Flea Beetles
Pest · Commonly affects: Eggplant, Cabbage, broccoli, and other brassicas, Radish, Arugula, Potato, Tomato seedlings
Flea beetles are tiny jumping beetles (family Chrysomelidae) that chew on the leaves of many vegetable crops, named for the enlarged hind legs that let them spring away like fleas when disturbed. They matter to home gardeners because they show up early in spring and can quickly riddle tender seedlings, which are the plants least able to shrug off the damage.
How to identify it
Adults are very small, usually about 1/16 to 1/8 inch long, with a rounded, shiny body that may be solid black, bronze, or brown, or marked with pale wavy stripes depending on the species. The surest clue is their behavior: brush a leaf and the beetles hop away instantly. Their feeding leaves a telltale pattern of small round pits and pinholes that gives the foliage a shot-hole or sieve-like look.
Damage
Flea beetles scrape and chew the leaf surface, creating many small round holes that can run together until a leaf is skeletonized; heavy feeding on young seedlings can stunt or kill them, while larger established plants usually tolerate the mostly cosmetic damage. Some species also feed on roots during their larval stage, and a few spread plant diseases, most notably the corn flea beetle, which can carry the bacterium that causes Stewart's wilt.
Prevention
Rotate crops so that beetle-favored families such as brassicas, nightshades, and root crops are not grown in the same bed year after year, and clean up plant debris and weeds (especially wild mustards) in fall to remove the sheltered spots where adults overwinter. Delaying planting until the soil and air have warmed helps seedlings grow past the most vulnerable stage quickly, and setting out sturdy, well-hardened transplants rather than direct-seeding gives plants a head start. Fertile soil and steady, even moisture support vigorous growth that can outrun light feeding, and where available, choosing vigorous or less-preferred varieties adds another layer of protection.
How to manage it
Cover seedlings and young plants with floating row cover as soon as they go in, sealing the edges to the soil so beetles cannot crawl underneath, and remove the cover from flowering crops that need pollinator access. Set yellow sticky traps near the plants and use a trap crop such as a short row of radish or mustard to lure beetles away from the main planting, or on cool early mornings knock the sluggish beetles into a jar of soapy water. Encourage natural enemies like braconid wasps, big-eyed bugs, and lacewings by keeping flowering insectary plants nearby, water beneficial nematodes into moist soil to reduce root-feeding larvae, and pull and discard badly infested seedlings that are not going to recover.
General guidance for US home gardens, focused on prevention and non-chemical control. For a confirmed diagnosis and options specific to your area, contact your local Cooperative Extension office. Page updated Aug 4, 2026.