Abstract
DDT and BHC have so far been applied separately in malaria control programmes. In order to find out how these two insecticides will behave in a combined spray, experiments were carried out both in the laboratory and in the field. A combined spray containing 25 mgm. DDT and 5 mgm. (BHC) gamma isomer per square foot was compared with deposit of 50 mgm. of DDT or 10 mgm. of gamma isomer per sq. ft. applied separately. The results of tests carried out with houseflies and mosquitoes in the laboratory and in the field (in villages of the Grurgaon district, Punjab) have shown that in all cases the residual effect with suspensions was better than with emulsions or solutions, and that DDT–BHC in combination gave a longer residual effect (for two weeks or more) than DDT or BHC alone. The synergistic action of DDT and BHC in combined sprays was very obvious, as not only the combined sprays were effective for a longer period but were also more efficacious in keeping down the density of mosquito population in the villages.
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PAL, R. Synergistic Action of DDT and BHC Combined Sprays. Nature 167, 368 (1951). https://doi.org/10.1038/167368b0
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DOI: https://doi.org/10.1038/167368b0
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