Environmental officials have found Myrtle Rust for the first time in New Zealand, in a nursery in Kerikeri.
Growers are urged to report any signs of the yellow fungus that can kill pohutukawa, rata, mānuka and other plants in the Myrtle family.
It normally attacks soft, new leaf growth.
At the moment the disease is being contained at the nursery.
Officals say Myrtle Rust can arrive in any part of the country so it’s important members of the public remain vigilant.
The local honey industry is also watching with concern at the possibility of the plant disease devastating native manuka.