A suspicious blaze that destroyed 200ha of scrub, bush and forestry on the Pouto Peninsula also wiped out vulnerable indigenous flora and fauna.
Helicopters yesterday spread fire-retardant substances on western areas of pine trees as a precautionary measure against the now-contained 200-hectare fire.
A Department of Conservation spokesman, David Mules, said a skeleton crew had monitored the fire overnight Wednesday, but about 80 people were back there yesterday and diggers and bulldozers were continuing to firebreak the area.
A change in the wind pattern had given an opportunity for the preventive work, deemed necessary because of the hundreds of hectares of pine forest along the west coast of the peninsula.
Three helicopters would return to dampening down hot spots once the fire-retardant spreading had been completed.