Flea Beetles :there are several organic controls:
Trap crop:Southern Giant Mustard (Brassica juncea var. crispifolia), or, interplant radishes—'Chinese Daikon' and 'Snow Belle'.
Botanical pesticides used for controlling flea beetles include neem, rotenone, pyrethrin, sabadilla, and formulations of these in some combination.
Insecticidal soap as an organic option for flea beetles seems to be only moderately successful.
Garlic sprays are useful, as are intermixed plantings of onion , garlic, and members of the mint family.
Diatomaceous earth has been observed to reduce flea-beetle populations, but does so gradually and slowly due to perforations of the beetles exoskelitins (chitinin).
Perhaps a combination of insecticidal soap (surfactant) along with the diatomaceous earth (rupture exoskeletins) would work out well.
Yes, I am planning on trying out the Diatemateous Earth and Garlic/pepper spray, since we are supposed to have a few rain-free days in a row.
Great fleas have little fleas upon their backs to bite ‘em,
And little fleas have lesser fleas, and so ad infinitum.
And the great fleas themselves, in turn, have greater fleas to go on;
While these again have greater still, and greater still, and so on.
AugustusDeMorgan, in “A Budget of Paradoxes”