What do gravid traps utilize to attract female mosquitoes?

Gravid traps are specifically designed to attract female mosquitoes that are seeking a place to lay their eggs. To accomplish this, these traps utilize water that is enriched with organic material, such as decaying leaves or other natural debris. The presence of organic matter in the water simulates an ideal breeding site for mosquitoes, as many species are drawn to water sources that contain potential food for their larvae.

By using this method, gravid traps effectively mimic the natural conditions that these mosquitoes prefer for oviposition (egg-laying). This makes them a valuable tool in mosquito control and surveillance efforts, as they can help capture and monitor female mosquito populations, which are responsible for reproduction and can be vectors for various diseases.