Description of Millipedes (Diplopoda):
Millipedes, also known as thousand-leggers, are generally beneficial to the lawn due to the fact that they break down dead material that releases beneficial nutrients and creates good soil. If you are having problems with them getting from the yard into the house, keep things like mulch, stones, and other things away from alongside the foundation.
Millipedes Optimized Control Options Finder
According to the manufacturer approved labels: The following 3 insecticides, applied at the listed application rates, will control Millipedes.