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I have a rather large oak tree and many of its leaves are turning partially brown (it's mid-to-late July). The tree is in Northeastern Mississippi. A few of the leaves are falling off. I have other oak trees and they are not exhibiting this behavior. What might be going on? See photos below.

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  • What is happening at the base of the tree? That black netted area?
    – loppers
    Commented Jul 23, 2021 at 20:00
  • That is just a compost pile. I can't imagine how it could possibly be affecting the tree.
    – bill999
    Commented Jul 23, 2021 at 20:02
  • How is the tree doing? Did you determine the cause of the leaf discoloration?
    – YoeyYutch
    Commented Feb 1 at 2:16
  • @YoeyYutch, I asked my local university extension service and they said that they thought it was likely Tubakia leaf spot. The caveat is that that was just based on photos and not samples.
    – bill999
    Commented Feb 2 at 3:47

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The symptom is water stress, and it's likely caused by some fungal infection but there isn't really enough to say definitively what it is.

I immediately thought of Oak Wilt, Sudden Oak Death or Biscogniauxia dieback since they're the most prevalent and potentially deadly. Can you check the trunk and lower branches for any abnormal peeling bark or oozing sap? If you happen to see tiny holes, it could also be some shothole borer--but I wouldn't expect that much damage so quickly from borers.

What's in that compost pile? Any wood chips or leaves that came from further away? (If so, it could have introduced some pathogen to the nearby tree...)

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