How to identify if this is fungus?

[kathy7]

 

[MitchellMc]

The dark brown to purplish patches along the leaf edges, along with the curling and crisping, suggest either a fungal or bacterial leaf spot problem, which is common in plants like Lilly Pilly or Photinia @kathy7. However, it could also be caused by environmental stress, such as leaf burn from hot, dry winds or a recent fertiliser or spray application. If the affected areas feel soft, appear wet, or seem to be spreading, it’s more likely a fungal or bacterial issue. If the patches are dry, crispy, and mostly on exposed leaves, it’s probably sunburn or wind scorch. 

To help your plant recover, prune off the affected leaves and branches, and thin out dense growth to improve airflow. Dispose of this material in the bin and do not mulch it. Also, clean up any leaves that have already fallen around the plant. Avoid watering the foliage and instead water at the base early in the morning. If you suspect fungus, apply a broad-spectrum fungicide such as Yates Mancozeb Plus according to the directions. Once the plant starts showing new healthy growth, apply a balanced fertiliser and add a layer of mulch to support recovery.

Please let me know if you have any questions.

Mitchell

[kathy7]

Hi and thank you for your reply .I  went out and checked  the leaves  and  the dark section  on the leaves  are in fact crunchy

[JacobZ]

Hi @kathy7,

That would imply the issue is more likely due to heat than fungus.

As Mitchell mentioned, you should remove and dispose of the affected leaves and then focus on getting your plants plenty of water, ensuring it is applied to the base of the plant, not the leaves. 

Let us know if you have any further questions.

Jacob

[kathy7]

Thank you