References of "Verheggen, François"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailOccurrence of aphid predators in Belgian agro-ecosystems
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Poster (2011, March 06)

Detailed reference viewed: 18 (4 ULg)
See detailMicroorganisms from aphids attract hoverflies and enhance their efficacy
Leroy, Pascal ULg; Sabri, Ahmed ULg; Heuskin, Stéphanie ULg et al

Poster (2011, March 05)

Aphids are some of the most serious pests of crops worldwide, causing major yield and economic losses. They damage plants by feeding on the phloem sap, excreting copious amounts of honeydew and, in some ... [more ▼]

Aphids are some of the most serious pests of crops worldwide, causing major yield and economic losses. They damage plants by feeding on the phloem sap, excreting copious amounts of honeydew and, in some cases, vectoring plant diseases. Here, we report the first isolation of a bacterium from the pea aphid Acyrthosiphon pisum honeydew, Staphylococcus sciuri, which is involved in the release of semiochemicals acting as a kairomone for aphid natural enemies. These semiochemicals were identified by Solid-Phase Microextraction (SPME) and Gas Chromatography-Mass Spectrometry (GC-MS). Our results show that this bacterium plays a key role in the interactions between aphids and natural enemies because it is the direct source of volatiles used by the aphidophagous hoverfly Episyrphus balteatus (De Geer) (Diptera: Syrphidae) to locate its aphid prey. Through wind-tunnel experiments, some specific semiochemicals produced by S. sciuri were identified as significant attractants and ovipositional stimulants. Also, assays under greenhouses and in potato fields have demonstrated that a culture medium containing the bacterium S. sciuri strongly attracts and induces the oviposition of hoverflies, enhancing their efficiency as biological control agents. The use of this no pathogenic bacterium could provide a very novel approach towards enhancing the efficacy of biological control agents to control aphids in field crops and greenhouse systems. [less ▲]

Detailed reference viewed: 105 (5 ULg)
Full Text
Peer Reviewed
See detailAphid-host plant interactions: Does aphid honeydew exactly reflect the host plant amino acid composition?
Leroy, Pascal ULg; Wathelet, Bernard ULg; Sabri, Ahmed ULg et al

in Arthropod-Plant Interactions (2011), 5

Plants provide aphids with unbalanced and low concentrations of amino acids. Likely, intracellular symbionts improve the aphid nutrition by participating to the synthesis of essential amino acids. To ... [more ▼]

Plants provide aphids with unbalanced and low concentrations of amino acids. Likely, intracellular symbionts improve the aphid nutrition by participating to the synthesis of essential amino acids. To compare the aphid amino acid uptakes from the host plant and the aphids amino acid excretion into the honeydew, host plant exudates (phloem + xylem) from infested and uninfested Vicia faba L. plants were compared to the honeydew produced by two aphid species (Acyrthosiphon pisum Harris and Megoura viciae Buckton) feeding on V. faba. Our results show that an aphid infestation modifies the amino acid composition of the infested broad bean plant since the global concentration of amino acids significantly increased into the host plant in response to aphid infestations. Specifically, the concentrations of two amino acids glutamine and asparagine were strongly enhanced. The amino acid profiles from honeydews were similar for the two aphid species, but the concentrations found into the honeydews were generally lower than those measured in the exudates of infested plants (aphids uptakes). This work also highlights that aphids take large amounts of amino acids into the host plant, especially glutamine and asparagine which are converted into glutamic and aspartic acids but also into other essential amino acids. The amino acid profiles differed between the host plant exudates and the aphid excretion product. Finally, this study highlights that the pea aphid - a “specialist” for the V. faba host plant - induced more important modifications into the host plant amino acid composition than the “generalist” aphid M. viciae. [less ▲]

Detailed reference viewed: 38 (9 ULg)
Full Text
Peer Reviewed
See detailLa coccinelle asiatique est-elle l'aphidiphage dominant dans les agro-écosystèmes ?
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

