I don't think flea beetles ever go away! However there seems to be less of them this year (at least so far). I don't know whether a wet spring had anything to do with it or maybe some early preventative spraying helped. I put some permethrin on all empty beds early in the season. You could see them scurrying! A month or two later I reapplied and so far there aren't many.
The only things that have hit the eggplant so far have been a few Japanese beetles lacing up the leaves. But the eggplant is with the tomatoes up by the house, not in the garden so that might have helped too.
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