Kauri dieback report 2017: an investigation into the distribution of kauri dieback, and implications for its future management, within the Waitākere Ranges Regional Park

Author:
Lee Hill, Nick Waipara
Source:
Auckland Council
Publication date:
2017
Local boards:
Waitākere Ranges

A report on the 2015/2016 kauri dieback surveys and management within the Waitākere Ranges Regional Park.

Lee Hill (Senior Biosecurity Advisor, Kauri Dieback Disease)

Rebecca Stanley (Curator, Auckland Botanic Gardens)

Christina Hammon (Biosecurity Information Analyst)

Dr Nick Waipara (Principal Advisor, Biosecurity)

Key findings:

  • The Waitakere Ranges Regional Park (WRRP) now represents the most heavily kauri dieback infected area currently recorded in New Zealand. The recorded distribution of kauri dieback relative to kauri area within the WRRP has risen from 7.9% infected and a further 2.7% possibly infected in 2011 to 18.95% infected and a further 4.65% possibly infected in 2016.
  • Of the distinct areas of kauri forest within the WRRP which are above 5ha in size, 58.3% are exhibiting symptoms of kauri dieback infection within them to some degree.
  • The highest risk vector for Phytophthora agathidicida movement into new distinct locations is soil disturbance associated with human activity e.g. visitor tracks, baitlines and informal routes.
  • Phytosanitary stations must be upgraded to the most effective models available (the spray bottle and brush station is superseded).
  • Compliance with some form of phytosanitary procedure must increase if we are to prevent kauri dieback spread.
  • Kauri protection zones, as they are currently operated, have not slowed the rate of expression of kauri dieback symptoms.

Version 2: update June 2017

Last updated: 2017-08-22