Field and Laboratory Evaluation of Parasitism of the Face Fly in Virginia12

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Abstract
Experiments were conducted in the field and laboratory to determine parasitism of an exotic pest, the face fly, Musca autumnalis De Geer, and other native dung-inhabiting Diptera, Ravinia querula (Walker), Ravinia spp., and Orthellia caeserion (Meigen). Cattle droppings in the field were placed in large metal funnels, and fly pupae were allowed to fall into jars of sand attached to the bottom of the funnels. The pupae were held in the laboratory for emergence of the parasite or host. After early efforts to propagate native parasites on the face fly proved to be unsuccessful, colonies of the previously mentioned native dung-inhabiting Diptera were established to act as alternate hosts for the parasites Aphaereta pallipes (Say) and Eucoila impatiens (Say). Experiments were conducted with these 2 parasites against native hosts and face fly to determine their hostal preferences.

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