Second image as mentioned.

Do you realize that you posted this to the Hosta forum?

In any case a quick google search shows defoliation is usually done by Pociana caterpillars or Snowbush caterpillars. Check the link below.

Have you watched "The Flame Trees of Thika"?

Steve

Here is a link that might be useful: Florida State Horticulture

Thanks for the response. I've recreated this post in the trees forum to try and get more accurate help.

Also I'm in Australia and according to the document that you linked the caterpillars in question only occur near the US. Bit far away.

I'm not familiar with Australian geography so I don't know where Queensland is exactly, but you may have missed this part.

This caterpillar has been released as a biocontrol agent for management of Jerusalem thorn in northern Australia where the plant has become an invasive weed species.

These caterpillars are essentially cutworms that defoliate trees. It may not be the cause but it's worth checking. A contact insecticide on the tree base or a sticky band will stop them. Good luck.

Steve

Well,Poincianas only grow in Florida,and other sub-tropical regions of USA. Key West has some magnificent ones,but this is still the hosta forum. Sorry! Phil

Yes its a hosta forum, but how great that someone from Australia stumbled in. Hope you will plant a hosta and come back to tell us about it - I don't think we have any fans from 'down under'.
Jan