Kauri dieback is a forest dieback disease of the NZ native Kauri trees (Agathis australis) caused by the a filamentous fungus-like (oomycete, oomycota) pathogen Phytophthora agathidicida. Signs include rotting of the roots and a collar around the base of the tree, resin seeping from the trunk, and yellowing of the leaves, followed by extensive defoliation and ultimately the death of the tree.