Publications of Landry Sarles
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See detailSemiochemicals to control the Walnut husk fly Rhagoletis completa
Sarles, Landry ULiege; Verhaeghe, Agnès; Verheggen, François ULiege

in Crop Protection, Ghent Proceedings, May 21 2018 (2018, August)

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See detailSemiochemicals to control the Walnut husk fly Rhagoletis completa
Sarles, Landry ULiege; Verhaghe, Agnès; Verheggen, François ULiege

Poster (2018, August)

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See detailOptimisation of Hermetia illucens reproduction according to appropriate laying sources
Hoc, Bertrand ULiege; Martin, Clément ULiege; Sarles, Landry ULiege et al

Poster (2018, August)

Insects are an underused protein source. They could be integrated into human and livestock diets to enrich protein deficient diets. Hermetia illucens, also known as the black soldier fly (BSF), stands out ... [more ▼]

Insects are an underused protein source. They could be integrated into human and livestock diets to enrich protein deficient diets. Hermetia illucens, also known as the black soldier fly (BSF), stands out as a potential candidate for food and feed. Indeed, its larvae can be easily reared on a wide range of organic matters. A steady input of larvae is required for the mass rearing. For this reason, improvement of the rearing condition should be performed. As the laying sources can be wide, we decided to highlight the most efficient sources by means of behavioural trial and volatolomic essay. We therefore hypothesize that BSF chose their laying sources thanks to volatile organic compounds (VOCs) as most of other flies [less ▲]

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See detailEffect of Plant Growth Promoting Rhizobacteria on aphids reproduction and feeding behaviour
Quaghebeur, Céleste; Serteyn, Laurent ULiege; Stouvenakers, Gilles ULiege et al

Poster (2018, August)

Some soil bacteria belonging to the Bacillus and Pseudomonas genera are particularly efficient biocontrol agents as Plant Growth Promoting Rhizobacteria (PGPR) by showing strong antagonistic activity ... [more ▼]

Some soil bacteria belonging to the Bacillus and Pseudomonas genera are particularly efficient biocontrol agents as Plant Growth Promoting Rhizobacteria (PGPR) by showing strong antagonistic activity toward plant pathogens and inducing systemic resistance (ISR). Beside plant pathogen microbial agents, phytophagous insects should also be impacted by ISR in host plants. Particularly, aphids are considered as herbivore models closed to fungal and bacterial plant pathogens when comparing host plant induced defense mechanisms after aphid attacks. Then, PGPR could play a primary role in interspecific interactions related to plants and aphids including changes in aphid behaviour. This poster shows the preliminary results of our work on interactions between PGPR, host plant and aphids. Among them, we can highlight the induction of phytohormones by PGPR application and the resulting changes in reproduction and feeding behavior of aphids. It seems that secundary endosymbionts play a preponderant role in aphid’s tolerance of elicitated plants. More researches are in progress, based on these trends. Further works will focus on the volatile organic compounds potentially involved in that response and their actual impact on host plant selection by aphids. [less ▲]

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See detailSemiochemicals to control the Walnut husk fly Rhagoletis completa
Sarles, Landry ULiege; Verhaeghe, Agnès; Verheggen, François ULiege

Conference (2018, July)

Most European walnut producers have to deal with the recent introduction of the Walnut Husk Fly, Rhagoletis completa (Diptera, Tephritidae), that causes severe economic losses, especially in biological ... [more ▼]

Most European walnut producers have to deal with the recent introduction of the Walnut Husk Fly, Rhagoletis completa (Diptera, Tephritidae), that causes severe economic losses, especially in biological productions. In orchards where R. completa is present and uncontrolled, losses in walnut yields can reach up to 80%. As a consequence, there is a need for developing environment-friendly methods of control. In this research, we evaluated the efficiency of two different semiochemical blends to trap R. completa in walnut orchards. The first semiochemical blend consisted in walnut fruit volatiles, previously collected and identified from two walnut varieties. The second semiochemical blend was made of the putative male sex pheromone, made of two lactones, and previously collected from R. completa males. In field both semiochemical blends were associated with yellow sticky traps. The assays were conducted in France, in a total of 53 orchards, in 2015, 2016 and 2017. The first blend (made of fruit kairomones) was highly attractive for both male and female R. completa in a laboratory assay, but did not enhance the number of fly captures in the field. On the other hand, sticky traps associated with the putative sex pheromone captured up to 10 times more fruit flies each week during the entire season. The total number of captured flies was also more important than with a mass trapping system baited with food attractant. These field results are promising for R. completa monitoring and mass trapping. [less ▲]

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See detailSemiochemicals to control the Walnut husk fly Rhagoletis completa
Sarles, Landry ULiege; Verhaeghe, Agnès; Verheggen, François ULiege

Poster (2018, May 22)

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See detailImproving the Monitoring of the Walnut Husk Fly (Diptera: Tephritidae) Using Male-Produced Lactones
Sarles, Landry ULiege; Fassotte, Bérénice ULiege; Boullis, Antoine et al

in Journal of Economic Entomology (2018), 111(5), 2032-2037

It is important to monitor fruit flies (Diptera: Tephritidae) efficiently to implement sustainable means of control. Attractants are often used to increase the efficiency of sticky traps deployed in ... [more ▼]

