Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:14:23.3606022Z
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Myrtle rust (476)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. In Australia, New Caledonia, New Zealand.
  • Serious fungal disease of Myrtaceae causing spots, distortions, defoliation, dieback and death depending on species. Major threat to native environments.
  • Pustules (uredinia) on foliage and flowers, sometime purplish borders, producing masses of vivid yellow spores (urediniospores); occasionally, another thick-walled survival spore (teliospores) forms in the pustules on underside of leaves.
  • Spread: spores on the wind; rain splash; on clothing, vehicles, animals, and the trade in wood and live plants.
  • Biosecurity: difficult because wind dispersed, but regulation of movement of plant hosts important.
  • Cultural control: regulate plant nurseries; avoid replanting susceptible species; hygiene measure (clothing, tools, vehicles) avoiding transfer of spores to healthy areas.
  • Chemical control: strobilurin and sterol biosynthesis inhibitor (SBI) fungicides registered in Australia. Copper and mancozeb fungicides also likely effective.

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