happens both in irrigated yard and non-irrigated yard
There are a handful of fungal diseases, or parasitic issues with white oak trees. They tend to be rather hearty and resistant to disease, however the link below gives a number of of potential issues.
The fungus that I found to most closely match your question is Anthracnose. It is a fungal disease which causes leaves to droop and fall off early.
this is a photo of a white oak infected with Anthracnose
[img_assist|nid=178549|title=White Oak Disease|desc=|link=none|align=left|width=100|height=66]
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