International Centre of Insect Physiology and Ecology, P.O Box 30772-00100, Nairobi, Kenya.
Faculty of Science and Technology, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya.
J Chem Ecol. 2024 Nov;50(11):654-662. doi: 10.1007/s10886-024-01489-8. Epub 2024 Mar 27.
This study investigates the efficacy of three different olfactory cues - cyclohexanone, linalool oxide (LO), and 6-methyl-5-heptan-2-one (sulcatone) - in attracting Aedes aegypti, the primary vector of dengue, using BG sentinel traps in a dengue-endemic area (urban Ukunda) in coastal Kenya. Two experiments were conducted. Experiment 1 compared solid formulations of the compounds in polymer beads against liquid formulations with hexane as the solvent. CO-baited traps served as controls. In Experiment 2, traps were baited with each compound in the polymer beads, commercial BG-Lure, and CO. Our results indicate that CO-baited traps recorded the greatest Ae. aegypti captures in both Experiment 1 and 2, whereas trap captures with polymer beads and solvent-based treatments were comparable. In experiment 2, polymer bead-based treatments yielded significantly greater female captures, each recording ~ 2-fold more captures than traps baited with the BG-Lure. There was no significant difference, however, between the treatments. Female Ae. aegypti captured in CO-baited traps were mainly unfed (91%), with fewer gravid mosquitoes (6.4%) compared to traps with test compounds (range; 12.7-21.1%). Male captures were lower in LO and BG-Lure baited traps compared to other treatments. Gravimetric analysis showed LO had a slower release rate compared to other compounds. The findings suggest that host-associated compounds loaded on polymer beads are more effective in trapping Ae. aegypti than commercial BG-Lure and reveal sex-specific differences in mosquito responses. These results have implications for mosquito surveillance and control programs, highlighting the potential for selective trapping strategies.
本研究在肯尼亚沿海登革热流行地区（城市 Ukunda）使用 BG 诱蚊诱卵器，调查了三种不同的嗅觉线索——环己酮、芳樟醇氧化物（LO）和 6-甲基-5-庚烷-2-酮（sulcatone）——对埃及伊蚊（登革热的主要传播媒介）的诱捕效果。进行了两项实验。实验 1 比较了聚合物珠粒中化合物的固体制剂与以正己烷为溶剂的液体制剂，CO 诱饵诱蚊器作为对照。在实验 2 中，诱蚊器分别用聚合物珠粒中的每种化合物、商业 BG-Lure 和 CO 进行诱捕。结果表明，CO 诱饵诱蚊器在实验 1 和 2 中捕获的埃及伊蚊最多，而聚合物珠粒和溶剂处理的诱蚊器捕获量相当。在实验 2 中，聚合物珠粒基处理的诱蚊器产生了显著更多的雌性捕获，每个诱蚊器捕获的雌性数量比用 BG-Lure 诱捕的诱蚊器多约 2 倍。然而，处理之间没有显著差异。在 CO 诱饵诱蚊器中捕获的雌性埃及伊蚊主要为未吸血（91%），与具有测试化合物的诱蚊器（范围为 12.7-21.1%）相比，带卵的蚊子较少。与其他处理相比，LO 和 BG-Lure 诱饵诱蚊器中的雄蚊捕获量较低。重量分析表明，与其他化合物相比，LO 的释放速度较慢。研究结果表明，负载在聚合物珠粒上的与宿主相关的化合物在诱捕埃及伊蚊方面比商业 BG-Lure 更有效，并揭示了蚊子对化合物的反应存在性别特异性差异。这些结果对蚊子监测和控制计划具有重要意义，突出了选择性诱捕策略的潜力。
