I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Your Live Oak tree sounds like it may be suffering from poor aeration in the roots caused by overwatering. Both a lack of water and soggy wet soil conditions can be very damaging to roots. If you put fertilizer and planting hole this can burn roots since most fertilizers or salt-based products and when concentrated are damaging to roots. Dig down a few inches into the soil and feel at to see if it is dry or wet and then water accordingly. Consider fertilizing these trees if they haven't been fertilized previously this year using a lawn type fertilizer at the right recommended on the bag for turfgrass. If the trees don't respond to this consider taking some photos to your County Extension Office for them to view and perhaps diagnose some other issue that may be going on.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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