How do roaches transfer the bait?
There are several ways in which cockroaches transfer bait to other cockroaches: through the eating of roach feces, roach regurgitation, consumption of dead cockroaches and their remains, and by contact. Nymphs (baby cockroaches) tend to stay in the nest and feed mainly on cockroach feces, making baits very effective in controlling the roach population. If a cockroach dies from eating roach bait, its carcass will contain enough insecticide to kill other cockroaches that feed on its remains. Dying cockroaches may also regurgitate and other roaches ingest insecticide in that way. Lastly, some insecticides, like Fipronil, can kill by contact. As cockroaches nestle together in the nest, they can transfer insecticide to one-another by contact.
