Abstract
House flies, Musca domestica L., were collected by insect net from dairy barns in the area of Freehold, New Jersey, marked by suitable fluorescent dyes, and released in the same barns. Dispersion of flies to other barns was determined by night searches with a black light. Collections of flies from barns, traps, and fly ribbons also were used to determine fly movement. For some releases flies were reared on the farms. Over a 2-year period 9 experiments were conducted using 133,000 marked flies released at 6 locations. The studies showed that insecticide-resistant flies will move quite readily from one barn to another, moving at least a mile in a day and apparently in all directions. Flies were recovered up to 6.5 miles from the release point. Largest numbers of flies were recovered in barns where conditions seemed most favorable to flies. Reciprocal movement of flies between barns was shown in 3 instances. Measurement of the population at the release point at intervals after release indicated the size of the total fly population in these barns. This procedure permitted calculation of actual numbers of flies migrating to a given barn.
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