References of "Verheggen, François"
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See detailInsecticidal effect of Jatropha curcas L. seed oil on Callosobruchus maculatus Fab and Bruchidius atrolineatus Pic (Coleoptera: Bruchidae) on stored cowpea seeds (Vigna unguiculata L. Walp.) in Niger
Abdoul Habou, Zakari; Haougui, Adamou; Basso, Adamou et al

in African Journal of Agricultural Research (2014), 9(32), 2506-2510

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See detailAVIS de l’Agence nationale de sécurité sanitaire de l’alimentation, de l’environnement et du travail relatif à « l’analyse de risques phytosanitaires portant sur Rhagoletis completa »
Verheggen, François ULg; Escobar, Abraham; Giordanengo, Philippe et al

Report (2014)

Rhagoletis completa est un insecte (Diptera : Tephritidae) nuisible listé à l’annexe I, partie A, chapitre I de la directive 2000/29/CE. À ce titre, cet organisme nuisible est également listé en annexe B ... [more ▼]

Rhagoletis completa est un insecte (Diptera : Tephritidae) nuisible listé à l’annexe I, partie A, chapitre I de la directive 2000/29/CE. À ce titre, cet organisme nuisible est également listé en annexe B de l’arrêté du 31 juillet 2000, ce qui en fait un organisme de lutte obligatoire sous certaines conditions sur tout le territoire français. En France métropolitaine, cet organisme nuisible est très largement répandu dans le bassin de production du grand sud-est où la stratégie de lutte mise en place visait à limiter sa pression. Il est également présent dans le bassin de production du grand sud-ouest (Aquitaine et Midi- Pyrénées), bien que le coeur de ce bassin de production de noix semble encore préservé. La stratégie mise en place dans cette région vise encore à limiter son extension et à protéger les zones encore exemptes. Au vu de la dispersion de R. completa dans le grand sud-est, l’Anses est saisie pour la réalisation d’une analyse de risques phytosanitaires (ARP) portant sur R. completa et ce, sur l’ensemble du territoire de l’Union Européenne. Cette ARP pourra servir de base aux discussions communautaires permettant la révision du statut de cet organisme au sein de la directive 2000/29/CE ainsi que la définition de mesures de gestion appropriées le cas échéant dans le cadre du dispositif passeport phytosanitaire européen (PPE). [less ▲]

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See detailInsects Associated With Jatropha curcas Linn. (Euphorbiaceae) in West Niger
Zakari, Abdoul Habou; Toudou, Adam; Haubruge, Eric ULg et al

in Journal of Insect Science [=JIS] (2014)

Jatropha curcas has been introduced into Niger since 2004 by International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). This plant is cultivated for its oil, which can be used as a ... [more ▼]

Jatropha curcas has been introduced into Niger since 2004 by International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). This plant is cultivated for its oil, which can be used as a Biofuel. Through direct and indirect insect collection methods, an inventory of the insect associated with J. curcas has been conducted in Western Niger during two rainy seasons (from June to October) in 2010 and 2011. We have identified insects belonging to the following families: Acrididae (Oedaleus senegalensis Krauss, 15 Oedaleus nigeriensis Uvarov, Heteracris leani Uvarov, Catantops stramineus Walker, Parga cyanoptera Uvarov, and Acanthacris ruficornis citrina Audinet-Serville), Pyrgomorphidae (Poekilocerus bufonius hieroglyphicus Klug), Cetoniidae (Pachnoda interrupta Olivier, Pachnoda marginata aurantia Herbst, Pachnoda sinuata Heinrich and McClain, and Rhabdotis sobrina Gory and Percheron), Meloidae (Decapotoma lunata Pallas), Pentatomidae (Agonoscelis versicoloratus Dallas, Nezara viridula Linn, and Antestia sp. Kirkaldy), Coreidae (Leptoglossus membranaceus Fabricius and Cletus trigonus Thunberg), and Scutelleridae (Calidea panaethiopica Kirkaldy). Origin and 20 potential impact on J. curcas of all these insect species are presented and discussed. The lower insect’s diversity indexes are observed in 2010 and 2011 for Niamey, Saga, and Gaya because of semi-arid character of the Sahelian area. [less ▲]

