The poisoning of a row of pohutukawa trees in a bay near Kerikeri has now been referred to the police.
Pohutukawa along the beachfront at Opito Bay have been ailing for some time but it was only in late November that residents discovered the roots were riddled with drill holes.
An arborist who inspected the trees on November 28 determined they had been poisoned and would almost certainly die. At least four trees are affected. A number of dead branches have already been removed.
The attack outraged residents in the small beachside community, many of who are descended from the landowner who planted the trees on what used to be a bleak, shadeless shoreline.