What do roaches hate. According to Wiki How a mixture of white flour cocoa oatmeal boric acid and Plaster of Paris or a mixture of citrus pulp brown sugar corn meal and boric acid can help you eliminate your. Pin On Roach Killer Signs You Have Cockroaches.Small roaches in apartment. The common domestic cockroaches are the German cockroaches and the brown banded cockroaches. Instead this species carries the egg capsules on their abdomens...