Grubs feed on grass roots, adults feed on a variety of plants. Grubs feed on grass roots leaving brown patches of lawn. Hand pick adult beetles. Keep the garden clean. Raise the pH of the soil.
Larkspur is toxic to the beetles, so plant some nearby.
Geraniums and smartweed repel the insects. Use commercial traps. Punches holes in leaves, stems and fruit, sometimes defoliating plants. Keep the garden clean and free of debris. Wrap stocking strips around stems to discourage adults from climbing stems or laying eggs.