Which practice is identified as the primary control for house flies?

• A. Bait
• B. Sanitation
• C. Screens
• D. Light Traps

Answer: (B)

The main idea being tested is that removing what attracts and sustains a pest is the most effective way to control it in the long term. For house flies, sanitation is the foundation of control because flies reproduce in decaying organic matter and are drawn to unhygienic conditions. By improving sanitation—promptly removing trash, cleaning up spilled food and liquids, properly sealing and storing leftovers, and eliminating breeding sites—you cut off both food sources and environments where eggs and larvae can develop. This tackles the problem at its source and leads to a sustained reduction in fly numbers.

Bait, while helpful for reducing adult fly activity, doesn’t prevent new flies from emerging or breeding sites from lingering. Screens reduce entry but don’t address indoor sources or breeding grounds, and flies can still breed in exterior areas or in waste. Light traps can kill some flies but require constant operation and don’t remove the underlying breeding sites. In practice, sanitation serves as the primary control method, with traps, bait, and screens used as supplementary tools to enhance overall management.