Can they be controlled? The last two years our apricot and nectarine trees were infested by ants, ruining a lot of our fruit. I cannot find a source and am afraid to spray because of the fruit.
What Causes Ants in My Fruit Trees?
Certified GKH Gardening Expert
There are likely aphids in the trees, which are attracting the ants. It could also be they are just attracted by the juice.
I would treat the tree with neem oil for possible aphids (neem oil is organic and will not harm people, pets and beneficial bugs).
Also, to keep the ants away, either paint the trunk with a sticky substance (some garden centers will sell products for this) or wrap flypaper or reversed duct tape around the trunk. This will trap the ants before they can reach the fruit.