Beech - Fungal Issue? Or Insect?

Hi all,
First off this beech was attacked by white aphids. Now I think it has a fungal issue, but not really sure. As you know, we’ve had a wet and cold northwest spring. It looks and seems fungal to me. I sprayed with an anti fungal about two weeks ago, and it only got worse. The leaves at the apex complete came off. Now the rest of the tree is slowly fading…

Any insight or suggestions?

Might be something else. What was your watering schedule? Beech are water loving species.
Your tree looks like it had a lot of foliage to the amount of roots in that pot.
Roots and foliage are a “mirror image”
Along with watering, the sun and wind could have played a roll.
Just my thoughts