A series of field experiments were conducted to examine diurnal activity and host location behavior of Pseudacteon curvatus in Alabama. Pseudacteon curvatus, a parasitoid of Solenopsis fire ants, were observed to be most active in July and August and to have a bimodal diurnal pattern. Pseudacteon curvatus were more attracted to fire ants at a colony disturbance (whether it is a mound disturbance or a nonnestmate disturbance) rather than to fire ants on a foraging trail. While phorids were attracted to nonnestmate disturbances, attraction was not enhanced by increasing the number of nonnestmates introduced. Pseudacteon curvatus were differently attracted to colony disturbances with and without interactions. The flies were least attracted to a mound disturbance alone. They were more attracted to a colony disturbance where an electric shock has been applied to the fire ants as opposed to a disturbance where there was a conspecific interaction but the difference was not significant.