It is important to monitor fruit flies (Diptera: Tephritidae) efficiently to implement sustainable means of control. Attractants are often used to increase the efficiency of sticky traps deployed in orchards to monitor Lepidopterans, but remains to be developed to monitor fruit flies. Rhagoletis completa Cresson (Diptera: Tephritidae) is an invasive species in the walnut orchards of Europe, and is commonly monitored with yellow sticky traps. In this study, we collected the volatile compounds released by male and female R. completa, and identified two lactones released exclusively by males. We then formulated both lactones in long-lasting volatile dispensers, and we quantified their release rate over a 26-d period. Finally, during the entire period when female flies are present in the field, we compared the efficiency of the conventional monitoring method using unbaited yellow sticky traps with yellow sticky traps associated with a dispenser releasing both male-produced lactones. These assays were conducted in 54 walnut orchards in France, in 2017. The number of fruit flies caught with sticky traps associated with lactones dispensers was increased by up to 10 times each week. Lactone-baited traps also allowed earlier detection in the season. These field results are promising for R. completa monitoring. A complete chiral identification of these lactones should be performed along with a clarification of their role in the sexual communication of R. completa. [less ▲]

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See detailElevated carbon dioxide concentration reduces alarm signaling in aphids
Boullis, Antoine ULiege; Fassotte, Bérénice ULiege; Sarles, Landry ULiege et al

in Journal of Chemical Ecology (2017), 43

Insects often rely on olfaction to communicate with surrounding conspecifics. While the chemical language of insects has been deciphered in recent decades, few studies have assessed how changes in ... [more ▼]

Insects often rely on olfaction to communicate with surrounding conspecifics. While the chemical language of insects has been deciphered in recent decades, few studies have assessed how changes in atmospheric greenhouse gas concentrations will impact pheromonal communication by insects. Here, we hypothesize that changes in the concentration of atmospheric carbon dioxide (CO2) affect the whole dynamics of alarm signaling in aphids, including: (1) the production of the active compound (E)-β-farnesene (Eβf), (2) emission behavior when under attack, (3) perception by the olfactory apparatus, and (4) the escape response. We reared two strains of the pea aphid Acyrthosiphon pisum under ambient and elevated CO2 concentrations for several generations. We found that an increase in CO2 concentration reduced the production (i.e., individual content) and emission of Eβf (released under predation events). While no difference in Eβf neuronal perception was observed, we found that an increase in CO2 strongly reduces the escape behavior expressed by an aphid colony following exposure to natural doses of the alarm pheromone. In conclusion, our results confirm that changes to greenhouse gases do impact chemical communication in insects, and could potentially have a cascade effect on interactions with higher trophic levels. [less ▲]

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See detailIdentification of walnut husk (Juglans regia L.) volatiles and the behavioural response of the invasiveWalnut Husk Fly, Rhagoletis completa Cresson
Sarles, Landry ULiege; Boullis, Antoine ULiege; Fassotte, Bérénice ULiege et al

in Pest Management Science (2017)

Abstract BACKGROUND: Several European countries are important walnut (Juglans regia L.) producers. However, these countries must contendwith the recent introduction of theWalnut Husk Fly,Rhagoletis ... [more ▼]

Abstract BACKGROUND: Several European countries are important walnut (Juglans regia L.) producers. However, these countries must contendwith the recent introduction of theWalnut Husk Fly,Rhagoletis completa Cresson (Diptera, Tephritidae),which is causing severe economic losses, especially in organic production. Because most Tephritid fruit flies use kairomones in their search for host plants, we hypothesise that this highly specialist species orients toward the volatile blend released by walnut husks. RESULTS:We collected, identified, and quantified the volatile organic chemicals (VOCs) released by walnut husks from themost commonly cultivated variety in France (Franquette). Then, the behavioural response of R. completa toward synthetic odour blends was recorded in dual choice assays conducted in net cages. A total of 26 VOCs were identified, with 𝜶-pinene, 𝜷-pinene, trans-linalool, eugenol, and tetradecane representing the major constituents. In the dual choice assay, male and female R. completa were strongly attracted to synthetic blend that includedmost of the identified husk VOCs. CONCLUSION:When searching for a host plant, R. completa use host fruit kairomones. The potential of these semiochemicals in monitoring andmanagement of this quarantine pest is discussed. [less ▲]

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See detailDevelopment of a semiochemical-based control method against the walnut husk fly, Rhagoletis completa Cresson
Sarles, Landry ULiege; Lognay, Georges ULiege; Verhaeghe, Agnès et al

Poster (2016, September 15)

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See detailDevelopment of a semiochemical-based control method against the walnut husk fly
Sarles, Landry ULiege; Heuskin, Stéphanie ULiege; Verheaghe, Agnès et al

Conference (2016, May 17)

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See detailMultitrophic interactions between plants-viruses-aphidiphagous
Bosquée, Emilie ULiege; Chevalier Mendes Lopes, Thomas ULiege; Boullis, Antoine ULiege et al

Conference (2015, November 06)

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