The heavy rains experienced on Friday 15 March has led to a large saltmarsh mosquito hatch across our coastal wetlands. The eggs hatch into larvae which will take about seven to ten days to develop into adult mosquitoes. Adult mosquito activity can then be expected to last for up to two weeks (from around 25 March to 8 April). Council’s Entomologists are aware of the hatch and aerial treatments have taken place (18-20 March) across known saltmarsh breeding sites, including areas around Bald Hills, Brighton, Boondall, Brisbane Airport, Pinkenba, Fisherman and Whyte Islands, Hemmant and along Bulimba Creek, Tingalpa and Mud, St Helena and Green Islands. The eco-friendly sprays used are safe for other animals, humans and the environment but target mosquito larvae (also known as wrigglers) to ensure we catch them before they mature and disperse. Additionally, Council crews on foot, on quad bikes and in spray trucks have been working hard to address the latest hatch. To find out more about Council’s mosquito management program please see information provided below.
Brisbane City Council manages more than 2,500 known freshwater mosquito breeding sites on public land to reduce mosquito numbers. Council’s mosquito management staff inspect and treat these sites regularly using quad bikes, utility trucks and on foot.
The large saltmarsh mosquito breeding habitats in coastal areas are sprayed by helicopter with ground support by quad bike teams. In a typical season Council will treat approximately 20,000 hectares of coastal saltmarsh by helicopter.
Council treats the saltmarsh mosquito larvae in their breeding pools before they emerge with either Bti (Bacillus thuringiensis israelensis) or methoprene based products that target the larvae and are safe for other insects, the environment and humans. Bti only effects larvae for the few days before they pupate while methoprene only disrupts the pupation process. This means that there are usually only a few days available after a hatch event to successfully control the larvae with these products.
Ways Council treats for mosquitoes
Council’s control activities are scientifically managed, targeting specific areas where and when breeding is known to occur. Our program follows industry best practice and uses products designed to kill mosquito larvae without harming other aquatic life.