House Flies

About House Flies

House flies are among the most common pests found in Orange County homes and food service establishments. These medium-sized gray flies with four dark stripes on the thorax are prolific breeders that develop in decaying organic matter, garbage, and animal waste. House flies do not bite, but they pose significant health risks because they land on filth and then contaminate food and surfaces by regurgitating digestive fluids and depositing bacteria with every landing. A single house fly can carry over 100 different pathogens, including those causing food poisoning, dysentery, and eye infections. Effective control requires eliminating breeding sources and implementing targeted treatments.

How to Identify House Flies

• Gray, about 1/4 inch long with four dark longitudinal stripes on the thorax
• Large reddish compound eyes that nearly touch on the top of the head
• Sponging mouthparts that liquefy food before ingestion (no biting)
• Rapid, buzzing flight pattern with frequent landing on surfaces and food

Lifecycle

House flies develop through complete metamorphosis. Females lay clusters of 75 to 150 eggs on moist organic material, which hatch within 12 to 24 hours. Larvae (maggots) feed for 3 to 7 days before pupating. Adults emerge after 3 to 6 days and can live for 15 to 25 days, during which a single female may lay up to 500 eggs total.

Health & Property Risks

• Transmit over 100 pathogens including Salmonella, E. coli, and cholera
• Contaminate food and food preparation surfaces with every landing
• Breed rapidly in garbage, pet waste, and organic debris