For the last two years, every time I plant eggplants, ants seem to find them and invade either the top of the fruit or the corners of new leaves as they emerge from the stalk. I figured they are sucking the sugars. I have used powdered as well as liquid spinosad, and orange oil mixed with liquid molasses. They work for a couple of days but then the ants come back and have not been able to harvest my usual eggplants. Do you have any other ideas how to get rid of the ants?