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What is Myrtle Rust

Myrtle rust affects members of the Myrtaceae family, which includes New Zealand Christmas Bush, New Zealand Myrtle, Swamp Maire, and Eucalypts. Young plants and soft new growth are most likely to be infected.

 

Symptoms

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

  • Eucalypts
  • New Zealand Christmas Bush
  • New Zealand Myrtle
  • Swamp Maire


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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

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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.