Abstract
THE first report of resistance to dieldrin by the tropical bed-bug, Cimex hemipterus, in East Africa was that by Smith1. In observations made during the course of the Pare-Taveta Malaria Control Scheme, it was reported2 that the bed-bug population was reduced to very low numbers following the first dieldrin spray (first treatment of 80 mgm. dieldrin/sq. ft. followed by subsequent treatments of 40mgm./sq.ft. at eight-month intervals), but 14–19 months after this treatment the bed-bugs were present in sufficient numbers to be considered of nuisance value. In a series of laboratory tests it was shown that whereas bed-bugs from an untreated area were all dead after a seven-day exposure to 0.1 per cent dieldrin using a method suggested by Busvine3, there was only an 18 per cent mortality for a similar exposure time among bed-bugs from the treated area.
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References
Smith, A., Bull. World Health Org., 19, 1124 (1958).
Pare-Taveta Malaria Control Scheme (East Africa High Commission, 1960).
Busvine, J. R., and Nash, R., Bull. Ent. Res., 44, 371 (1953).
van Tiel, N. (in the press).
Finney, D. J., Probit Analysis, second ed. (Cambridge University Press, 1952).
Hoskins, W. M., and Gordon, H. T., Ann. Rev. Ent., 1, 89 (1956).
Busvine, J. R., Bull. World Health Org., 19, 1041 (1958).
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ARMSTRONG, J., BRANSBY-WILLIAMS, W. & HUDDLESTON, J. Resistance to Dieldrin of Cimex hemipterus (Fabricius). Nature 193, 499–501 (1962). https://doi.org/10.1038/193499b0
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DOI: https://doi.org/10.1038/193499b0
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