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Attraction Versus Capture II: Efficiency of the BG-Sentinel Trap Under Semifield Conditions and Characterizing Response Behaviors of Male Aedes aegypti (Diptera: Culicidae).

Authors
  • Amos, Brogan A1
  • Ritchie, Scott A2, 3
  • Cardé, Ring T1
  • 1 Department of Entomology, University of California, Riverside, CA.
  • 2 College of Public Health, Medical and Veterinary Sciences, James Cook University, Smithfield, QLD, Australia. , (Australia)
  • 3 Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, QLD, Australia. , (Australia)
Type
Published Article
Journal
Journal of Medical Entomology
Publisher
Oxford University Press
Publication Date
Sep 07, 2020
Volume
57
Issue
5
Pages
1539–1549
Identifiers
DOI: 10.1093/jme/tjaa065
PMID: 32363393
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Aedes aegypti (L.) is an important vector of viruses causing dengue, Zika, chikungunya, and yellow fever and as such presents a serious threat to public health in tropical regions. Control programs involving 'rear and release' of modified male Ae. aegypti are underway and require effective trapping methods for surveillance of both the released insects and the impacted wild mosquito population. The BG-Sentinel trap (BGS) is widely used in Ae. aegypti surveillance but its level of efficiency, that is, what proportion of the mosquitoes encountering the trap are captured, is unknown. This is especially true for male mosquitoes, the behavior of which is incompletely understood. We tested the efficiency of two versions of the BGS for capturing male Ae. aegypti under semifield conditions with and without CO2 and a human skin odor mimic lure and with these baits combined. A navy-blue BGS trap emitting CO2 and a human skin odor mimic captured 18% of the released male Ae. aegypti, with a capture efficiency of 9 % (of the total encounters with the trap). Male Ae. aegypti had multiple encounters with the BGS that did not result in capture; they crossed over the trap entrance without being captured or landed on the sides of the trap. Swarming behavior around the BGS was also recorded, even when only a visual cue was present. Understanding male Ae. aegypti behaviors during an encounter with the BGS can inform improvement of trap design and therefore capture efficiency for surveillance in control programs. Published by Oxford University Press on behalf of Entomological Society of America 2020.

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