Most people use the words hornet and wasp interchangeably, and most of the time it does not matter. Until there is a nest on your property. At that point, the distinction becomes practically significant, because hornets and wasps behave differently, nest in different locations, and require different approaches to remove safely. Across Burlington, Hamilton, and Oakville, Action Pest responds to stinging insect calls throughout the warmer months, and misidentification is one of the most consistent reasons a homeowner ends up in a dangerous situation trying to handle a nest they were not prepared for.
The Key Differences Between Hornets and Wasps
Hornets are technically a subset of wasps, belonging to the same order Hymenoptera, but the species encountered in Burlington and across southern Ontario differ meaningfully in size, temperament, and nesting behaviour. Understanding these differences helps property owners assess the level of risk they are dealing with before making any decisions about intervention.
The bald-faced hornet (Dolichovespula maculata) is the species most commonly referred to as a hornet in Ontario. It is larger than most wasp species, black and white in colouring, and builds the large, grey, papery enclosed nests commonly found hanging from tree branches, eaves, and utility structures. Bald-faced hornets are significantly more aggressive than most wasp species when their nest is disturbed, and their defensive response is faster and more sustained. A colony can number in the hundreds by late summer.
The yellowjacket (Vespula spp.) is the species most Burlington homeowners are actually encountering when they report wasps. Yellowjackets are smaller, yellow and black, and nest in a wider variety of locations including underground burrows, wall voids, deck structures, and attic spaces. They are highly opportunistic foragers, which is why they are most commonly encountered near outdoor dining areas, garbage receptacles, and food preparation spaces during summer months.
The European paper wasp (Polistes dominula) is a third species worth recognising. Slender, with a distinct narrow waist and longer legs that dangle visibly in flight, paper wasps build smaller, open-celled nests typically found under eaves, inside pergola frames, and along fence rails. They are generally less aggressive than yellowjackets unless the nest is directly threatened.
Where Each Species Nests and Why It Matters
Nest location determines the risk level and the complexity of removal. Bald-faced hornet nests suspended from trees or eaves are visible and accessible, but their size and the aggressiveness of the colony make unsupervised removal extremely inadvisable. A mature bald-faced hornet nest in late summer can house several hundred workers, all of whom will respond defensively within seconds of a perceived threat to the structure.
Yellowjacket nests located in wall voids or underground present a different category of challenge. An underground yellowjacket colony disturbed by a lawnmower, garden tool, or foot traffic can produce an immediate and overwhelming defensive response that leaves very little time to retreat. Wall void nests are equally problematic because applying a retail aerosol into the void without knowing the nest’s extent risks agitating thousands of workers who then seek alternative exits, which sometimes means into the interior of the home.
This is precisely why professional identification of the species and nest location before any treatment is attempted is not simply a recommendation but a genuine safety consideration. Under Canada’s Pest Control Products Act, pesticide products are registered for specific applications and use conditions, and applying them outside those conditions, including into concealed spaces without appropriate equipment and training, constitutes an unlawful and potentially hazardous use.
The Medical Risk Is Higher Than Most People Realise
Both hornets and wasps are capable of stinging multiple times, unlike honeybees which are limited to a single sting. This capability, combined with the alarm pheromones that recruit additional colony members during a defensive response, means that a disturbed nest can result in a significant number of stings delivered very quickly.
For individuals with venom hypersensitivity, a single sting from either species can trigger anaphylaxis, a systemic allergic reaction that constitutes a medical emergency requiring immediate intervention. Health Canada estimates that allergic reactions to insect stings account for a meaningful number of emergency department visits across Canada annually, and many of those individuals were unaware of their sensitivity prior to the reaction.
Even without a known allergy, mass envenomation from multiple simultaneous stings carries risks that are not limited to pain and swelling. Children, elderly individuals, and pets are particularly vulnerable to the effects of multiple stings and should be considered when assessing the urgency of nest removal on a residential property.
What Burlington Homeowners Should Do When They Find a Nest
The appropriate first response upon discovering a nest, regardless of species, is to restrict access to the area and avoid disturbing the structure. Do not attempt to knock down, spray, or cover the nest with household materials. Do not seal the entry point of a wall void or underground nest, as this will trap insects inside the structure and create pressure that forces them to seek alternative exits.
Document the nest location, approximate size, and any observable species characteristics and contact a licensed pest control professional for an assessment. Timing of treatment matters as well. Stinging insect activity is highest during daylight hours when foragers are active. Professional treatments are typically most effective and safest when carried out at dusk or dawn when the majority of the colony is present within the nest and defensive activity is reduced.
For commercial properties in Burlington where stinging insects are nesting in proximity to staff or customers, the duty of care obligations imposed by the Occupational Health and Safety Act (R.S.O. 1990, c. O.1) make prompt professional intervention a legal consideration in addition to a practical one.
Prevention Measures That Reduce Nesting Risk
A meaningful component of stinging insect management is reducing the conditions that make your property attractive for nest establishment in the first place. Queens emerging in early spring are actively scouting for sheltered, enclosed spaces to initiate colony development. Ensuring that eave gaps, soffit panels, deck framing voids, and roofline penetrations are sealed before spring activity peaks significantly reduces the number of viable nesting sites available on your property.
Removing food attractants is equally important for yellowjackets specifically, as their foraging behaviour is closely tied to protein and sugar sources. Keeping outdoor garbage secured, cleaning food residue from outdoor dining surfaces promptly, and covering beverages when eating outside all reduce the foraging incentive that draws yellowjackets into proximity with people. The City of Burlington’s property standards resources offer additional guidance relevant to exterior property maintenance that supports pest prevention.
Contact Action Pest for Safe, Effective Nest Removal
Whether you are dealing with a bald-faced hornet nest suspended from your roofline or a yellowjacket colony established inside a wall void, professional removal is the only approach that addresses the full scope of the risk safely and completely.
Action Pest provides hornet and wasp removal services across Burlington, Hamilton, Oakville, and surrounding communities, with immediate response available seven days a week. Industry-leading guarantees, competitive pricing, and quote matching make professional stinging insect control the practical choice for homeowners who value their safety and their property.
Call 905.318.1242 or visit actionpest.ca to book your inspection today.
