References of "Haubruge, Eric"
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See detailRole of long-chain hydrocarbons in the aggregation behaviour of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)
Durieux, Delphine ULg; Fischer, Christophe ULg; Brostaux, Yves ULg et al

in Journal of Insect Physiology (2012)

The multicoloured Asian ladybeetles, Harmonia axyridis (Pallas), form large aggregations inside dwellings to survive cold winters, causing annoyances to householders from their number and sometimes the ... [more ▼]

The multicoloured Asian ladybeetles, Harmonia axyridis (Pallas), form large aggregations inside dwellings to survive cold winters, causing annoyances to householders from their number and sometimes the induction of allergic reactions. Migratory flight and macrosite choice of this species is well documented. H. axyridis shows a hypsotactic behaviour and a clear preference for contrasting visual elements. However, how the microsite is selected remains undocumented, although a better understanding of the implicated factors could lead to the development of new control methods for this pest. In this work, we have hypothesized that non-volatile compounds are involved in the microsite choice and the aggregation process of this beetle. Long chain hydrocarbons were identified inside aggregation sites, comprising saturated and unsaturated homologues. An aggregation bioassay was then conducted on overwintering individuals, highlighting the retention capacity of the previously cited compounds on the tested ladybeetles. Additional investigations have shown that H. axyridis males and females, originating from overwintering sites, deposit a similar blend of molecules while walking. A Y-shaped tube assay revealed that this blend is used by male and female congeners as cue, allowing individuals to orientate towards the treated side of the olfactometer. These results suggest the use of two different blends of long chain hydrocarbons by H. axyridis during its aggregative period, the first one to lead conspecifics towards aggregation sites (microsites) and the second to ensure the cohesion of the aggregation. These findings support the potential use of these blends, in association with volatiles, in the design of traps in order to control infestations of this species in dwellings. [less ▲]

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See detailMicrosale interactions between earthworms and microorganisms, a review
Zirbes, Lara ULg; Thonart, Philippe ULg; Haubruge, Eric ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(1), 125-131

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See detailStudy of the factors involved in the aggregation of Harmonia axyridis Pallas (Coleoptera : Coccinellidae)
Durieux, Delphine ULg; Fischer, Christophe ULg; Deneubourg, Jean-Louis et al

in Communications in Agricultural and Applied Biological Sciences (2012), 77(1), 101-104

The aggregative behaviour of the multicoloured Asian ladybeetle, Harmonia axyridis Pallas, during winters, is still misunderstood. Our study was focused on the chemical and physical factors involved in ... [more ▼]

The aggregative behaviour of the multicoloured Asian ladybeetle, Harmonia axyridis Pallas, during winters, is still misunderstood. Our study was focused on the chemical and physical factors involved in the selection of its aggregation sites. Chemical and behavioural analyses highlighted that long-chain hydrocarbons lead congeners towards aggregations and ensure the cohesion of the cluster. On the other hand, we investigated the influence of (1) the density of individuals and (2) the quality of available shelters on H. axyridis decision to settle and aggregate under shelters. A binary choice experiment conducted in laboratory highlighted a permanent aggregative behaviour of H. axyridis, even during non-wintering conditions, and the existence of social interactions between individuals. [less ▲]

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See detailAphid alarm pheromone: An overview of current knowledge on biosynthesis and functions
Vandermoten, Sophie ULg; Mescher, Mark C.; Francis, Frédéric ULg et al

in Insect Biochemistry and Molecular Biology (2012), 42

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See detailL'entomologie forensique, les insectes résolvent les crimes
Frederickx, Christine ULg; Dekeirsschieter, Jessica ULg; Verheggen, François ULg et al

in Entomologie Faunistique = Faunistic Entomology (2011), 63(4), 237-249

L’entomologie forensique est une discipline des sciences forensiques qui étudie les insectes et d’autres arthropodes dans un contexte médico-légal. Pourtant, l’idée d’utiliser les insectes en ... [more ▼]