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See detailAphid honeydew: An arrestant and a contact kairomone for Episyrphus balteatus (Diptera: Syrphidae) larvae and adults
Leroy, Pascal; Almohamad, Raki; Attia, Sabrine et al

in European Journal of Entomology (2014), 111(2), 237-242

Predator searching efficiency increases in response to a variety of environmental cues associated with its prey. The sugary excretion of aphids (honeydew) has been found to act as a prey-associated cue ... [more ▼]

Predator searching efficiency increases in response to a variety of environmental cues associated with its prey. The sugary excretion of aphids (honeydew) has been found to act as a prey-associated cue for many aphid natural enemies. In the present study, the honeydew excreted by Acyrthosiphon pisum (Harris) was identified as an arrestant and a contact kairomone for young larvae and adults of a common predatory hoverfly, Episyrphus balteatus (De Geer) (Diptera: Syrphidae). First and second instar larvae increased their foraging behaviour in the honeydew-treated area. When plants were sprayed with crude honeydew, the speed of movement of female E. balteatus was significantly higher than in controls, resulting in a longer period of time spent on treated plants and laying eggs. We conclude that the honeydew excreted by A. pisum induces searching behaviour and acts as and arrestant not only for adults but also for young E. balteatus larvae. [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 ULg; 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 detailÉvaluation du potentiel de dix accessions de Jatropha curcas L. (Euphorbiaceae) au Niger
Abdoul Habou, Zakari; Katkore, Boubacar; Abasse, Tougiani et al

in Journal of Applied Biosciences (2014), 77

Objective: A trial of the ten accessions for J curcas was carried out at regional Agricultural Research Center of Maradi in Niger, with aim to evaluate the performance of Jatropha curcas accessions ... [more ▼]

Objective: A trial of the ten accessions for J curcas was carried out at regional Agricultural Research Center of Maradi in Niger, with aim to evaluate the performance of Jatropha curcas accessions. Methodology and results: Each accession was represented by two rows and each row has 15 plant trees of J. curcas. Data on the rate of survival and growth parameters of each tree were collected. Results revealed that there is no significant difference between accessions tested for height and diameter. Accessions Katil 13 and GB 14 respectively originated from Mali and Bisseau Guinea were best adapted for the Niger conditions. The yield value of 511 and 445 kg per hectare respectively obtained from Katil 13 and GB 14 in 2012.Conclusion and application of results: The Government of Niger has drawn attention to this crop and has launched a J. curcas plantation for seed production of 150 ha at Guessalbodi. National Research Institution. NGOs are also involved in J. curcas plantation for biofuel use. [less ▲]

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See detailDepths and type of substrate influence the ability of Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) to encounter host
Frederickx, Christine ULg; Dekeirsschieter, Jessica ULg; Verheggen, François ULg et al

in Journal of Insect Science [=JIS] (2014)

The foraging behaviour of a parasitoid insect species includes the host’s habitat and subsequent location of the host. Habitats-substrate, substrate moisture and light levels can affect the host location ... [more ▼]

The foraging behaviour of a parasitoid insect species includes the host’s habitat and subsequent location of the host. Habitats-substrate, substrate moisture and light levels can affect the host location made by different species of parasitoids. However, the depth at which parasitoids concentrate their search effort is an another important ecological characteristic and play an important role on the host location. Here, we have investigated the ability of a pupal parasitoid, Nasonia vitripennis Walker, to penetrate and kill fly pupae located at different depth of the substrate. Three different types of substrate were tested: loam soil, compost and vermiculite substrate. In both loam soil and compost, all of the parasitism activity was restricted to pupae placed directly on the surface. Parasitism activity in vermiculite showed that the average number of pupae parasitized was decreased with depth. These results suggest that fly pupae situated deeper in the substrate are less subjected to parasitism by N. vitripennis. [less ▲]

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See detailDevelopment of new strategies against the tomato leafminer, Tuta absoluta Meyrick
De Backer, Lara ULg; Francis, Frédéric ULg; Verheggen, François ULg

Conference given outside the academic context (2014)

The tomato leafminer, Tuta absoluta (Meyrick), is a Lepidoptera considered as one of the major pest of Solanaceae. It causes important yield loss in South America, where it is originated, and in the West ... [more ▼]

