. Activities handbook. Veterinary medicine. N-28349 Airplane releasing carton of sterile flies. The greatest numbers of sterile flies were dispersed in tiie most heavily infested areas and lesser numbers in the lightly infested areas. Federal and State livestock inspectors throughout the Southeastern States examined livestock and maintained close cooperation with livestock owners to determine the inci- dence and relative abundance of screwworms. The native screwworm population gradually declined, and by the end of 1958 screwworms could be found only in Broward and Dade Counties, Florida, where
. Activities handbook. Veterinary medicine. N-28349 Airplane releasing carton of sterile flies. The greatest numbers of sterile flies were dispersed in tiie most heavily infested areas and lesser numbers in the lightly infested areas. Federal and State livestock inspectors throughout the Southeastern States examined livestock and maintained close cooperation with livestock owners to determine the inci- dence and relative abundance of screwworms. The native screwworm population gradually declined, and by the end of 1958 screwworms could be found only in Broward and Dade Counties, Florida, where a localized infestation persisted. This pocket of screwworms was finally eliminated. The last case in the region was found and destroyed February 19, 1959. The only infestation that has been found in Florida since that date was in a dehorning wound, in Highlands County, on June 17, 1959. Challenge and termination The apparent absence of screwworms in Florida for several weeks prompted program officials to test the effectiveness of the eradica- tion effort by discontinuing release of sterile flies in a large part of the formerly infested area. Accordingly, in mid-July 1959, release of sterile flies was discontinued in that portion of Florida south of an east-west line through Lake Okeechobee. The number of livestock inspectors in the untreated area was doubled. and livestock owners were urged to make fre- quent inspections and promptly report any evi- dence of screwworms. When no infestations were reported in the test area in the ensuing 3 months, rearing and release of sterile flies were progressively diminished in the remainder of the Southeast. Screwworm fly rearing operations ceased, and the last sterile flies were dispersed on No- vember 14, 1959. The building then was sealed and sprayed with an activated pyrethrin insec- ticide, and on the following day fumigated with DDVP and TEPP. These precautions were taken to ensure destruction of any fertile screwworm flies tliat mi
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