L’entomologie forensique est une discipline des sciences forensiques qui étudie les insectes et d’autres arthropodes dans un contexte médico-légal. Pourtant, l’idée d’utiliser les insectes en criminalistique n’est pas neuve, déjà en 1894 Mégnin nous parlait de la « faune des cadavres ». Depuis les années 2000, l’entomologie forensique connais un grand essor en Europe, notamment avec la création en 2002 de L’Association Européenne pour l’Entomologie Forensique (EAFE) qui regroupe l’ensemble des scientifiques spécialisés dans ce domaine. Actuellement, les insectes nécrophages ne sont plus exclusivement utilisés pour estimer la période écoulée entre le décès d’une victime et la découverte du corps ou intervalle post- mortem. Ils peuvent aussi apporter des informations dans les cas d’abus et de négligences chez les enfants ou les personnes âgées, sur les causes de la mort, l’identité des victimes, etc. Malgré ces progrès, cette discipline connait certaines lacunes, il y a très peu de données sur les Coléoptères nécrophages, sur la décomposition en milieu marin, des corps enterrés, etc. Cependant, de nouvelles techniques se mettent en place et permettent d’améliorer les méthodes entomologiques existantes. [less ▲]

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See detailLutte biologique contre le doryphore à l'aide de la chrysope
Sablon, Ludovic ULg; Vandereycken, Axel ULg; Haubruge, Eric ULg et al

Poster (2011, October 27)

Le doryphore est le plus important défoliateur de pommes de terre. Lors de ces dernières années, une réapparition, certainement liée à l’augmentation des températures sous nos latitudes, a été constatée ... [more ▼]

Le doryphore est le plus important défoliateur de pommes de terre. Lors de ces dernières années, une réapparition, certainement liée à l’augmentation des températures sous nos latitudes, a été constatée. Face aux futures restrictions européennes en matière d’insecticides ainsi qu’aux exigences du consommateur, des techniques de lutte plus « vertes » sont à développer. Lors de nos tests en laboratoire, l’utilisation de la larve de la chrysope a permis une réduction efficace des œufs et larves de doryphores. Cela permet donc d’entrevoir une lutte entomophage contre le doryphore via l’utilisation d’un prédateur naturel propre à nos régions. [less ▲]

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See detailLa coccinelle asiatique est-elle l'aphidiphage dominant dans les agro-écosystemes ?
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Conference (2011, October 26)

La coccinelle asiatique, Harmonia axyridis Pallas, importée en Europe de l'Ouest afin de lutter contre les pucerons et les cochenilles, s'y est rapidement acclimatée. Cette espèce exotique est devenue ... [more ▼]

La coccinelle asiatique, Harmonia axyridis Pallas, importée en Europe de l'Ouest afin de lutter contre les pucerons et les cochenilles, s'y est rapidement acclimatée. Cette espèce exotique est devenue invasive et exerce un impact négatif sur la biodiversité en entrant en prédation intraguilde avec les espèces natives. Afin d'évaluer l'importance de l'invasion de cette espèce exotique, un inventaire des prédateurs de pucerons a été réalisé en 2009 et 2010 au sein de quatre cultures : maïs, froment, pomme de terre et fève des marais, situées dans le Sud de la Belgique. Cinq espèces aphidiphages majoritaires ont été observées; par ordre décroissant d'importance: Episyrphus balteatus (De Geer), Chrysoperla carnea sensus lato (Stephens), Coccinella septempunctata (Linné), Harmonia axyridis Pallas et Propylea quatuordecimpunctata (Linné). La coccinelle asiatique ne représente que 8,7 % de tous les prédateurs de pucerons observés et 23,9% de toutes les coccinelles. De plus, elle est deux fois moins abondante que la coccinelle à sept points. Cette espèce invasive n'est donc actuellement pas l'aphidiphage le plus abondant dans les agro-écosystèmes wallons. [less ▲]

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See detailLes volatils racinaires de l’orge : un langage souterrain ?
Barsics, Fanny ULg; Gfeller, Aurélie ULg; Fauconnier, Marie-Laure ULg et al

Scientific conference (2011, October 13)

Cette présentation résume les avancées du projet Rhizovol après une année de travaux de recherche.

