Answer: The ants are there because the fruit tree is a source of food for them. Fruit trees exude a sticky sap which is like candy to the ants. Ants are also attracted to aphids so check the tree thoroughly for aphids. If they're present, insecticidal soap will take care of them. The ants won't harm the fruit tree but they may discover the fruit and start feeding on them, as well. If you periodically flood the area where the ants are living, they may move on. Or, you can use boric acid baits (poisonous only to the ants). Best wishes with your fruit tree.
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