Corky bark elm tree

Can anyone tell me why my corky bark elm is yellow on the leaves. I live in Queensland Australia. Its autumn/fall here our temps are still high 20s to low 30s degrees C. Am i over watering or under watering. I have noticed ants in the soil may be a nest



Looks too wet. We’ve had a nice wet winter and my cork oak started looking like this on consecutive rainy days.

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It is early fall so you might also be starting to see some fall color as the daylight length decreases.

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Looks pretty normal to me. The pattern of yellowing leaves seems to be the oldest growth still on the tree. Its normal for it to yellow and drop eventually.

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