Sabri, Ahmed et al

Scientific conference (2013, October)

Detailed reference viewed: 63 (15 ULiège)