MORE than 100 tonnes of Frogbit has been removed from properties around Anna Bay after Port Stephens Council uncovered the region’s first known infestation of the invasive aquatic weed.
The discovery was made during routine monitoring by the Council’s Environmental Operations Team, which quickly moved to stop the weed spreading into local waterways.
Frogbit is a prohibited weed across NSW because of the damage it can cause if it becomes established.
It grows quickly across the surface of waterways, where it can crowd out native plants, smother aquatic habitats and interfere with drainage.
The thick mats can also make deep water appear to be solid ground, creating a risk for people, pets and livestock.
Over 20 days, Council staff worked across 25 properties, treating about 9000 square metres of water surface and removing more than 100 tonnes of plant material.
Environmental Operations Team Leader Brayden Luke said finding the weed early was key.
“Early detection by our biosecurity team allowed Council to act immediately, successfully preventing this high-risk weed from establishing itself in our region,” he said.
Council has not been able to establish exactly how the weed arrived in Port Stephens, although it is believed it may have been accidentally disposed of from an aquarium.
The clean-up involved Council staff working closely with landholders to access a complex drainage network and identify affected areas.
Brayden said the cooperation of the landholders was appreciated by the team.
Council used mechanical removal as well as approved herbicide treatment. While non-chemical methods are preferred where practical, the size of the infestation meant herbicide was considered the most effective way to make sure the weed was controlled.
The work is now complete, but Council will continue monitoring the affected sites at least twice a year to check for regrowth.
Port Stephens Mayor Leah Anderson said protecting the area’s waterways was a shared responsibility.
“Our pristine local waterways and unique natural environments are what makes Port Stephens such a beautiful place to live and protecting them is an absolute priority for both Council and our community,” Mayor Anderson said.
Residents are being asked to keep an eye out for Frogbit’s small, round, glossy green leaves and tiny white flowers.
Anyone who spots a suspected plant should not disturb it, as broken pieces can spread the weed.
Sightings can be reported to Council at weeds@portstephens.nsw.gov.au.
By Althea GUINSBERG
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