Abstract
BackgroundThe trend in chemical insecticide development has focused on improving the efficacy against mosquitoes while reducing the environmental impact. Lethal lures apply an “attract-and-kill” strategy that draws the insect to the killing agent rather than bringing the killing agent to the insect.MethodsIn this study, the mosquito oviposition pheromone was extracted from the eggs of Aedes aegypti (L.) and further investigated with a combination of pheromone and granular temephos as a lethal lure.ResultsThe compound caproic acid attracted significantly more egg-laying mosquitos at 1 ppm (660.83 ± 91.61) than the control (343.83 ± 56.24), which consisted of solvent only (Oviposition Activity Index: 0.316). Further investigation of the combination of caproic acid with granular temephos as a lethal lure attracted significantly more gravid female Ae. aegypti to oviposit their eggs than the temephos treated water and control.ConclusionsThis indicated the ability of caproic acid in acting as an attractant and counters the repellency effect of temephos. Additionally, the presence of temephos in the lethal lure also restricted the hatching of the eggs and killed any larvae that hatched.
Highlights
The trend in chemical insecticide development has focused on improving the efficacy against mosquitoes while reducing the environmental impact
The selection is based on short-chain fatty acids that have fewer than 16 carbons [19]
Identification of mosquito oviposition pheromone most of the extraction methods involved methanol being rinsed off by distilled water, a major disadvantage is that two distinct observable layers were not formed because methanol is completely miscible with water
Summary
The trend in chemical insecticide development has focused on improving the efficacy against mosquitoes while reducing the environmental impact. Lethal lures apply an “attract-and-kill” strategy that draws the insect to the killing agent rather than bringing the killing agent to the insect. Insecticides have been the mainstay for mosquito control because they immediately suppress mosquito populations [2,3,4]. They have caused undesirable effects such as the development of insecticide resistance, destruction of non-target organisms and endangerment to human health though exposure by handling and/or consumption of the insecticide [3,4] depending on the application method and climatic factors, only 10% of. The chemical ecology of mosquito semiochemicals is still poorly understood, and more
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