Plea to report myrtle rust

Report all signs of myrtle rust.

New myrtle rust finds in the Waikato have prompted a reminder to report sightings.

The discovery of myrtle rust infecting two mature trees in Otorohanga has prompted a reminder from Waikato Regional Council to report sightings of the disease.

The Ministry for Primary Industries (MPI) briefed the regional council on the new finds and its planned response overnight.

"We've been told the fungus has likely arrived in Otorohanga on the wind," said Patrick Whaley, the regional council's integrated catchment services manager.

"With so many treasured myrtle species in our region it's really worrying to have this disease confirmed, so we've offered for our biosecurity officers to work closely with MPI to help as directed," he said.

He said myrtle rust symptoms will have been dormant over winter.

"So with the arrival of spring it's the right time for our communities to be on the lookout again for myrtle rust, as its symptoms will be more obvious. It's also important that anyone who planted myrtle species in autumn and winter starts checking them for signs of myrtle rust as the weather warms up," he said.

Myrtle rust appears as bright yellow and powdery eruptions on the underside of the leaf if it's a young infection, and on both sides of the leaf if it's a more mature infection. Other symptoms include brown/grey rust pustules on older lesions.

Anyone who spots what they think is myrtle rust should not touch or try to collect samples, but instead call MPI's hotline on 0800 80 99 66.