Flea beattle enemies include microscopic braconid wasps, beneficial soil-dwelling nematodes, and a tachinid fly.
Nematodes are effective for the larvae of flea beetles which are small, whitish, delicate, cylindrical grubs. You can purchase predatory nematodes from a number of sources.
Microctonus vittatae is a native braconid wasp found more commonly in the eastern half of the U.S. M. vittatae not only kills the adult flea beetle as the wasp emerges, but the larval wasp sterilizes the female flea beetle while developing in her body.
Floating row covers or other screening can exclude the beetles during seedling establishment. However, remove row covers before the flowering stage to allow pollinating insects access to the plants.
Vacuum beetles off leaves.
Kaolin Clay products
http://www.practicalfarmers.org/pdfs/Beetle%20Control%20in%20Eggplant%20(2012)%20.pdf
Plant a highly favored crop such as radish before you plant your main crop, in an effort to attract flea beetles away from the main crop. Adult flea beetles will be attracted to the tallest, earliest crops available.
Once beetles are actively feeding in the trap crop, they can be sprayed with a labeled insecticide, treated with nematodes to kill larvae or simply harvested to deprive larvea of food.
Disperse radishes around the garden. Flea beetles favor radish leaves. They usually cause only minor leaf damage, but the harvestable root is unharmed and the flea beetles leave the adjacent plants alone.
Some useful plants.
http://new-self-sufficient-living.com/wp-content/uploads/2012/01/pest-control-chart.pdf
http://www.gardentoad.com/companionplants.html