in a 2001-2005 eu funded project called leurre, european researchers succeeded in influencing cockroach swarm behaviour by using small robots that released [cockroach] sex pheromones.
read more or listen to a talking robots podcast with josé halloy, unit of social ecology at the french free university of brussels. german spoken videos on technology research using cockroaches - part [ 1 ][ 2 ][ 3 ][ 4 ].