What indicates a problem with fly infestation in food areas?

The presence of visible larvae is a strong and direct indicator of a fly infestation in food areas. Fly larvae, commonly known as maggots, are the immature stage of flies, and they typically develop in decaying organic matter, which can include food waste and spoiled food. Their visibility in an area suggests that adult flies have been laying eggs, leading to rapid reproduction and a potential infestation.

In food areas, the presence of larvae can signal a contamination risk and a need for immediate attention to sanitation practices. Proper hygiene and food storage practices are vital to mitigate the risk of fly infestations and protect food safety. Other options may represent various issues, but visible larvae are a clear sign of a fly problem specifically.