Abstract
Based on head counts of beef cattle examined in different areas of the state, the number of face flies, Musca autumnalis De Geer, was observed to be higher east of the Missouri River in South Dakota than in the west. West of the Missouri the fly was uncommon or absent during 1977 and 1978 with the exception of the Black Hills area where there is evidence of an isolated population. Pyramid traps constructed of plywood, painted white, covered with transparent plastic and coated with Tack-Trap® adhesive were placed near herds of beef cattle on each of 5 farms in Brookings Co. Over 99% of the 2049 flies caught from June through November, 1978 were males. On one farm near Brookings, house flies, Musca domestica L., outnumbered face flies by 8:1 and over 25% of the house flies attracted to the pyramid traps were female.
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