Wasps

Wasps are seasonal flying insects that pose a danger to whomever is near their nest. Aggressively protective, they can sting multiple times to protect their colony.

Wasp Types

There are a wide variety of wasps in Ontario. There are two main categories that they fall under. Social and solitary.

Yellowjacket Wasp (Vespula vulgaris)

Yellowjackets are social insects that are most active in the late summer to early fall. Their favourite foods are sweets and protein, often invading outdoor social gatherings to gather food. Allergies can develop after a sting. They can be found almost anywhere in their peak months and are territorial

Paper Wasps (Polistes spp.)

Their name taken from the nest material and its similarity to paper, the Paper wasp is sometimes called umbrella wasps due to the distinctive shape of their nests. Often found in residential yards, they are generally not aggressive unless they consider the colony to be in danger.

Bald Faced Hornets (Dolichovespula maculata)

Hornets are large wasps known for their potent stings and enclosed, paper-like nests. Unlike the paper wasps' open and umbrella-shaped nest, hornet nests are often spherical or teardrop-shaped. These nests are typically built in sheltered locations such as tree hollows, attics, wall cavities, or sheds.

Signs of Wasp Infestation

Visible papery nests in eaves, trees, or wall cavities, increased wasp activity near trash, gardens, or food, and audible buzzing near hidden nests are all telltale signs of wasp presence. Early detection is key, as nests start small in spring and grow rapidly. Ground nests may appear as small soil disturbances. Regularly inspect sheds, decks, and roof spaces for these indicators to manage potential wasp issues.

– Seal cracks and crevices around windows, doors, and eaves to block nest entry points.

– Keep food and drinks covered during outdoor meals or events.

– Remove outdoor garbage regularly and use tight-fitting lids on bins.

– Limit sweet-smelling plants or fruit trees near entrances.

– Inspect for early nests in spring and remove them before colonies grow.

Preventing Wasp Damage

Secure trash bins with tight lids and clean spills quickly. Seal cracks in walls, roofs, and vents to prevent nesting. Avoid leaving food or sweet drinks outside, as they attract wasps. Trim vegetation near buildings to minimize potential nesting sites. Regular maintenance and preventative measures are crucial for a wasp-free environment.

Effective Wasp Treatments

Never disturb active wasp nests yourself; doing so risks multiple stings. Professionals are best to treat wasps nests to eliminate the infestation and maintain a safe environment. After treatment, diligently monitor the previously affected areas for any signs of wasp resurgence. Professional intervention ensures the colony is fully eradicated, minimizing future risks.

Common Questions about Wasps

See below to learn more about Wasps in Ontario, including available treatment options and prevention.

Yellowjackets, paper wasps, and European hornets are prevalent. Bald-faced hornets (a type of yellowjacket) are also found in suburban areas.

Look for nests, frequent sightings near food sources, or buzzing sounds in walls. Multiple stings in one area indicate a nearby colony.

Food scraps, open trash, fallen fruit, and flowering plants. They also seek sheltered nesting sites like attics or sheds.

Most colonies die by late fall, but queens overwinter in sheltered spots. Nests are not reused but may attract new queens if not removed.

Yes. DIY removal is hazardous. Professionals safely relocate or destroy nests, especially those in high-traffic areas or structural voids.

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