Why are my lemon tree leaves curling?

[ccheong]

Ive read some useful posts but wanted to verify why the leaves are curling and what pests are causing them, to ensure im using the right stuff, and what should I use.

Can you shed some light based on the photos? These are fairly young plants. Many thanks for your help.

[MitchellMc]

Welcome to the Bunnings Workshop community @ccheong. It's great to have you join us, and many thanks for your question about citrus leaf curling.

Silvery lines or trails on the new leaves mean your plant has citrus leafminer, and another indicator is the curled leaves. Use Neem oil and ensure to coat both the top and bottom of the leaves. Repeat the process every other week until no sign of insects is present.

Note, the affected leaves will not change but new growth shouldn't be effected.

Please let me know if you have any questions.

Mitchell
 

[ccheong]

Thanks so much Mitchell for your quick reply. Can I check that the Eco-neem oil I already have from Bunnings, put it into a spray bottle with some water?

[ccheong]

ANother question actually, should I spray all the leaves or only the ones affected? How often should I spray as well?

Many thanks

[MitchellMc]

You should spray all leaves, @ccheong. Eco-neem is fine, and a spray bottle with water is perfect. Spray every two weeks until there are no longer any signs of insects.

Mitchell

[ccheong]

Much appreciated Mitchell... what a great forum this is!!!

[gazzer]

 

[EricL]

Hello @gazzer 

Welcome to the Bunnings Workshop community. It's sensational to have you join us.

Thanks for the photo! From what I can see, your lemon tree’s curled leaves and the dark patches could be signs of aphid or scale insect activity. These pests suck sap from young shoots, causing leaves to curl, and their secretions often lead to sooty mould. A good first step is to gently check under the leaves and along the stems for tiny insects or sticky residue. To treat it, try OCP 750ml Ready to Use Eco-Insect Killer, which is a ready-to-use insecticide. It’s suitable for citrus and safe around edible plants. Spray thoroughly, especially on new growth and the undersides of leaves. 

Follow up weekly if needed. Also, prune any heavily affected shoots to help the plant bounce back. Keep your lemon tree well-watered and mulched, and consider feeding it with something like Yates Dynamic Lifter Organic Plant Food to support healthy growth. A strong plant is less likely to get stressed and attract pests.

If you need further assistance, please let us know.

Eric