Flea beetles overwinter as adults in leaf litter, weeds and other sheltered places, then emerge in spring and begin feeding. They are especially attracted to seedlings and young plants, chewing numerous tiny holes that give leaves their characteristic “shot-hole” appearance. Heavy feeding can stunt or kill seedlings before they have enough leaf area to recover. Once plants are established and growing strongly, they can usually tolerate flea beetle feeding and grow through the damage.

How to Fix It
Protect young plants: Use insect netting or floating row cover immediately after planting or emergence. This is most important while plants are small.
Let established plants grow: If an older plant is healthy and growing vigorously, don't panic over a scattering of flea-beetle holes. It can usually outgrow the damage.
Remove hiding places: Clear weeds and old crop debris that provide food and overwintering shelter.
Crop rotation: Move susceptible crops to reduce exposure to beetles emerging from the previous year's crop area.
Trap crops: Radishes and other highly attractive plants can be used to draw flea beetles away from the main crop.
Kaolin clay: A coating of kaolin clay can discourage feeding. Reapplication may be necessary after rain.
Peppermint: Garden911 field experience has found peppermint useful for discouraging flea beetles. Grow peppermint nearby or try it as a repellent around vulnerable young plants.