The tomato leafminer, Tuta absoluta (Meyrick), is a Lepidoptera considered as one of the major pest of Solanaceae. It causes important yield loss in South America, where it is originated, and in the West Palearctic region, where it was introduced in 2006. Insecticide applications and the use of the sexual pheromone have been the main control method used against T. absoluta. Insecticides are inefficient because of the endophytic habit of larvae, which are protected in the leaf mesophyll or inside fruits. Moreover, resistances against various insecticides have been reported. The sexual pheromone based strategies also provide poor results. One explanation has been recently provided by the demonstration of a parthenogenetic reproduction in T. absoluta, from the research group in Gembloux Agro-Bio Tech (ULg). Because there is a real need to improve crop protection against T. absoluta and in the meanwhile reducing the use of synthetic insecticidal compounds, researches aim at providing new perspectives to further biocontrol strategies against T. absoluta. [less ▲]

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See detailHost-habitat location by the parasitoid, Nasonia vitripennis Walker (Hymenoptera: Pteromalidae).
Frederickx, Christine ULg; Dekeirsschieter, Jessica ULg; Verheggen, François ULg et al

in Journal of Forensic Sciences (2014), 59

This study investigated the role of odorant cues used during host-habitat location by the generalist parasitoid, Nasonia vitripennis Walker. N vitripennis is a common parasitoid of Dipteran pupae found in ... [more ▼]

This study investigated the role of odorant cues used during host-habitat location by the generalist parasitoid, Nasonia vitripennis Walker. N vitripennis is a common parasitoid of Dipteran pupae found in association with decaying carrion. Behavioral assays were used to investigate the host-habitat searching behavior under different scenarios. First, we demonstrated N. vitripennis to be significantly attracted toward odorant cues associated with decaying meat. The biological activity of nine of the volatile molecules constituting the odor of decaying meat were tested on the searching behavior of parasitoid females through two complementary chemoecological approaches: electronantennography (EAG) and olfactometry bioassays. Butanoic acid and butan-1-ol elicited high olfactory responses, but no attraction was induced by these two chemicals. Behavioral assays showed that, among the VOCs tested, methyldisulfanylmethane (DMDS) was the only volatile chemical to induce attraction in N. vitripennis. [less ▲]

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See detailUn regard nouveau sur le mutualisme fourmis-pucerons
Verheggen, François ULg

Scientific conference (2014)

Un regard nouveau sur le mutualisme fourmis-pucerons Nombre d’homoptères producteurs de miellat ont développé des relations de mutualisme avec les fourmis. Depuis des décennies, le cas particulier des ... [more ▼]

Un regard nouveau sur le mutualisme fourmis-pucerons Nombre d’homoptères producteurs de miellat ont développé des relations de mutualisme avec les fourmis. Depuis des décennies, le cas particulier des fourmis et des pucerons est l'un des modèles de mutualisme les plus étudiés, et a captivé des générations d’entomologistes. Sans défense, les pucerons sont des proies faciles pour de nombreux ennemis naturels. Cependant, certaines espèces (dites myrmécophiles) sont observées associés à des fourmis, qui protègent leurs partenaires en échange de leur miellat, riche en sucres et acides aminés. Sédentarisme, absence de réaction agressive, omniprésence et habitudes grégaires, tous ces facteurs contribuent à faciliter leur découverte et leur contrôle par les fourmis. Mais la rencontre entre ces deux partenaires est facilitée par un troisième groupe d’organismes: des bactéries. Se développant dans le miellat, ces dernières guident, par les odeurs qu’elles produisent, les fourmis exploratrices vers la colonie de pucerons. Dans cette conférence nous présenterons les résultats de plusieurs années de recherche démontrant l’importance : (1) du rôle de protection des fourmis, (2) de la composition en sucre du miellat, (3) des phéromones aphidiennes et (4) des bactéries se développant dans le miellat, pour l’établissement et le maintien des relations de mutualisme entre fourmis et pucerons. [less ▲]

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

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

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See detailAssociative learning of Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) to methyldisulfanylmethane
Frederickx, Christine ULg; Verheggen, François ULg; Brostaux, Yves ULg et al

in Journal of Forensic Sciences (2014)

Traditional methods of volatile detection used by police typically consist of reliance on canine olfaction. However, dogs have some limitations such as cost of training and time of conditioning. The ... [more ▼]

Traditional methods of volatile detection used by police typically consist of reliance on canine olfaction. However, dogs have some limitations such as cost of training and time of conditioning. The possibility of using parasitic wasps for detecting explosives and narcotics has been developed. Moreover, wasps are cheap to produce and can be conditioned with impressive speed for a specific chemical-detection task. We examined the ability of Nasonia vitripennis Walker to learn and respond to methydisulfanylmethane (DMDS), a volatile discriminator of cadaver. The training aimed to form an association between an unconditioned stimulus (pupae) and the conditioned stimulus (odor source). After the training, the time spent of conditioned wasps in the DMDS chamber was measured. Statistical analysis showed that the increasing concentrations involved an increase in the time spent in the chamber containing DMDS. This study indicates that N. vitripennis can respond to DMDS, which provide further support for its development as a biological sensor. [less ▲]