in 9ème Conférence Internationale sur les Ravageurs en Agriculture, Montpellier 26-27 octobre 2011 (2011)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), has been introduced in Western Europe to control aphid and coccid populations in greenhouses. This exotic species rapidly adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), has been introduced in Western Europe to control aphid and coccid populations in greenhouses. This exotic species rapidly adapted to temperate climatic conditions and invaded all Europe in few years. Now, H. axyridis is causing damages to the ecosystems through e.g. intraguild predation (IGP) with native species. We evaluated, in 2009 and 2010, the occurrence of aphid natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystems (corn, wheat, potato, broad bean) in northern Wallonia (Belgium). Five dominating aphidophagous species were observed, in decreasing order of importance: Episyrphus balteatus (De Geer), Chrysoperla carnea sensus lato (Stephens), Coccinella septempunctata (Linné), Harmonia axyridis and Propylea quatuordecimpunctata (Linné). The Multicolored Asian ladybird represents 8,7% of all observed aphidophagous species and 23,9% of coccinellids. Moreover, H. axyridis occurrence is two-times less important than C. 7-punctata. These results highlight that this invasive species is currently not the most abundant in southern Belgium agro-ecosystems and would not influence other aphid predators in those particular ecosystems. [less ▲]

Detailed reference viewed: 81 (15 ULg)
Full Text
Peer Reviewed
See detailEarthworms smell microorganisms in soil
Zirbes, Lara ULg; Verheggen, François ULg; Mescher, Mark et al

Poster (2011)

Detailed reference viewed: 29 (2 ULg)
Full Text
Peer Reviewed
See detailLes phéromones d'alarme dans le règne animal
Verheggen, François ULg; Haubruge, Eric ULg

in Entomologie Faunistique = Faunistic Entomology (2011), 63(4), 259-274

Many animals respond to predation by releasing alarm signals that warn other individuals of the presence of danger in order to reduce the success of predators. While alarm signals may be visual or ... [more ▼]

Many animals respond to predation by releasing alarm signals that warn other individuals of the presence of danger in order to reduce the success of predators. While alarm signals may be visual or auditory as well as chemical, alarm pheromones are common, especially among insects and aquatic organisms. In this paper we discuss our current understanding of chemical alarm signaling in a variety of animal groups (including social and pre-social insects, marine invertebrates, fish, and mammals). We also briefly discuss the exploitation of alarm pheromones as foraging cues for natural enemies. [less ▲]

Detailed reference viewed: 35 (6 ULg)
Full Text
Peer Reviewed
See detailInsecticidal effect of Jatropha curcas oil on the aphid Aphis fabae (Hemiptera: Aphididae) and on the main insect pests associated with cowpeas (Vigna unguiculata) in Niger
Abdoul Habou, Zakari; Haougui, A.; Mergeai, Guy ULg et al

in Tropicultura (2011), 29(4), 225-229

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as ... [more ▼]

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as part of an efficacy test conducted in the laboratory. During a second stage, the insecticidal efficacy of 5 and 7.5% oil concentrations was evaluated on the main pests infesting cowpea crops (Vigna unguiculata L.) as part of a field test conducted at the University of Niamey (Niger). The results obtained in the two tests demonstrate the biocidal effect of the treatments applied, which increases with the concentration. On the black bean aphid, the biocidal effect increases during the hours following the application of oil before reaching a peak after 4 days. On cowpeas, J. curcas oil concentrations of 5% and 7.5% make it possible to reduce the level of attack by aphids (Aphis craccivora) by 10 and 50% respectively compared to the control. A 50% and 75% fall in the number of thrips (Megalurothrips sjöstedti) and bugs (Anoplocnemis curvipes), respectively, can be observed under the same conditions. This treatment made it possible to greatly increase yields compared to the untreated control. [less ▲]

Detailed reference viewed: 115 (6 ULg)
Full Text
Peer Reviewed
See detailRecensement des Silphidae dans les collections d'étudiants de Gembloux Agro-Bio Tech sur la période 2001-2010
Dekeirsschieter, Jessica ULg; Verheggen, François ULg; Bonnet, Stéphanie ULg et al

in Faunistic Entomology - Entomologie Faunistique (2011), 64(1), 15-21

Les Silphidae capturés par les étudiants de Gembloux Agro-Bio Tech (Université de Liège) durant la période 2001-2010 se répartissent entre treize espèces de Silphinae et de Nicrophorinae. Cinq espèces de ... [more ▼]

