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Field Studies on the Resting Habits of Flies in Relation to Chemical Control

Part II—In Rural Areas

Musca domestica was the dominant species (97 per cent) observed in studies of fly resting habits in rural areas near Savannah, Georgia, 1950–1951. During the daytime hours only small percentages of the flies were observed resting on surfaces which are normally sprayed. In unscreened houses the greatest concentrations of flies during the day were found in the kitchens. Repeated all-night observations showed that flies remained in one place during the entire night.

Screens were indicated to be more than 97 per cent effective in preventing flies from gaining entrance into homes. On unscreened premises approximately 90 per cent of the flies were found resting in the houses at night throughout the year. On screened premises in cooler temperatures flies were found resting at night in barns; with slightly warmer temperatures they began moving out to porches, and as minimum temperatures approached 70°F., most of the flies were found in the lower branches of trees and on shrubs.

Residual spray applications for fly control on rural premises should include the treatment of porches, the lower portions of trees and shrubs adjacent to houses and animal shelters, barn interiors, and the ceilings and upper portions of the walls of unscreened dwellings. The high concentrations of flies at night in relatively small areas suggest the possibility of controlling flies economically by the selective application of space sprays at night.