Fly Parasites control flies in animal manure accumulations and other filth fly breeding sites. Very effective against; the housefly, biting stable fly, garbage fly, and the lesser housefly, which make to 95% of flies. Control is less complete on; the false stable fly, face fly, flesh fly and horn fly, since they complete their life cycle widely dispersed in pasture. Fly Parasites do not bite, sting, swarm or bother humans, or animals. Fly Parasites are nocturnal and are rarely seen during the day. They operate at depths up to 8 inches in the manure, honing in with their biological radar on fly larvae that are about to pupate.