Which adult trap targets host-seeking females using CO2 cues?

• A. CO2 traps
• B. Red box
• C. Gravid trap
• D. Ovitrap

Answer: (A)

The main idea here is how mosquitoes locate a host. Adult, host-seeking female mosquitoes rely on carbon dioxide—the gas we exhale—as a primary long-range cue to find a breath of a nearby host. A trap that emits CO2 mimics that signal, drawing those females in from a distance so they enter the trap and are captured. That makes CO2-based traps especially effective for monitoring and reducing biting females before they bite.

Gravid traps work on a different behavior: they attract females that have already taken a blood meal and are seeking a place to lay eggs, using cues from infusion scents rather than CO2. Ovitraps are designed to collect eggs, not to catch host-seeking females. The red box is another trap option that may use different attractants, but not specifically CO2 cues.