Auckland Council has voted to close all forested areas of the Waitākere Ranges Regional Park - the strongest move yet to stem the spread of kauri dieback in the region.
The council will also close high-risk tracks in the Hunua Ranges Regional Park, on the southeast corner of Auckland, even though it is free of the disease.
Mana whenua, local boards and others affected still have to be consulted.
Officials told councillors that current measures were not working, and people are ignoring the rahui or ban that is in place.
Beaches and pasturelands will remain open in Waitakere, but the closure affects most of the park.
Mayor Phil Goff says kauri dieback is one of the most important issues the council faces.
He says he doesn't want to have to explain to his grandkids that he didn't do anything to save a species like kauri.