Holm oak die back

[naturarbo]

Hi everyone this oak is browning at very fast rate for about a year. Can you tell me what is this?Southern Portugal.

How much impact can this surround have on the tree?

[Paul Cleaver]

Is it on the other side of the tree too

 

[naturarbo]

Paul is that a question?Yes is a bit less on the backside of it

[Paul Cleaver]

4 minutes ago, naturarbo said:

Paul is that a question?Yes is a bit less on the backside of it

I suspect and pest and disease problem

[treeseer]

How recent is the landscaping work on the front side?  I suspect an abiotic problem. 

[Khriss]

I would say , in Summer 2020 our H. Oak did look a bit sick , but improved after the hot spell ended. 80+ years and in raised bed near driveway , soil is compacted clay grit with full sun . No additional watering. K

[treeseer]

Looking at the last image; more like a pole at the base than a flare...has fill dirt been added?