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See detailLes larves de taupins sont attirées par différentes sources de volatils racinaires
Barsics, Fanny ULg; Latine, Rémi ULg; Haubruge, Eric ULg et al

Poster (2011, October 13)

Grâce à des tests olfactométriques, nous voulons mettre en évidence la capacité de certains COVs d’origine racinaire à attirer ou repousser les larves de taupins. Nous montrons ici les premiers résultats ... [more ▼]

Grâce à des tests olfactométriques, nous voulons mettre en évidence la capacité de certains COVs d’origine racinaire à attirer ou repousser les larves de taupins. Nous montrons ici les premiers résultats obtenus grâce à des olfactomètres tubulaires, soit l’attraction par des COVs issus de racines hachées et l’attraction par le 2-pentylfuran, volatil contenu dans les racines d’orge. [less ▲]

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See detailLe taupin : un ravageur souterrain préoccupant
Barsics, Fanny ULg; Haubruge, Eric ULg; Verheggen, François ULg

Poster (2011, October 13)

Les larves de taupin représentent une menace pour un grand nombre de cultures céréalières et légumières. Elles s’attaquent aux racines, aux radicelles, aux tubercules, aux graines en germination et ... [more ▼]

Les larves de taupin représentent une menace pour un grand nombre de cultures céréalières et légumières. Elles s’attaquent aux racines, aux radicelles, aux tubercules, aux graines en germination et peuvent percer de part en part le collet, entraînant ainsi de graves lésions voire la mort des plants attaqués. Nous présentons ici ces insectes, les techniques de lutte actuellement envisageables, ainsi que notre approche de l’étude de ces insectes dans le but de mieux envisager la lutte intégrée à leur encontre. [less ▲]

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See detailChanges in termites feeding diets for gut micro-organisms selection and further cultivation
Bauwens, Julien ULg; Brasseur, Catherine ULg; Matteotti, Christel ULg et al

Poster (2011, October 02)

Termites gut may overcome important dietary perturbations, initial diversity acting as key point buffering effects on host, although termites possess their own enzymatic system. Some artificial diets ... [more ▼]

Termites gut may overcome important dietary perturbations, initial diversity acting as key point buffering effects on host, although termites possess their own enzymatic system. Some artificial diets permitted a simplification of the lower termites gut symbiotic system, which could be used as first step in symbionts isolation and cultivation. Preliminary assay of cultivation actually gave encouraging results. Proteomic proved to be suitable tool to investigate such a complex system. Nevertheless, for some symbionts very few genes are sequenced, which should lead to more targeted proteomic studies. Protein chromatography will allow to split up the proteome and more accurate analysis. [less ▲]

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See detailAnt-aphid mutualism - A question of microorganisms?
Fischer, Christophe ULg; Patris, Geoffrey; Duriaux, Adrien ULg et al

Poster (2011, September)

It is now long known that some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection ... [more ▼]

It is now long known that some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection. From a behavioral point of view, this phenomenon has been well studied, but its chemistry and semiochemical mechanisms are still largely unknown. This study aims to identify semiochemicals involved in the establishment of this relation and their sources, using both chemical and behavioral methods. Bioassays revealed that the greatest part of ant attraction toward aphid colonies is due to honeydew volatile compounds; enabling ant scouts to find more quickly aphid colonies and distantly recognize myrmecophilous species. Many of those VOCs seeming to have microbial origins, the main honeydew microorganisms have been isolated and their roles in VOCs production and ant attraction have been investigated. [less ▲]

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See detailThe use of semiochemical slow-release devices in integrated pest management strategies
Heuskin, Stéphanie ULg; Verheggen, François ULg; Haubruge, Eric ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(3), 459-470

The development of integrated pest management (IPM) strategies is increasing since many problems appeared with the use of synthetic pesticides. Semiochemicals – informative molecules used in insect-insect ... [more ▼]

