Abstract
Several thousand phosphorous32-and fluorescent-marked stable flies (Stomoxys calcitrans (L.)), several hundred horn flies (Haematobia irritans (L.)), and house flies (Musca domestica L.), and several thousand mosquitoes (Culex tarsalis Coquillett, C. peus Speiser, and Aedes dorsalis (Meigen)) were released in Lake County, Oregon, in September 1961. Labeling was efficiently accomplished by placing P32 in the diet of the insects at the rate of 1 microcurie/ml. Marked stable, house, and horn flies were recovered 1 and 5 miles from the release site. Activity of mosquitoes was apparently curtailed by low nightly temperatures since none were caught. The stable flies showed the most rapid dispersion with specimens being recovered .5 miles from the release point in slightly less than 2 hours.
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