Wasps

Wasps (order Hymenoptera, suborder Apocrita) include various social and solitary species. In Mexico, the most problematic are the paper wasp (Polistes spp.), the yellow jacket (Vespula spp.) and the hornet (Vespa spp.). Unlike bees, wasps can sting multiple times and become highly aggressive when defending their nests. Although they play a useful ecological role as predators of other insects, when they nest next to homes, businesses or recreational areas they become a risk that should be addressed through Integrated Pest Management (IPM).

Identification

Size: 10 to 25 mm depending on the species. Color: yellow and black (yellow jacket), brown with bands (paper wasp), or black with white markings. The body has a very narrow waist between thorax and abdomen and little hair, which distinguishes wasps from bees, which are hairier and stockier.

Nests: the paper wasp (Polistes) builds open, umbrella-shaped combs; the yellow jacket (Vespula) makes enclosed, spherical paper nests, often in cavities, walls, attics or underground. They are commonly found on eaves, trees, cavities and structures. Behavior: they are insect predators and food scavengers, drawn to sweets, meats and beverages, particularly in late summer and autumn.

Signs of infestation

• Wasps repeatedly entering and leaving through the same point in a wall, eave or cavity.
• Paper-like nests, small at the start of the season and growing steadily larger.
• Increased wasp activity around trash bins, outdoor tables and food areas.
• An audible buzzing inside walls or ceilings when the nest is hidden in a cavity.

Risks

Wasp stings cause intense pain, swelling and redness. In allergic individuals they can trigger anaphylaxis, a potentially fatal reaction that requires urgent medical attention. Because wasps sting repeatedly and attack as a group when the nest is threatened, multiple stings can be dangerous even for non-allergic people, especially children and the elderly. In commercial, school and recreational settings, the presence of nests represents a liability risk and may force the closure of shared areas.

How Fucesa controls it

Professional wasp control centers on the safe removal of the nest, not on random insecticide application. At Fucesa we follow an Integrated Pest Management protocol:

• Inspection and location: pinpointing the nest and the species, since each one requires different handling.
• Nest treatment and removal: targeted application and physical removal of the nest, carried out with proper protective equipment and preferably at dawn or dusk, when the colony is least active.
• Cavity sealing: once the colony is eliminated, access points in walls, roofs and foundations are closed so another colony cannot reoccupy them.
• Baited traps: in areas of human activity, they help reduce populations and monitor the area.

Important: never try to burn, hit or seal a nest yourself; these actions provoke mass attacks. A single nest can hold hundreds or thousands of aggressive wasps.

Prevention

• Regularly inspect eaves, attics, trees and cavities for developing nests, when they are easy to remove.
• Cover food and beverages outdoors and keep garbage containers sealed.
• Seal cracks and access points to cavities in walls, roofs and foundations before nesting season.
• Pick up fallen fruit and food scraps from the garden, which attract scavenging wasps.

When to call a professional

Whenever you find an active nest, especially if it is near entrances, windows, play areas or walkways, do not attempt to remove it yourself: keep your distance and contact pest control professionals. You should also call immediately if there are allergic individuals on the premises or if the nest is hidden inside a wall or ceiling.

Fucesa has more than 40 years of experience in pest control. We operate with personnel certified under NOM-256-SSA1-2012 and registered with COFEPRIS, carrying out nest removal with proper protective equipment from our headquarters in Toluca and our base in Queretaro.