The development of integrated pest management (IPM) strategies is increasing since many problems appeared with the use of synthetic pesticides. Semiochemicals – informative molecules used in insect-insect or plant-insect interaction – are more and more considered within IPM strategies as alternative or complementary approach to insecticide treatments. Indeed, these species-specific compounds do not present any related adversely affectation of beneficial organisms and do not generate any risk of pest insect resistance as observed with insecticides. Because of their complex biological activity, their dispersion in the environment to be protected or monitored needs the elaboration of slow-release devices ensuring a controlled release of the biologically active volatile compounds. These sensitive molecules also need to be protected from degradation by UV light and oxygen. Many studies were conducted on estimation of release-rate from commercialized or experimental slow-release devices. The influence of climatic parameters and dispenser type were estimated by previous authors in order to provide indications about the on-field longevity of lures. The present review outlines a list of slow-release studies conducted by many authors followed by a critical analysis of these studies. [less ▲]

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See detailBiosensors in Forensic Sciences
Frederickx, Christine ULg; Verheggen, François ULg; Haubruge, Eric ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(3), 449-458

A biosensor is a device that uses biological materials to monitor the presence of specific chemicals in an area. Traditional methods of volatile detection used by the law enforcement agencies and rescue ... [more ▼]

A biosensor is a device that uses biological materials to monitor the presence of specific chemicals in an area. Traditional methods of volatile detection used by the law enforcement agencies and rescue teams consist in the canine olfaction. This concept of using dogs to detect specific substances is quite old. However, dogs have some limitations such as cost of training, time of conditioning. Thus, the possibility of using other organisms as biosensors including rats, dolphins, honeybees, parasitic wasps in detection of explosives, narcotics and cadavers has been developed. But, insects have several advantages unshared by mammalians. Insects are very sensitive, cheap to produce and can be conditioned with impressive speed for a specific chemical-detection task. Moreover, insects might be a preferred sensing method in scenarios that are deemed too dangerous to use mammalian. The purpose of this review is to provide an overview of the biosensors used in forensic sciences [less ▲]

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See detailUse of Chrysoperla carnea larvae for biological control of immature stages of Leptinotarsa decemlineata
Sablon, Ludovic ULg; Lejeune, Renaud ULg; Haubruge, Eric ULg et al

Poster (2011, August 13)

The Colorado potato beetle (CPB), Leptinotarsa decemlineata Say, is an important economic pest of potato which populations are effectively controlled by insecticides. However, development of resistance ... [more ▼]

The Colorado potato beetle (CPB), Leptinotarsa decemlineata Say, is an important economic pest of potato which populations are effectively controlled by insecticides. However, development of resistance along with the poor image of unnaturally management methods pushes researchers to develop alternative "greener" methods. Chrysoperla carnea is a generalist predator whose larvae are very voracious on any types of soft-bodied insects. In laboratory assays, we demonstrated a good predatory potential of lacewing larvae against eggs, first and second CPB larval instars. The third lacewing larval instar showed an important consumption of CPB immature stages. Indeed, when looking at the daily consumption, we found that prey consumption by the third larval instar was 3-fold higher compared to the two first instars. Partial or total consumption of prey was also numbered. Different proportions of partial/total consumption were found and these depend on the lacewing larval stage. This study provides new perspectives for possible use of C. carnea as a biological agent to control CPB. Nevertheless, additional work has to be conducted under semi-natural and field to completely evaluate the lacewing potential as a CPB predator. [less ▲]

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See detailAttraction of wireworms towards root-emitted volatile organic compounds of barley
Barsics, Fanny ULg; Latine, Rémi ULg; Haubruge, Eric ULg et al

Poster (2011, August)

Wireworms (Coleoptera: Elateridae) are soil dwelling pests of many crops. Aldrin and lindane used to provide satisfactory treatment levels of infested lands. Their withdrawal from the market for ... [more ▼]

Wireworms (Coleoptera: Elateridae) are soil dwelling pests of many crops. Aldrin and lindane used to provide satisfactory treatment levels of infested lands. Their withdrawal from the market for environmental issues gave birth to new needs in terms of management. In order to enhance integrated management of this pest, we work on the chemical ecology of Agriotes sordidus Illiger. We focus on its interaction with barley roots, mediated by volatile organic compounds (VOCs). Our experimentations are based on behavioural responses of wireworms in olfactometric devices and their statistical relevance [less ▲]

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