Effect of BG-Lures on the Male <i>Aedes</i> (Diptera: Culicidae) Sound Trap Capture Rates

Competent arbovirus vectors are found in the culicid mosquito fauna of south-west Indian Ocean (SWIO) islands. In La Reunion, Aedes albopictus and Aedes aegypti mosquitoes are known vectors of dengue and chikungunya viruses. Culex quinquefasciatus is a potential vector of Rift Valley fever and West Nile viruses. To prepare a vector-control field trial against Ae. aegypti, this study aimed at identifying the best trapping strategy to catch adult Ae. aegypti, using BG-Sentinel traps (Biogents, Germany). It was implemented in two sites in southern La Reunion. Catches of Ae. albopictus and Cx. quinquefasciatus mosquitoes were also recorded. A Latin square design was used to estimate the detection probability and the apparent daily density—according to the BG-Sentinel trapping strategy: none, carbon dioxide (CO2), a commercial attractant—BG-Lure (Biogents, Germany), or both. The use of CO2 alone was associated with a higher detection probability for Ae. aegypti and Cx. quinquefasciatus mosquitoes, as well as a large increase in their apparent density. Traps with BG-Lure—alone or in combination with CO2, did not improve the detection probability of Ae. aegypti and Cx. quinquefasciatus mosquitoes. The same result was found for male Ae. albopictus. For females, baiting BG-Sentinel traps with CO2 or BG-Lure had no significant effect. The same apparent densities were found for Ae. aegypti and Ae. albopictus mosquitoes in both study sites—where Ae. aegypti mosquitoes were found at very low densities during previous surveys.

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“…Also, Staunton et al . 21 did not observe any impact of BG-Lure on the catches of Ae. aegypti and Ae.…”

Section: Discussionmentioning

confidence: 64%

“…However, some studies have found that BG-Sentinel traps baited with CO 2 alone were able to catch significantly more individuals than BG-Sentinel traps baited with BG-Lure-coupled or not with CO 2 20 . Also, Staunton et al 21 did not observe any impact of BG-Lure on the catches of Ae. aegypti and Ae.…”

Section: Discussionmentioning

confidence: 91%

Optimization of adult mosquito trap settings to monitor populations of Aedes and Culex mosquitoes, vectors of arboviruses in La Reunion

Claudel

Brouazin

Lancelot

et al. 2022

Sci Rep

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“…[19] However, some studies have found BG traps baited with CO 2 alone were able to catch signi cantly more individuals than BG traps baited with BG-Lure -coupled or not with CO 2 . [20] Also, Staunton et al [21] did not observe any impact of BG-Lure on the catches of Ae. aegypti and Ae.…”

Section: Discussionmentioning

confidence: 92%

To bait or not to bait? Optimizing the use of adult mosquito traps for monitoring arbovirus vector populations in La Réunion Island

Claudel

Brouazin

Lancelot

et al. 2022

Preprint

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Competent arbovirus vectors are found in the culicid mosquito fauna of south-west Indian Ocean (SWIO) islands. In La Réunion Island, Aedes albopictus and Aedes aegypti mosquitoes are known vectors of dengue and chikungunya viruses. Culex quinquefasciatus is a potential vector of Rift Valley fever and West Nile viruses. To prepare a vector-control field trial against Ae. aegypti, this study aimed at identifying the best baiting scheme to catch adult Ae. aegypti, using BG-Sentinel™ traps (Biogents). It was implemented in two sites in southern La Réunion Island. Catches of Ae. albopictus and Cx. quinquefasciatus mosquitoes were also recorded. A Latin square design was used to estimate the detection probability and the apparent daily density - according to the BG-sentinel trap baiting scheme: none, carbon dioxide (CO2), a commercial attractant - BG-Lure™ (Biogents), or both. The use of CO2 alone was associated with a higher detection probability for Ae. aegypti and Cx. quinquefasciatus mosquitoes, as well as a large increase in their apparent density. Traps with BG-Lure - alone or in combination with CO2, did not improve the detection probability of Ae. aegypti and Cx. quinquefasciatus mosquitoes. The same result was found for male Ae. albopictus. For females, baiting BG traps with CO2or BG-Lure had no significant effect. The same apparent densities were found for Ae. aegypti and Ae. albopictus mosquitoes in both study sites - where Ae. aegypti mosquitoes were found at very low densities during previous surveys.

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Automated differentiation of mixed populations of free-flying female mosquitoes under semi-field conditions

Johnson,

Weber,

Al-Amin

et al. 2024

Sci Rep

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Great advances in automated identification systems, or ‘smart traps’, that differentiate insect species have been made in recent years, yet demonstrations of field-ready devices under free-flight conditions remain rare. Here, we describe the results of mixed-species identification of female mosquitoes using an advanced optoacoustic smart trap design under free-flying conditions. Point-of-capture classification was assessed using mixed populations of congeneric (Aedes albopictus and Aedes aegypti) and non-congeneric (Ae. aegypti and Anopheles stephensi) container-inhabiting species of medical importance. Culex quinquefasciatus, also common in container habitats, was included as a third species in all assessments. At the aggregate level, mixed collections of non-congeneric species (Ae. aegypti, Cx. quinquefasciatus, and An. stephensi) could be classified at accuracies exceeding 90% (% error = 3.7–7.1%). Conversely, error rates increased when analysing individual replicates (mean % error = 48.6; 95% CI 8.1–68.6) representative of daily trap captures and at the aggregate level when Ae. albopictus was released in the presence of Ae. aegypti and Cx. quinquefasciatus (% error = 7.8–31.2%). These findings highlight the many challenges yet to be overcome but also the potential operational utility of optoacoustic surveillance in low diversity settings typical of urban environments.

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Effect of BG-Lures on the Male Aedes (Diptera: Culicidae) Sound Trap Capture Rates

Cited by 5 publications

References 33 publications

Optimization of adult mosquito trap settings to monitor populations of Aedes and Culex mosquitoes, vectors of arboviruses in La Reunion

Optimization of adult mosquito trap settings to monitor populations of Aedes and Culex mosquitoes, vectors of arboviruses in La Reunion

To bait or not to bait? Optimizing the use of adult mosquito traps for monitoring arbovirus vector populations in La Réunion Island

Automated differentiation of mixed populations of free-flying female mosquitoes under semi-field conditions

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