Canberrans are being urged to keep a close eye out for European wasps and potential nest sites before the winter hibernation period closes in.
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Territory and Municipal Services wasp expert Dr Philip Spradbery said although wasp numbers had reached their peak, it was important to act now while queen rearing is underway as hibernation lasts until October.
“The queens are capable of producing 20,000 new queens and each one may potentially build a new nest next year,” he said. “Any nest treated now is very useful in controlling this invasive species in Canberra.”
Dr Spradbery said although locals were unlikely to see the nests themselves, there are several tell-tale signs that European wasps may have made a house or yard their home.
“What you're looking for is a hole leading into the house or in the garden and wasps flying in and out during daytime hours,” he said. “They're typically underground, such as a hole in the soil or at the base of a tree.
“Half the nests reported in Canberra have been inside the home. They've really adapted to the human habitat.”
Dr Spradbery said anyone who finds or suspects a European wasp nest on their property should call the ACT Government European Wasp Hotline for advice.
“Generally speaking, it's best to seek a professional,” he said.
“For the structure of houses, I would urge professionals to be contacted. These nests can be difficult to treat and there is the risk of the wasps retaliating. There can be 2000 adults in a nest at this time of year.”
Locals are also encouraged to report European wasp nest sightings in nature parks and other public spaces.
“This year one of the major problems is in Namadgi National Park,” Dr Spradbery said. “As the wasps are an introduced species, they could be causing untold havoc among insect life. This can have a prolific effect on the ecology of the area. In some instances they could clear out every [native insect] in an area.
“The rangers are doing a great job at locating nests and getting them treated.”
If stung by a European wasp, an ice pack to alleviate pack will suffice. However, Dr Spradbery said anyone who develops a severe allergic reaction, experiences difficulty breathing or is stung in the mouth should seek immediate medical attention.
For advice on the identification control of European Wasps, phone the ACT Government European Wasp Hotline on 6162 1914.