Wasp or hornet nest on the house

Q: Wasp or hornet nest on the house

In Canada, whether you can safely deal with a wasp or hornet nest yourself depends on its size, where it is, and who is around. A small, new, open umbrella-shaped paper-wasp nest (roughly golf-ball to fist size) under an eave or railing can often be treated by a homeowner at dusk, from the ground, with a proper wasp/hornet jet spray and a clear escape route. A large or enclosed (football-shaped) nest, a nest inside a wall, soffit, or the ground, a nest next to a door or where people gather, or any nest at all when someone in the home is allergic to stings, should be left alone and handled by a licensed pest professional. If the insects turn out to be honeybees, do not spray them — contact a local beekeeper to relocate the colony. And if anyone is stung and shows trouble breathing, swelling of the face or throat, or dizziness, that is a medical emergency — call 911.

A small, new nest under an eave is common in a Canadian summer and is often something you can handle — but a big enclosed nest, one in a wall, or any nest when someone is allergic is a job to hand off, not to fight.

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In Canada, a small, new, umbrella-shaped paper-wasp nest under an eave or railing — one you can see the cells of and reach from the ground — is the one case a careful homeowner can often treat. Do it at dusk when the wasps are calm and home, with a wasp/hornet jet spray that reaches several metres, standing well back with a clear escape route. Never do it from a ladder or with the nest above your head. If it is bigger than a fist, enclosed, or high up, stop and route it to a pro.

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warning Only at dusk, only from the ground, only with an escape routeEven a small nest can send wasps at you when you spray it. Treat only at dusk or after dark, when they are calm and home; use a proper jet spray that reaches several metres so you are never right beside the nest; and plan your way out before you start so you can walk away fast. Never treat a nest from a ladder or with it above your head — a sting or a startle can put you off the ladder. If any of that feels beyond you, this is an inexpensive, quick job for a licensed pest professional.

At dusk, from the ground with a clear escape route, treat a small umbrella-shaped paper-wasp nest with a wasp/hornet jet spray that reaches several metres. Soak the nest, back away immediately, and knock it down only the next day once no wasps are active. Never do this from a ladder or with the nest above your head.

Confirm it qualifies: small (golf-ball to fist size), open umbrella shape, reachable from the ground, and no one nearby is allergic. If any of those fail, stop and call a pro.
Wait for dusk or after dark, when the wasps are calm and back at the nest. Wear long sleeves and pants. Plan your exit before you start — know exactly where you will walk away to.
Standing several metres back, use a wasp/hornet jet spray (not a fine mist) aimed straight at the nest opening. Soak it thoroughly, then leave the area immediately — do not stay to watch.
Leave it overnight. The next day, if no wasps are flying to or from it, knock the nest down with a long pole and dispose of it. If wasps are still active, spray again at dusk or call a professional.

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Wasp & hornet jet sprayA pressurized jet-spray (not a mist) that reaches several metres, so you can treat from a safe distance — sold at Canadian Tire, Home Depot Canada, Rona

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Homeowner use of a consumer (domestic-class), PMRA-registered wasp/hornet spray on a small accessible nest is generally allowed across Canada; follow the label, which is the law for pesticide use. If the insects are honeybees, do not treat them — contact a local beekeeper to relocate the colony (killing managed or wild honeybees is discouraged and, for registered hives, may be restricted). Confirm the current provincial rule.

visibilityHow to tell what you're dealing with — from a safe distance

Watch from well back — several metres, or through a window. Never stand under a nest to study it. Binoculars or a zoomed phone photo let you look closely without getting close.
Read the nest shape. An open, downward-facing comb of visible six-sided cells on a short stalk = paper wasps. A closed grey papery ball or teardrop with a single small entrance = bald-faced hornets or yellowjackets. Insects streaming in and out of a hole in the ground, a wall, or under a step = yellowjackets nesting out of sight.
Read the insect. Slender, long-legged, dangling legs in flight = paper wasp. Fat, fast, black-and-yellow = yellowjacket. Large black-and-white = bald-faced hornet. Fuzzy, rounded, golden-brown, especially in a hanging cluster or entering a wall = honeybees.
If they are honeybees, stop — do not spray. Contact a local beekeeper or beekeeping association to relocate the colony. For anything large, enclosed, in a wall or the ground, by a door, or if anyone is allergic, route to a licensed pest professional.

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A large enclosed nest or one inside a wall, soffit, or the ground can hold hundreds of yellowjackets or hornets that swarm together to defend it. Home sprays do not reach or kill a colony that size, and disturbing it — spraying, poking, plugging the hole, or hitting the wall — provokes a mass attack that can deliver dozens of stings in seconds. Keep people and pets away from the area and have a licensed pest professional treat it. Never plug a wall or ground entrance; trapped wasps will chew a new way out, sometimes into the house.

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When someone in the home is allergic to stings, a single provoked nest can become a life-threatening emergency in minutes — the risk is not worth any amount saved. And treating a nest from a ladder or overhead means a sting or a startle can send you falling. In either case this is a licensed pest professional's job. If an allergic person is stung and shows trouble breathing, swelling, or dizziness, call 911 immediately and use an epinephrine auto-injector (EpiPen) if one is available.

Vos notes accompagnent la demande — ce que vous avez vu, ce que vous avez éliminé, quand ça a commencé — pour que le pro arrive avec une longueur d’avance.

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Nous ne classons pas seulement selon la probabilité. Nous classons comme le ferait un bon artisan honnête : éliminer d’abord les causes gratuites, sûres et courantes. C’est pourquoi les vérifications peu coûteuses passent avant les réparations chères — et pourquoi tout ce qui est dangereux reçoit un arrêt net plutôt qu’un encouragement. Cet ordre existe pour vous faire économiser, pas pour vous vendre quelque chose.