References of "Leroy, Pascal"
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See detailBiological control using Episyrphus balteatus (De Geer) (Diptera: Syrphidae)
Leroy, Pascal ULg; Verheggen, François ULg; Capella, Quentin et al

Poster (2010, May 18)

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer ... [more ▼]

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer) (Diptera: Syrphidae) is a promising candidate for aphid biological control: larvae of this syrphid attack and consume a wide range of aphid species and are found on many vegetable crops. Because natural populations of beneficials are not always sufficient to regulate the pest infestations, this work has focused on the conception of a biological control device containing syrphid eggs which can easily be introduced in fields or greenhouses. Using semiochemicals [E-(β)-farnesene, R-(+)-limonene and (Z)-3-hexenol], honeydews and “artificial honeydews” (10% or 30% aqueous solutions of sucrose, fructose and glucose), the syrphid oviposition was artificially induced on an inert surface. To test and validate the biological control device described above, laboratory and field experiments were performed: a plastic lamella covered with syrphid eggs was suspended on aphid infested plants in order to measure the efficiency of the device. The results obtained were promising since populations of 500 aphids were eliminated in ten days when 15 syrphid eggs were introduced. The use of such a biological control device could certainly contribute to aphid biological control strategies. [less ▲]

Detailed reference viewed: 51 (1 ULg)
See detailBiological control device using the aphidophagous hoverfly Episyrphus balteatus (De Geer) (Diptera: Syrphidae)
Leroy, Pascal ULg; Verheggen, François ULg; Francis, Frédéric ULg et al

Poster (2010, May 05)

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer ... [more ▼]

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer) (Diptera: Syrphidae) is a promising candidate for aphid biological control: larvae of this syrphid attack and consume a wide range of aphid species and are found on many vegetable crops. Because natural populations of beneficials are not always sufficient to regulate the pest infestations, this work has focused on the conception of a biological control device containing syrphid eggs which can easily be introduced in fields or greenhouses. To test and validate the biological control device described above, laboratory and field experiments were performed: a plastic lamella covered with syrphid eggs was suspended on aphid infested plants in order to measure the efficiency of the device. The results obtained were promising since populations of 500 aphids were eliminated in ten days when 15 syrphid eggs were introduced. The use of such a biological control device could certainly contribute to aphid biological control strategies. [less ▲]

Detailed reference viewed: 53 (6 ULg)
Peer Reviewed
See detailParticularities of Aphidius ervi embryo development and main limitations of its in vitro culture
Sabri, Ahmed ULg; Leroy, Pascal ULg; Hance, Thierry et al

Poster (2010, May 05)

Detailed reference viewed: 101 (33 ULg)
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See detailA fast gas chromatographic method for the study of semiochemical slow release formulations
Heuskin, Stéphanie ULg; Lorge, Stéphanie; Leroy, Pascal ULg et al

Poster (2010, January)

Detailed reference viewed: 31 (7 ULg)
See detailTreatment method using biological control
Leroy, Pascal ULg; Capella, Quentin ULg; Verheggen, François ULg et al

Patent (2009)

L’invention porte sur un dispositif de prévention et de lutte contre les insectes ravageurs, en particulier contre les pucerons (aphidiens)) de végétaux. L’invention porte donc également sur la méthode de ... [more ▼]

L’invention porte sur un dispositif de prévention et de lutte contre les insectes ravageurs, en particulier contre les pucerons (aphidiens)) de végétaux. L’invention porte donc également sur la méthode de production de ce dispositif. L’invention porte également sur l’utilisation de ce dispositif à proximité d’un végétal susceptible d’être infesté ou déjà infesté par un insecte ravageur tel que le puceron. [less ▲]

Detailed reference viewed: 111 (28 ULg)
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See detailL’impact du miellat de puceron au niveau des relations tritrophiques entre les plantes-hôtes, les insectes ravageurs et leurs ennemis naturels
Leroy, Pascal ULg; Capella, Quentin; Haubruge, Eric ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(2), 325-334

Tritrophic relations between plants, phytophagous insects and beneficials are based on the presence of chemical cues in the environment. In this context, honeydew (the aphid excretory product), rich in ... [more ▼]

Tritrophic relations between plants, phytophagous insects and beneficials are based on the presence of chemical cues in the environment. In this context, honeydew (the aphid excretory product), rich in sugars and amino-acids, constitutes a nutritional resource for beneficials but also acts as a volatile and a contact kairomone. On one hand, honeydew volatile chemicals cues guide beneficials to a food source, hosts or preys but also stimulate particular behaviors : searching, preys/hosts locations and attacks. On the other hand, a contact with honeydew induces the oviposition especially for syrphids (Episyrphus balteatus, …). The use of an artificial honeydew could be a way for enhancing the biological control efficiency in fields by increasing the number of beneficials but also the predation and parasitic rates. [less ▲]

Detailed reference viewed: 138 (10 ULg)
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See detailAphid honeydew is not only a sugary and amino-acid secretion
Leroy, Pascal ULg; Heuskin, Stéphanie ULg; Sabri, Ahmed ULg et al

Poster (2008)

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most ... [more ▼]

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most important are sugars (90-95% of the dry weight) and amino acids. This excretory product, used by parasitoids and predators, plays a crucial role in the tritrophic interactions : (1) honeydew is an important food complement and (2) honeydew acts as a volatile and a contact kairomone. These characteristics could be exploited for enhancing the biological control in fields through the use of an « artificial honeydew ». [less ▲]

Detailed reference viewed: 102 (33 ULg)
See detailOptimisation de l’oviposition du syrphe prédateur Episyrphus balteatus (DeGeer) (Diptera, Syrphidae) et élaboration d’une diète artificielle pour les larves aphidiphages
Leroy, Pascal ULg

Master of advanced studies dissertation (2007)

Episyrphus balteatus (DeGeer) (Diptera, Syrphidae) is an efficient predator for the biological control against aphids. A mass production of this beneficial is therefor opportune. In this context, the ... [more ▼]

Episyrphus balteatus (DeGeer) (Diptera, Syrphidae) is an efficient predator for the biological control against aphids. A mass production of this beneficial is therefor opportune. In this context, the present work considers simultaneously the artificial mass rearing of Episyrphus balteatus aphidophagous larvae and the oviposition optimization. [less ▲]

Detailed reference viewed: 114 (11 ULg)
See detailContribution à l'étude de la perception des métabolites secondaires d'origine végétale et aphidienne et de leurs impacts sur l'induction de la ponte du syrphe prédateur Episyrphus balteatus (DeGeer) (Diptera, Syrphidae)
Leroy, Pascal ULg

Master's dissertation (2006)

The predator Episyrphus balteatus (DeGeer) (Diptera, Syrphidae), efficient in the biological control against the aphids is able to perceive most of the volatile compounds from plants and aphids. All these ... [more ▼]

The predator Episyrphus balteatus (DeGeer) (Diptera, Syrphidae), efficient in the biological control against the aphids is able to perceive most of the volatile compounds from plants and aphids. All these semiochemicals define the different relationships between the three trophic levels (plant-phytophagous-predator) and directly help E. balteatus, as other predators and parasitoids, to locate their prey. In this context, our study highlights the importance of plant and aphid semiochemicals in the foraging behavior of the predator E. balteatus. [less ▲]

Detailed reference viewed: 31 (6 ULg)