Monitoring of midge larvae numbers by the cities of Joondalup and Wanneroo and the Department of Parks and Wildlife showed a rise in midge activity, so the wetlands were treated on November 30.
Joondalup Mayor Troy Pickard said this aimed to eliminate future midge nuisance.
“Lake Goollelal and Lake Joondalup are important wetlands and ecosystems and every endeavour has been made to protect the animal life supported within them,” he said.
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READ NOW“The species of midge that breed in both lakes do not bite or cause any adverse health effects. However, when in large numbers midges can cause a nuisance to those living around the wetlands.
“Continued monitoring will occur and should midge larvae numbers become elevated, a secondary treatment will take place.”
Wanneroo Mayor Tracey Roberts said the cities and department had a midge management agreement, with treatment a last resort.
“There is a concern that midges may become resistant to the larvicide if overused,” she said.
“However, the lake was treated last month due to the recent high larvae numbers and swarms that were becoming a serious nuisance to the community.”
To reduce attracting the |insects, residents are suggested to use yellow low-wattage (25 or 30-watt) globes around their home and reduce lighting in external areas.
People living near lakes can help by washing their car on lawn instead of the driveway or street, use nutrient-free detergents and slow-release fertilisers on lawns and garden, plant native plants and dispose of household waste appropriately.
Residents who are sensitive to chemicals can be notified 24 hours prior to treatment of the lakes. Call the City of Joondalup on 9400 4933 and Wanneroo on 9405 5000.