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See detailIs the multicolored Asian ladybeetle, Harmonia axyridis, the most abundant natural enemy to aphids in agroecosystems?
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

in Journal of Insect Science [=JIS] (2013), 13(158), 1-14

The multicolored Asian ladybeetle, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was introduced into Western Europe in the late 1990s. Since the late 2000s, this species has been commonly ... [more ▼]

The multicolored Asian ladybeetle, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was introduced into Western Europe in the late 1990s. Since the late 2000s, this species has been commonly considered one of the most abundant aphid predators in most Western European coun- tries. In spite of the large amount of research on H. axyridis, information concerning its relative abundance in agroecosystems is lacking. This study aims to evaluate the abundance of H. axyridis within the aphidophage community in four crops situated in southern Belgium: wheat, Triticum aestivum L. (Poales: Poaceae), corn, Zea mays, potato, Solanum tuberosum (Solanales: Solanaceae), and broad bean Vicia faba (Fabales: Fabaceae). In order to assess the species diver- sity, the collected data were analyzed by considering (1) the species richness and (2) the evenness according to the Shannon diversity index. Eleven aphidophages were observed in every invento- ried agroecosystem, including five abundant species: three coccinellids, the seven-spotted ladybug, Coccinella septempunctata L. (Coleoptera: Coccinellidae), the 14-spotted Ladybird, Propylea quatuordecimpunctata, and H. axyridis; one hoverfly, the marmalade hoverfly, Episyr- phus balteatus De Geer (Diptera: Syrphidae); and one lacewing, the common green lacewing, Chrysoperla carnea Stephens sensu lato (= s.l.) (Neuroptera: Chrysopidae). Harmonia axyridis has been observed to thrive, breed, and reproduce on the four studied crops. Harmonia axyridis is the most abundant predator of aphids in corn followed by C. septempunctata, which is the main aphid predator observed in the three other inventoried crops. In wheat and potato fields, H. axyridis occurs in low numbers compared to other aphidophage. These observations suggest that H. axyridis could be considered an invasive species of agrosystems, and that potato and wheat may intermittently act as refuges for other aphidophages vulnerable to intraguild predation by this invader. Harmonia axyridis is not the most abundant aphid predator in the main Belgian crops. [less ▲]

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See detailA four-year inventory of the invasive ladybeetle Harmonia axyridis in agricultural ecosystems
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Conference (2013, October 26)

The Multicoloured Asian Ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae) is known to thrive principally in shrubby and arboreal habitats. Its occurrence in agroecosystems remains poorly ... [more ▼]

The Multicoloured Asian Ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae) is known to thrive principally in shrubby and arboreal habitats. Its occurrence in agroecosystems remains poorly documented. This study focuses on the occurrence of this exotic species and its seasonal abundance in various field crops. The abundance of adults and larvae of H. axyridis was evaluated over a four-year period, from 2009 to 2012, in four important agronomical crops (wheat, corn, broad bean and potato) in Belgium. A total of 28 aphid predator species were observed including 14 coccinellid species, 13 hoverfly species and one lacewing species. H. axyridis is present and reproduces in all of the four crops studied, with the largest numbers recorded in corn and broad bean crops. In corn, H. axyridis numbers were found to increase over the four inventoried year, reaching 86% of the aphid predators in 2012, while it represented only 15% in 2009. H. axyridis was not always recorded where aphids were abundant, e.g. aphids were abundant on wheat where no H. axyridis were recorded. H. axyridis starts reproducing after the peak in aphid population, suggesting that H. axyridis is able to complete its development by feeding on alternative prey such as larvae and pupae of the same and other species of ladybird and other aphidophagous species. H. axyridis is often considered to be bivoltine but it only completes one generation per year in field crops. The second generation generally develops late in the season in other habitats. Harmonia axyridis is an invasive and an intraguild predator present in high quantities in some specific crops. In these crops, H. axyridis could negatively impact on population of native species due to IGP observed in several other studies. [less ▲]

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

Poster (2013, October 19)

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

Poster (2013, October 19)

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