The initiative, aimed at managing Lagarosiphon, is part of Toitū Te Whenua Land Information New Zealand’s (Linz) annual biosecurity programme.
Linz biosecurity manager Tracey Burton explained divers would hand cut the invasive weed in targeted areas, focusing on boat ramps and swimming zones to ensure continued enjoyment of the lake.
"This work builds on efforts from late last year to help maintain the lake’s accessibility for summer users."
Lagarosiphon, a fast-spreading aquatic plant known to disrupt waterways, out compete native species and affect recreational activities.
"It’s critical that we keep it in check to protect both the environment and how people use the lake."
The control work is expected to take about two weeks, wrapping up by the end of this month.
Linz encouraged lake users to help prevent the spread of aquatic pests by inspecting, cleaning and drying all equipment.
"We must be more vigilant than ever in our inspections," Ms Burton said in a statement.
"While Lake Dunstan is already affected by Lagarosiphon, we need to protect it from other freshwater pests, such as New Zealand’s worst submerged weed, hornwort, and other pests like the gold clam currently only in the North Island."
Linz is collaborating with local groups, mana whenua and the community in these biosecurity efforts.
This includes the Lake Dunstan, Lake Wānaka and Lake Whakatipu aquatic weed management committees, which are led by Linz.
