Parasitic wasps on house fly pupa. Some of these species can be obtained from commercial suppliers . Typically, the wasps are shipped as parasitized fly pupae. Upon receipt, these fly pupae are scattered in areas where pest flies are breeding. Wasps emerging from the parasitized pupae then move out to nearby areas to attack the native fly population.
Suppliers recommend regular releases of wasps every few weeks.
Release of these parasites, by itself, is unlikely to provide effective fly control. Use of parasites is intended as only one part of an integrated pest management program that includes judicious use of pesticides and a regular program of sanitation to remove breeding sites for flies. His completed website will provide detailed information on the distribution, biology, and host records of parasitic wasps that are natural enemies of pestiferous flies. It also will include an illustrated, online key with accompanying glossary, for use in identifying these wasps to species. A brief summary of wasps sold commercially for fly control is provided the table below.