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How to treat Murraya with sap on trunk and yellow leaves?

Hi there. I’m hoping you can help me. One of my Maraylas has sap on the trunk and the leaves are turning yellow. I have several Maraylas with no sap and the leaves on the others are also turning yellow. Your advice would be greatly appreciated. Have attached a photo. Thanks so much.

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MitchellMc

Welcome to the Bunnings Workshop community @liuliu. It's wonderful to have you join us, and many thanks for your question about plant care.

I must admit I'm not familiar with a plant by the name of Marayla, though it could potentially be a Murraya. I can't say I've encountered this issue before, and it doesn't seem to be particularly common as I haven't turned up any info on it through searching.

I'm going to need to call in a couple of our gardening experts, @Noelle and @mich1972, to see if they have any thoughts.

Please let me know if you have any questions.

Mitchell

liuliu

https://www.workshop.bunnings.com.au/discussion/comment/46713#Comment_46713

Thanks Mitchell for your reply. They are Murraya. Sorry for the confusion

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/85396#Comment_85396

Thanks for clarifying @liuliu.

Leaking sap is typically caused by pests like aphids or scale insects, environmental stress, or fungal infections. Check for pests on the leaves and stems, and prune any damaged branches to improve airflow. Ensure proper watering—moist but well-drained soil—and consider using a balanced fertiliser. If pests are present, try neem oil. Once stress factors are addressed, your plant should improve.

Mitchell

Noelle

https://www.workshop.bunnings.com.au/discussion/comment/85396#Comment_85396

Hi @liuliu

Sometimes sap or gum weeping from a stem is the result of an injury to the stem, either by a bug or insect or even 'mechanical' damage - accidental breakage or a cut. I would not be too concerned at this stage as it is only a small amount but have a close look to make sure there isn't a borer or similar pest present that has made a hole in the stem into which it may lay its eggs.

The yellowing is, in my opinion, unrelated to the sap exudation. It looks to me like a nutrient deficiency as the pattern on the leaves looks like chlorosis or lack of nitrogen and/or magnesium. An application of a good all purpose slow release fertiliser around each of the plants may be all that is needed to control this.

liuliu

https://www.workshop.bunnings.com.au/discussion/comment/107882#Comment_107882

Thanks @Noelle for your reply. There are other areas on the branch oozing sap and am wondering should I remove all branches that have sap?

liuliu

https://www.workshop.bunnings.com.au/discussion/comment/107881#Comment_107881

Thanks Mitchell for your advice. I will fertilise them and see how I go. Thanks again for your advice.

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/121200#Comment_121200

It doesn't sound like @Noelle is of the opinion that you should remove any of those branches and instead has suggested you check to see if there are borer holes where the sap is coming from.

Mitchell

Noelle

https://www.workshop.bunnings.com.au/discussion/comment/121199#Comment_121199

No, I wouldn't remove the branches - the 'bleeding' is not severe enough to warrant that. Check for pests and take appropriate action if you find any.

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