The Ministry for Primary Industries says it is continuing to encourage people to keep an eye out for the harmful plant disease myrtle rust and report any signs of the disease.
Myrtle rust is a serious fungal disease that affects plants in the myrtle family. Plants in this family include the iconic pōhutukawa, mānuka and rātā as well as some common garden plants such as ramarama and lilly pilly. So far in New Zealand, the infection has been mostly found on pōhutukawa (Metrosideros) and ramarama (Lophomyrtus).
MPI, in partnership with the Department of Conservation and with the support of local mana whenua and councils, has been working to manage the disease since it was first found in Kerikeri in early May this year.
Since then, the disease has been found on 123 individual properties, mostly in private gardens. The majority of these affected locations are in Taranaki, principally around Waitara, and there is a second significant area of infection in Te Puke in the Bay of Plenty. There have been small detections in Northland and Waikato that were immediately removed and there has not, as yet, been any recurrence.
In Taranaki, as part of the work to try to contain the disease, MPI has put legal controls restricting the movement of myrtle plants and plant material (for example, cuttings, garden waste) out of the Taranaki region.
To date, the focus has been on trying to contain the disease and remove any infection found. Myrtle rust eradication has never been achieved anywhere in the world and rusts are notoriously difficult to treat. The next phase in tackling this issue may be to aim at protecting specific areas and trees while developing scientific solutions around treatments and building resistance.
By learning where myrtle rust is in New Zealand, the ministry expects to make better decisions about the most appropriate way to manage it in the future.