Hand removal if a minor infestation. Doing so with care as if you bump the plant they beetle will jump off in the soil.
Incorporate yellow sticky traps to monitor your garden population.
Try to ensure seedlings grow and become established quickly. Older plants are more resistant to the damage.
Floating row covers are perfect for covering seedlings until plants become established enough to withstand the damage.
Cultivate the soil around the plant to expose pupa and fallen beetle to wildlife to feed.
Keep the growing media damp and moist as the beetles prefer a dry environment.
Clear away fallen leaves and cultivate around the plant to remove hibernation opportunities for the beetles.
Neem oil, or homemade insecticidal soap, can be sprayed onto the leaf surfaces. Make sure to follow guidance for neem oil and to test treat before applying to the whole plant.
If available, beneficial nematodes watered into the soil media will attack the larvae that develop in the soil. This will rid of the pests attacking plant roots, and reduce the number that develops into adults.
Alternatively, Flea Beetles are eaten by ladybugs and predatory wasps. Attract beneficial insects into your own green spaces by planting an array of indigenous plants, incorporating bug hotels, or just by letting some areas grow a little wild!