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How to treat marks on Eucalyptus leaves?

Hi everyone,

I hope you're all doing well.

I have a question regarding our eucalyptus tree. Over the past 4-5 months, we've noticed some unusual marks on the leaves. Can anyone help identify what disease this might be and suggest how we can treat it?

Thank you.

Ben

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Comments

JacobZ

Hi @BenB,

Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.

I can't say I'm sure what the issue is.

It's possible that it could be a fungal problem such as anthracnose, which can be treated with a copper-based fungicide such as Yates Liquid Copper Fungicide.

It could also be related to watering. Have you had a lot of rain, or very little rain lately? Is the soil around the base of the tree dry or damp?

Did anything around your eucalyptus tree change in the last 4-5 months that may have caused stress to the tree? Did you change your watering habits? Did you notice any pests or insects that weren't there before?

You might like to read through How to diagnose a sick plant for some other tips.

Also, allow me to tag @Noelle, our resident horticultural expert to see if she has any thoughts.

Let me know if you have any other questions.

Jacob

Noelle

Hi @BenB

It resembles water stress - either too much or too little - but it's a bit hard to diagnose with any certainty from just one image of a few affected leaves. What do the undersides of these leaves look like? Is it just on older leaves or are new leaves showing similar markings?

To be able to assist more, it would be good to know your location, soil type and what your weather has been like over the past 6 months.

BenB

https://www.workshop.bunnings.com.au/discussion/comment/42223#Comment_42223

Hi @Noelle and @JacobZ

Thank you for your response.

@Noelle , both sides of the leaves look like this.

Mostly, old leaves have these marks. I have attached more photos for your review. It is located in Perth.

Thanks in advance

Noelle

https://www.workshop.bunnings.com.au/discussion/comment/83321#Comment_83321

Hi again @BenB

If it's mainly the older leaves, then I think the tree will be OK. The older leaves of eucalypts may often look like this as they age and prepare to drop. So long as the younger leaves are in good condition, then I would not be too concerned.

BenB

https://www.workshop.bunnings.com.au/discussion/comment/106548#Comment_106548

Hi @Noelle

Thank you again for your comment. I took a closer look at the tree today and noticed that some of the young leaves have marks. Should I be concerned about this?

Thank you

EricL

https://www.workshop.bunnings.com.au/discussion/comment/120501#Comment_120501

Hello @BenB

Can you please take a photo of the top and bottom of the young leaf so that we can have a closer look. Also please take a photo of the most infected young leaf you can find. This will help us with the diagnosis of your plant.

Eric

Noelle

https://www.workshop.bunnings.com.au/discussion/comment/129072#Comment_129072

@BenB

Detailed photos would be very helpful

BenB

https://www.workshop.bunnings.com.au/discussion/comment/134499#Comment_134499

Hi @Noelle and @EricL

After closer inspection, it looks like the most of young leaves are doing well. As you can see in the photos, the top part of the trees is healthy and green, but the bottom part and older leaves are infected. Will the lower section recover over time?

Thanks

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/138018#Comment_138018

Thanks for those additional photos, @BenB. As you mentioned, the new leaves look quite healthy and have fresh growth.

Hopefully, @Noelle might have some more thoughts, or it might just be a wait-and-see type deal.

Mitchell

Noelle

https://www.workshop.bunnings.com.au/discussion/comment/140394#Comment_140394

HI @BenB

Have to agree with @MitchellMc. As the younger leaves look reasonable I would not be too concerned about the older leaves - they will drop as they age anyway so if it's a cultural problem (eg watering or some other similar cause) the rest of the tree will not be affected.

I'd be inclined to play the 'wait and see' game.

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