Uredo rangelii

What is Myrtle Rust

Myrtle rust affects members of the Myrtaceae family, which includes pōhutukawa, rātā, mānuka, kānuka, ramarama, swamp maire and eucalypts. Young plants and soft new growth are most likely to be infected.



Can start with small purplish spots. Develops mature bright yellow, powdery spores on leaves and, sometimes, fruit. Leaves can become contorted and purplish-red pigmentation can occur. Soft plant material can die.


Plants impacted

  • Pōhutukawa
  • Rātā
  • Mānuka
  • Kānuka
  • Ramarama
  • Swamp maire
  • Eucalypts

More articles


Rust fungus is easily identified by the many orange or red pustules on leaves or stems which break open and release masses of spores.

Powdery Mildew

Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves.

Sooty Mould

Sooty mould is a fungal disease which presents as a black powdery substance coating plant leaves, stems and twigs usually accompanied by a sticky residue.

Downy Mildew

Downy Mildew is often more widespread in younger plants and is recognised by downy, whitish tufts or spores on the underside of the leaves.