Ants

Ants (family Formicidae) are social insects that form highly organized colonies. In Mexico, the most common pest species include the carpenter ant (Camponotus spp.), the pharaoh ant (Monomorium pharaonis), the Argentine ant (Linepithema humile), and the fire ant (Solenopsis invicta).

Identification

• Size: From 1 to 13 mm depending on species and caste.
• Color: Black, brown, red, or yellow depending on the species.
• Body: Three defined segments (head, thorax, abdomen) with a narrow waist.
• Antennae: Elbowed, a distinctive characteristic of ants.
• Colonies: From hundreds to millions of individuals with differentiated castes (queens, workers, soldiers).
• Signs: Foraging trails, dirt mounds, fine sawdust (carpenter ants), and presence in food areas.

Frequently Asked Questions

Why do ants appear after rain? Rain floods their underground nests, forcing them to seek shelter in structures. Moisture also favors the growth of fungi that some species cultivate.

Do carpenter ants eat wood? No, unlike termites, carpenter ants excavate wood to create nesting galleries but do not consume it. The fine sawdust they leave behind is a sign of their presence.

Hazards

Ants contaminate food and surfaces. Fire ants cause painful stings that can trigger severe allergic reactions. Carpenter ants weaken wooden structures. In hospitals, pharaoh ants are particularly dangerous because they can transport pathogens between sterile and contaminated areas.

Control and Prevention

• Source elimination: Clean spills immediately, store food in sealed containers.
• Sealing: Close cracks and entry points in the structure.
• Moisture control: Repair leaks and remove wet or decaying wood.
• Baits: Gel or bait stations that workers carry to the nest, eliminating the entire colony.
• Professional control: Species identification, nest location, and targeted treatment by certified technicians.