Flies

Flies belong to the order Diptera and are one of the main disease vectors in urban and industrial environments. The most relevant species in Mexico include the house fly (Musca domestica), the fruit fly (Drosophila spp.), and the green bottle fly (Lucilia sericata). Their short life cycle allows explosive populations under favorable conditions: a single female can lay up to 900 eggs over her lifetime and complete development from egg to adult in just 7 to 10 days.

Identification

Flies measure from 2 to 12 mm depending on the species, and their color ranges from the dark gray of the house fly to the yellow-brown of the fruit fly and the metallic green of the green bottle fly. They have large compound eyes covering much of the head, one pair of functional wings, and one pair reduced to halteres that gives them exceptional maneuverability. They typically settle near decomposing organic matter, garbage, animal excrement, and exposed food.

A useful detail: flies constantly rub their legs to clean their sensory receptors (taste and smell papillae located on the legs), which lets them detect food with great sensitivity. The house fly does not bite, but the stable fly (Stomoxys calcitrans) does; both can transmit diseases.

Signs of infestation

A fly population grows very fast, so recognizing the early signs is essential:

• Adults flying persistently around garbage, drains, ripe fruit, or food-preparation areas.
• Small dark specks (defecation and regurgitation spots) on walls, lamps, ceilings, and surfaces near activity hotspots.
• White larvae (maggots) in garbage, decomposing organic matter, or drains with built-up grime.
• Odors of decay or clogged drains, which point to active breeding sites nearby.

Risks

Flies are mechanical vectors: they carry over 100 pathogens on their legs and mouthparts, including bacteria that cause diarrhea, dysentery, cholera, typhoid fever, and conjunctivitis. They contaminate food when they land on it and when they regurgitate digestive juices to liquefy food before absorbing it, leaving pathogens with every contact. In the food industry, hospitality, and healthcare, their presence triggers non-conformities in health audits and poses a direct risk to safety and business reputation.

How Fucesa controls it

At Fucesa we tackle flies with an Integrated Pest Management (IPM) program that targets the entire cycle, not just the visible adults:

• Sanitation and breeding-site removal: cleaning drains, containers, and organic matter where larvae develop.
• Physical barriers: window screens, air curtains at entrances, and automatic-closing doors to block entry.
• UV light traps (insect light traps) and adhesive traps at strategic points to capture and monitor adults.
• Targeted applications and larvicides at identified hotspots, carried out by certified technicians.

Prevention

Sanitation is the best defense against flies. We recommend:

• Keep garbage in closed containers and clean waste areas frequently.
• Clean spills, food residue, and ripe fruit immediately; do not leave food exposed.
• Wash and disinfect drains periodically to remove the organic film where they breed.
• Install and maintain screens on windows and doors, and repair damaged mesh.

When to call a professional

If flies persist despite cleaning, if the activity occurs in a restaurant, industrial kitchen, hospital, or food plant, or if you cannot locate the breeding site, it is best to call a professional. Identifying the breeding source is often the difference between lasting control and constant reinfestation.

At Fucesa we have over 40 years of experience in pest control and operate in accordance with NOM-256-SSA1-2012 and with COFEPRIS registration, ensuring safe, technically backed programs for homes, businesses, and industry.