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Rust looking spots on most of the leaves of an Indian Guava (Psidium guajava)

Gardening & Landscaping Asked by Shane Gadsby on October 24, 2021

My Indian Guava (18 months) has been getting more and more rust looking spots on its leaves.

Front side: enter image description here enter image description here

Back side: enter image description here enter image description here enter image description here

  • Is this a nutrition issue? (They are given a weak fertiliser about once every 3 months)
  • A type of insect? (I couldn’t find any active bugs, and they get sprayed about once a fortnight)
  • Too hot? (Days are around 36C)
  • Too cold? (Nights are around 5C, but it lives in a greenhouse)
  • Mould? (I mould spray every month)

I found this: What are these red spots on my guava leaves? but the pics they have seem very different to mine, so I thought it would be OK to ask separately.

I rescued this plant when it was a tiny little sapling about to be thrown out by my local hardware store (Bunnings Australia), so I’ve got quite an attachment to it and would really like to figure this out.
I’ve tried so much without effect, so I’m happy to take whatever steps people recommend to get it back to health!

Thanks in advance!

One Answer

It is disease.

What is important to know here (Australia) is whether this is puccinia psidii (Myrtle Rust) because the nursery will have to be informed.

official info at https://www.environment.gov.au/biodiversity/invasive-species/diseases-fungi-and-parasites/myrtle-rust Contact details for help in Victoria at: https://agriculture.vic.gov.au/biosecurity/plant-diseases/shrub-and-tree-diseases/myrtle-rust/treating-myrtle-rust-in-home-gardens

This is Myrtle Rust on Psidium spp.

Answered by Polypipe Wrangler on October 24, 2021

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