Amos Brogan A, Ritchie Scott A, Cardé Ring T
Department of Entomology, University of California, Riverside, CA.
College of Public Health, Medical and Veterinary Sciences, James Cook University, Smithfield, QLD, Australia.
J Med Entomol. 2020 Sep 7;57(5):1539-1549. doi: 10.1093/jme/tjaa065.
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.
埃及伊蚊是导致登革热、寨卡病毒病、基孔肯雅热和黄热病的病毒的重要传播媒介，因此对热带地区的公共卫生构成严重威胁。涉及改良雄性埃及伊蚊“饲养与释放”的控制项目正在进行，这需要有效的诱捕方法来监测释放的昆虫和受影响的野生蚊虫种群。BG-哨兵诱捕器（BGS）广泛用于埃及伊蚊监测，但其效率水平，即遇到诱捕器的蚊子被捕获的比例尚不清楚。对于雄性蚊子来说尤其如此，其行为尚未完全了解。我们测试了两种版本的BGS在半野外条件下捕获雄性埃及伊蚊的效率，有无二氧化碳和人类皮肤气味模拟诱饵以及这些诱饵组合的情况。一个发出二氧化碳和人类皮肤气味模拟物的藏青色BGS诱捕器捕获了18%的释放雄性埃及伊蚊，捕获效率为9%（占与诱捕器总接触次数的比例）。雄性埃及伊蚊多次与BGS接触但未被捕获；它们越过诱捕器入口而未被捕获，或落在诱捕器侧面。即使只存在视觉线索，也记录到了BGS周围的群聚行为。了解雄性埃及伊蚊在与BGS接触时的行为可以为诱捕器设计的改进提供依据，从而提高控制项目监测中的捕获效率。
