Answer: I don't think the ants had anything to do with your oak trees' distress, unless you killed the ants with some powerful chemical. If you did not try to get rid of the ants and they left on their own, they had nothing to do with your oak tree's behavior. Oaks are resilient trees. Yours may be reacting to some winter stress and once it overcomes whatever stress it endured, it should leaf out for you. It will just take some time. Best wishes with your oak tree!
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