Ants, not so much. Aphids, on the other hand, love eggplant. And aphids are an ant's favorite prey, so having one tends to attract the other. Check for tiny green bugs, often smaller than the ants, in the blossoms or on the undersides of leaves. If you find them, try hitting any affected area with a weak soap solution. Just a tablespoon of Dawn in the bottom of an old Windex bottle full of water will be enough. It'll smother both ants and aphids without harming the plant. For next season, you can try a companion planting trick: plant chives, onions, garlic, or anything in the allium family near your eggplant to ward off both aphids and ants.
