Fly parasites are small, harmless (to humans and animals) beneficial insects that nature has programmed to attack and kill flies when the pest is in its immature pupal stage. They are the single most important natural enemy of flies and will control most species normally present in garbage and animal manure.
The female fly parasite deposits her eggs inside the host pupae. As the tiny parasites develop they consume the contents. In about 2-3 weeks a new adult parasite emerges from the fly puparia. The new parasites then search out and kill more fly pupae. Each female fly parasite will kill about 100 fly pupae in its lifetime.
Fly parasites must find fly pupae in order to reproduce. This need provides a strong and natural incentive to do all the work: search and destroy. Since their only interest is the pest fly pupae, they will not bother humans or animals. Very effective because they kill pests before they become adults.