Les Silphidae capturés par les étudiants de Gembloux Agro-Bio Tech (Université de Liège) durant la période 2001-2010 se répartissent entre treize espèces de Silphinae et de Nicrophorinae. Cinq espèces de Nicrophorinae ont été recensées: Nicrophorus vespillo L. 1758, Nicrophorus vespilloides Herbst 1783, Nicrophorus interruptus Stephens 1830, Nicrophorus investigator Zetterstedt 1824, et Nicrophorus humator Gleditsch 1767. Concernant les Silphinae, on a recensé huit espèces: Oiceoptoma thoracicum L. 1758, Dendroxena quadrimaculata Scopoli 1772, Necrodes littoralis L. 1758, Ablattaria laevigata laevigata F. 1775, Thanatophilus sinuatus F. 1775, Silpha carinata Herbst 1783, Silpha tristis Illiger 1798 et Phosphuga atrata atrata L. 1758. L’espèce de Silphinae la plus représentée parmi les collections d’étudiants est P. atrata atrata suivie d’O. thoracicum. Parmi les Nicrophorus spp., N. vespilloides, N. humator et N. vespillo sont les espèces plus représentées. [less ▲]

Detailed reference viewed: 42 (10 ULg)
See detailThe chemical ecology of Harmonia axyridis
Sloggett, John; Magro, Alexandra; Verheggen, François ULg et al

in Roy, Helen; Ware, Remy; Handley-Lawson, Lori (Eds.) et al Invasive arthropod predators and parasitoids: an ecological approach (2011)

We review the chemical ecology of the ladybird beetle Harmonia axyridis from the perspective of its invasiveness and the deleterious effects it exerts in the regions it has colonised. We outline the ... [more ▼]

We review the chemical ecology of the ladybird beetle Harmonia axyridis from the perspective of its invasiveness and the deleterious effects it exerts in the regions it has colonised. We outline the nature and quantification of its chemical defence, and discuss the protection this provides from natural enemies, particularly intraguild predators. We consider the role played by infochemicals in location of prey, intraspecific communication and intraguild interactions; we also discuss the role of prey allelochemicals in relation to H. axyridis extreme dietary generalism. Harmonia axyridis poses a number of practical problems for human health and well-being, including “lady beetle taint” wine contamination and problems consequent on large aggregations overwintering in buildings. We discuss chemical insights into these issues and, in particular, how attractants and repellents might help manage H. axyridis populations. We conclude by discussing future perspectives for research. [less ▲]

Detailed reference viewed: 82 (19 ULg)
Full Text
Peer Reviewed
See detailDoes Tribolium brevicornis cuticular chemistry deter cannibalism and predation of pupae?
Alabi, Taoffic; Dean, Jennifer; Michaud, Jean-Pierre et al

in Journal of Insect Science [=JIS] (2011), 11

The cuticular hydrocarbons of insects are species-specific and often function as semiochemicals. The activity of Tribolium brevicornis cuticular hydrocarbons as feeding deterrents that ostensibly function ... [more ▼]

The cuticular hydrocarbons of insects are species-specific and often function as semiochemicals. The activity of Tribolium brevicornis cuticular hydrocarbons as feeding deterrents that ostensibly function to prevent pupal cannibalism and predation was evaluated. The cuticular hydrocarbons of T. brevicornis pupae were characterized and flour disk bioassays conducted with individual and combined extract components incorporated into artificial diets on which Tribolium adults fed for six days. Feeding by T. brevicornis and T. castaneum on flour disks containing cuticular extracts of T. brevicornis pupae resulted in reduced consumption and weight loss relative to feeding on control flour disks. In both cases, feeding deterrence indices exceeded 80% suggesting that T. brevicornis cuticular hydrocarbons could function to deter cannibalism and predation of pupae by larvae and adult beetles. Sixteen different cuticular hydrocarbons were identified in T. brevicornis pupal extracts. Eight of the commercially available linear alkanes were tested individually in feeding trials with eight Tribolium species. One compound (C28) significantly reduced the amount of food consumed by three species compared to control disks, whereas the compounds C25, C26, and C27elicited increased feeding in some species. Four other compounds had no effect on consumption for any species. When four hydrocarbon mixtures were tested for synergistic deterrence on T. brevicornis and T. castaneum, none significantly influenced consumption. Our results indicate that the cuticular chemistry of T. brevicornis pupae could serve to deter predation by conspecific and congeneric beetles. [less ▲]

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailLarge carrion beetles (Coleoptera, Silphidae) in Western Europe: a review
Dekeirsschieter, Jessica ULg; Verheggen, François ULg; Lognay, Georges ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(3), 425-437

This review focuses on carrion beetles (Coleoptera, Silphidae) of the Western Palearctic and their potential use in forensic entomology as bioindicators. Few studies have looked at Silphidae in forensic ... [more ▼]

