The American cockroach, Periplaneta americana (Linnaeus), is the largest of the common cockroaches, measuring on average 4 cm in length.
Tips for eliminating American cockroaches:
In combination with the above, insecticides that are labeled for cockroaches can be applied to basement walls, wood scraps, and other infested locations. Residual sprays can be applied inside and around the perimeter of an infested structure. When insecticides and sprays are used to manage cockroach populations, they may ultimately kill off the parasitic wasps that help naturally control cockroaches. Bait stations placed strategically around the inside of the building are probably the safest and most effective option.
Find more information about pests in eXtensions Pest Management In and Around Structures Resource Area.