The American Agriculture Department reports that ordinary house-flies develop increasing resistance to DDT as the more robust members of each generation survive spraying. The department’s laboratory at Orlando, Florida, has developed a strain requiring nearly twice the normal concentration of DDT to kill them.
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https://paperspast.natlib.govt.nz/newspapers/BPB19480130.2.47
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Bay of Plenty Beacon, Volume 12, Issue 17, 30 January 1948, Page 7
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44Untitled Bay of Plenty Beacon, Volume 12, Issue 17, 30 January 1948, Page 7
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