This review focuses on carrion beetles (Coleoptera, Silphidae) of the Western Palearctic and their potential use in forensic entomology as bioindicators. Few studies have looked at Silphidae in forensic context and investigations. However, some Silphidae present the desirable characteristics of some Diptera used in postmortem estimates and thus may extend the minimum postmortem interval (PMImin). We review here the taxonomy and distribution of Western Palearctic Silphidae. The anatomical and morphological characteristics of both subfamilies are described for adults and larvae. The biology and ecology of silphids are also summarized for Silphinae and Nicrophorinae. A specific chapter gives an overview of the current uses of Silphidae in forensic entomology as postmortem indicator. [less ▲]

Detailed reference viewed: 270 (24 ULg)
Full Text
Peer Reviewed
See detailAge-dependent attractivity of males’ sexual pheromones in Bombus terrestris (L.) [Hymenoptera, Apidae]
Coppée, Audrey; Mathy, Tifany; Cammaerts, Marie-Claire et al

in Chemoecology (2011)

Males of Bombus terrestris (L.) adopt a patrolling behaviour during their nuptial parade using cephalic labial gland (CLG) secretions containing sexual pheromones to attract conspecific virgin queens. The ... [more ▼]

Males of Bombus terrestris (L.) adopt a patrolling behaviour during their nuptial parade using cephalic labial gland (CLG) secretions containing sexual pheromones to attract conspecific virgin queens. The changes in chemical composition of their CLG secretions with age are quite well known. In this study, we investigate the evolution of CLG secretions with age in greater detail and compare behavioural reactions of conspecific virgin queens to the secretions. We show that compounds of CLG secretions follow two profiles. Most of the compounds increase from the first day after emergence until the bees are 15-days-old and then decrease. Others are less abundant in 1 to 15-day-old males and then increase (e.g. tricosane, tricosene, henicosane, tetradecanoic acid, pentacosene, pentacosane, heptacosene, heptacosane, nonacosene and geranylcitronellyl tetradecanoate). Differences in secretion composition lead to preferences of virgin queens for males according to the male’s age. Virgin queens prefer the pheromonal gland secretions of bees of the following ages in decreasing order; 1 day = 3 days\7 days =30 days\15 days\10 days. The virgin queens are strongly attracted by secretions containing high amounts of 2,3-dihydrofarnesol, 2,3-dihydrofarnesal, ethyl dodecanoate and hexadecanol. On the contrary, geranylcitronellol is more abundant in 30-day-old males. [less ▲]

Detailed reference viewed: 45 (6 ULg)
Full Text
Peer Reviewed
See detailOccurrence de la coccinelle asiatique (Harmonia axyridis Pallas), espèce invasive, dans les agro-habitats en 2009
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

in Entomologie Faunistique = Faunistic Entomology (2010), 63(4), 251-258

La lutte contre les pucerons de manière biologique consiste entre autre à utiliser des insectes prédateurs de pucerons tels que les coccinelles. En Belgique un des auxiliaires le plus utilisé est la ... [more ▼]

La lutte contre les pucerons de manière biologique consiste entre autre à utiliser des insectes prédateurs de pucerons tels que les coccinelles. En Belgique un des auxiliaires le plus utilisé est la coccinelle à deux points (Adalia bipunctata) mais en 1997, les horticulteurs ont introduit la coccinelle asiatique (Harmonia axyridis) afin de lutter plus efficacement contre les pucerons. Cette coccinelle invasive s'est rapidement répandue dans toute la Belgique et à travers l'Europe. Afin d'évaluer son impact sur l'entomofaune des milieux agricoles, nous avons réalisé un inventaire des aphidiphages présent sur 10 sites réparti en Wallonie. Deux méthodes d'échantillonnage ont été utilisées: (1) l'utilisation de pièges collant et (2) l'observation visuelle dans des quadras d'1m². Après 10 semaines d'inventaire, nous pouvons conclure que pour l'année 2009, la coccinelle asiatique est la coccinelle la plus abondante dans les agro-écosystèmes wallons. Les cultures préférentielles dans lesquelles la coccinelle invasive a été la plus abondante sont la pomme de terre biologique et le maïs. Culture où la quantité de puceron n'est pas forcement la plus élevée. La période de reproduction de la coccinelle asiatique se situe à la mi-juillet, période d'abondance de proies dans les cultures étudiées. [less ▲]

Detailed reference viewed: 113 (8 ULg)