![]() In addition, agitated wasps, even while dying, typically release alarm pheromones that are chemical signals detected by other nearby wasps and induce aggressive behaviour. If it does not feel threatened, it should not sting. The best reaction? Stay calm and gently shoo the wasp away. The sting itself usually only produces minor pain, however a medical professional should be consulted if any symptoms more serious than local swelling and mild pain occur. Unlike honeybees, which can only sting once due to a barbed stinger, wasps can sting multiple times. The usual response of swatting to the insect invader may provoke a defence response in the wasp in the form of a sting. Other likely situations where an encounter occurs are at cleanup time as they may be inside empty pop cans, poking around in poorly-tied garbage bags or in the immediate proximity of fruit trees, especially in the fall. The workers, out searching for food sources for the colony, are attracted to meats and sweet beverages, typical fare at a summer barbecue. Most people typically encounter yellowjackets when they are outside having a meal. While yellowjackets are capable of stinging in self defence, the level of terror expressed by the average picnic-goer is usually far in excess of the danger they represent. While there are many wasp species in the Edmonton area, most are non-colonial, do not construct paper nests and generally do not (or cannot) sting. Yellowjackets are wasps belonging to the genera Vespula and Dolichovespula.
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