Phytophthora agathidicida
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Author(s): T. Jung, A. Pérez-Sierra, A. Durán, M. Horta Jung, Y. Balci and B. Scanu
Source: Persoonia (2018), 40, p. 192
Phytophthora agathidicida B.S. Weir, Beever, Pennycook & Bellgard 2015 - (Kauri dieback)
This pathogen is found in New Zealand and infects kauri trees (Agathis australis), large native trees which can reach a stem diameter of 5 m and a height of up to 50 m. Kauri trees are unique acient conifer trees that grow only at the northern end of New Zealand. Due to extensive logging in the past, few pockets of kauri trees remain, mainly in protected areas.
The disease was first noticed in 1972 on the Great Barrier Island, off the eastern coast of the North Island, but later also found on the North Island itself. Symptoms include thinning, chlorosis and dieback of crowns with abundant resin exudations and tongue-shaped lesions at the base of the trees. Fine roots die off and a high rate of infected trees die. Although the disease has been only noticed recently it is believed to be endemic in northern New Zealand, and is going through an outbreak cycle in the beginning of the 21st century.
For a reviews on the disease see Bradshaw et al. (2020) and Jung et al. (2018).
