Garlic Pepper Spray is an effective organic method for repelling potato bugs, ants, grubs and other harmful small critters and pests. You will also want to spray this mixture around your garden perimeter to keep groundhogs, rabbits, deer and other animals.
7 Plants to Help Control Potato Bugs (and some other major garden pests). From Tipnut.com. Includes companion plantings/natural deterrents, getting rid of the bugs, and making homemade repellent teas or infusions.