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Didymo appears to be spreading at the top of the South Island -- the invasive weed being reported in two more rivers.
Tasman District Council environment and planning manager Dennis Bush-King said he had been alerted to two new finds of didymo (didymosphenia geminata) in the Buller River catchment.
He declined to say in which rivers the pest, commonly called "rocksnot", was found.
Biosecurity New Zealand spokesman Phil Barclay said his organisation had not been notified of any further finds.
Didymo was first identified in Southland in October 2004, and was found in the Buller River 11 months later. It has also been found in the Gowan River and the upper Takaka River -- close to the internationally renowned Te Waikoropupu Springs, near Takaka in Golden Bay.
- NZPA
