Ants may be attracted to the fruit on your trees. Actually, they are likely attracted to the honeydew extractions that aphids, mealybugs, scales, whiteflies or other plant-sucking insects leave behind. These insects may be causing the most trouble for your fruit trees, and the ants are compounding the problem by scaring away the natural enemies of these other pests. Therefore, if you keep ants off your fruit trees, it helps you control the aphids and other plant-damaging insects.
Wind Teflon or fabric tree wrap around the tree trunk, about 2 to 3 feet from the ground. It should be snug around the tree so that ants cannot go under it. Some wraps are actually tapes, but if yours is not secure it with duct tape. The wrap should be about 12 to 18 inches wide. Look at your local nursery or online for these products.