Seasonal abundance of Musca vitripennis (Diptera: Muscidae) on Terceira, Azores

Data from pyramid and electrocuting traps as well as records of Musca vitripennis Meigen interceptions on cargo aircraft indicate that M. vitripennis adults reach peak abundance on Lajes Field, Azores, from mid-August through mid-October. Disinsection of military cargo aircraft and other quarantine actions to prevent accidental movement of flies from the Azores to airports in the United States are required during this period.