What is causing this leaf disfiguring in a white oak please

[Angus 1895]

This is a coming three year old oak. Either a burr / English cross or a SWO. It looked absolutely fine 10 days ago.

It got really hot, and the tree got heavily irrigated. I also noticed some gnaw marks on the trunk, it’s not girdled.

I put a trunk protect tubing on it.

My main differential is sunburn, as some leaves shaded don’t have it. The black leaf areas crumble to the touch.

Many thanks

 

[Teeder]

Looks like the new growth got fried.
I'd ditch the black tile tube also. Tends to heat up too early in the spring, IMO.

 

[SD51555]

If it's excessively wet this year, I'd say it looks like anthracnose.

 

[Angus 1895]

It also froze a few days last week.

 

[Angus 1895]

I am seeing the lesions on many other oaks.

So either sunburn/ frost complex is suspect