Which statement about Gravid traps is true?

• A. They lure male mosquitoes.
• B. They sample larval water counts.
• C. They lure adult female mosquitoes of mostly Culex species that have taken a blood meal.
• D. They are used only inside homes.

Answer: (C)

Gravid traps are designed to attract mosquitoes that have already taken a blood meal and are ready to lay eggs. They use an oviposition attractant, like a fermenting water infusion, to lure gravid females—primarily Culex species—into the trap where they can be collected for surveillance. This setup helps monitor adult female populations and assess risk near potential breeding sites, guiding control efforts. They are not aimed at males, they don’t sample larval water counts, and they’re typically used outdoors (not restricted to inside homes).