Marking and Trapping Studies on Dispersal and Abundance of Egyptian House Flies1

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Abstract
A study was made with traps and marked flies to obtain information on the dispersal of resistant house flies from one village near Cairo, Egypt, to others in the immediate area. Phenolphthalein was used to mark 44,000 flies, 94% of which were Musca domestica vicina. 5% M. sorbens sorbens, and 1% Sarcophaga spp. Two traps were set in each of 6 villages within 1.5 miles of Tersa. Marked flies were detected by immersing collected flies in 1% NaOH solution. Of the marked flies recovered in all 6 villages 70% were caught within the first 3 days, and 81% were collected in 3 villages within 1 mile of Tersa. Dispersal of marked flies was apparently not entirely by flight. Resistant flies did migrate from the point of release to other villages in the surrounding area, but probably not in sufficient numbers to affect the resistance of the strains in these villages. In another test 10,000 marked house flies, principally M. d. vicina and M. s. sorbens. were released in Ezbet Sharawi, and it was estimated from the first day''s catch that the total house fly population in Sharawi was between 0.75 to 1 million. In all, 7.15% of the marked flies were recovered during the experiment. Daily collections were positive for marked flies until the 12th day, and one marked fly was caught on the 16th day.

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