Answer: What you describe sounds like transplant stress. It is not at all unusual for trees to look wilty and drop some leaves before they establish their root systems in a new home. As they adjust they will begin to perk up. The ants are probably just exploring the tree in search of nectar or honeydew (secretions from aphids). They won't pose a problem to your tree. Arbutus unedo requires well-draining soils and prefers infrequent, deep soakings. While it's recovering, water deeply once a week. This will encourage the development of a deep root system, which will allow the tree to survive droughty conditions. Best wishes with your landscape!
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