Every Spring around the first of May, my garden gets an infestation of flea beetles which chew those tiny pin-holes in my arugula, mesclun mix, radishes and other such greens. I've tried row cover, but it heats up the bed so that my crops bolt too early. Last year I resorted to using a rotenone/pyrethrum spray, but I really don't want to do that again as it will kill beneficials as well--though it is organically acceptable. Has anyone tried using a hand-held vacumn cleaner on the little beasties? Ideas anyone??