Wakatipu rocks keep lagarosiphon at bay

The rocky foreshore of Lake Wakatipu seems to be helping keep an invasive weed at bay.

Concern that lagorosiphon was spreading into Lake Wakatipu led to a survey of 240 kilometres of the lake shore this year.

However, apart from a small number of plants found in Frankton Arm and near Kingston, divers found the weed had not gained a foothold in the lake.

Members of an aquatic weed management group are however reminding the public to be careful not to spread the weed.