If you have roaches in one room you probably have them throughout your home. You can use plain corn meal. Put 1/2 teaspoonful in each crack and every corner of cabinets and drawers.

You'll never seal the room enough

im gonna tape every single hole i find, and then put some repellents in there, as well as roach baits, i plant on using essential oils for this. will they die from the repellent or from no food?