Are there any natural enemies of the smokybrown cockroach?
When confined to closed spaces, skinks, fire ants, and argentine ants (often called black sugar ants) have been observed to eat cockroaches. However, when cockroaches have an easy escape route, these potential predators probably don’t have a chance trying to catch them. Lizards and ants are more likely to chase the cockroaches from their normal hiding places. There is strange little wasp that lays its eggs inside the egg cases. The larvae that hatch from these eggs devour the developing cockroach eggs. Unfortunately, this little wasp, known as an ensign wasp, is not very common and does not seem to provide a limit to the development of cockroach populations.
