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?

 

[SeanKroll]

Herbicide?
Construction impact?
New irrigation?
Flooding?
Drought.
Local oak pathogens?





Oxford University Press › academic › ...
Web results
Phytophthora cinnamomi Involved in the Decline of Holm Oak ...

Phytophthora cinnamomi Involved in the Decline of Holm Oak (Quercus ilex) Stands in Southern Italy

Abstract. During a survey of forest stands of holm oak (Quercus ilex) in the Salento peninsula, Apulia region (southern Italy), the oomycete Phytophthora cinnam

academic.oup.com

 

[Naturarbo]

All new to me.This pathogen Phytophthora ramorum could also produce similar results?

 

[SeanKroll]

Ramorum is implicated in Sudden Oak Death.

 

[Naturarbo]

tomorrow going back to the tree to look for trunk bleeding and/or cankers.
Loading more pics later