Cockroaches are social insects that usually live in groups. Cockroaches emit pheromones that leave chemical odors in their feces and on their bodies. These pheromones serve as means of communication for the insects. The odor of the pheromone causes the roaches to cluster together in a harborage area.
Over the past few months, my family has been absolutely disgusted because of the pest problem. We have pest controlled the whole house twice but cockroaches seem to come back after a week or two. That makes me think why are cockroaches so hard to kill?
The following video might be of some help-
