kauri die back.

Tāne Mahuta, is the biggest kauri tree alive, in the Waipoua Forest of Northland, New Zealand
Tāne Mahuta is a giant kauri tree in the Waipoua Forest of Northland Region, New Zealand. Its age is unknown but is estimated to be between 1,250 and 2,500 years. It is the largest kauri known to stand today. It is named for the Māori god of forests and of birds (see Tāne). Other giant kauri are found nearby, notably the three sisters. Tāne Mahuta is the most famous tree in New Zealand, along with the three sisters. It was discovered and identified in early January 1924 when contractors surveyed the present State Highway 12 route through the forest. In 1928 Nicholas Yakas and other bushmen, who were building the road, also identified the tree.

During the New Zealand drought of 2013, 10,000 liters of water from a nearby stream was diverted to Tāne Mahuta, which was showing signs of dehydration.
In 2018, the tree was threatened by kauri dieback, a generally fatal disease which has already infected nearby kauri trees. DOC initiated a plan to protect and save the tree from kauri dieback