Which action is recommended to prevent mosquitoes from breeding in water barrels?

• A. Place mesh screens on barrels
• B. Leave barrels uncovered
• C. Fill with chlorine
• D. Store barrels in sun

Answer: (A)

Blocking mosquito access to standing water is essential because mosquitoes lay eggs on the surface of water where larvae develop. Placing a fine mesh on water barrels physically prevents adult mosquitoes from reaching the water, stopping eggs from being laid and larvae from growing. This keeps the water usable while removing the primary breeding site. Leaving barrels uncovered invites mosquitoes to access the water and breed. Chlorine can kill larvae, but maintaining the right residual level in barrels for safe drinking water is impractical for many setups and can affect taste. Storing barrels in the sun doesn’t stop breeding and can cause other issues like algae growth.