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A verandah-trap hut for studying the house-frequenting habits of mosquitos and for assessing insecticides. II.—The effect of dichlorvos (DDVP) on egress and mortality of Anopheles gambiae Giles and Mansonia uniformis (Theo.) entering naturally

Published online by Cambridge University Press:  10 July 2009

Alec Smith
Alec Smith
Affiliation:
Tropical Pesticides Research Institute, Arusha, Tanzania
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Extract

Assessment of the effects of dichlorvos (DDVP), released from a Ciba XI dispenser, on females of Anopheles gambiae Giles and Mansonia uniformis (Theo.) entering a verandah-trap hut in the Umbugwe area of Tanzania was made over a period of two months in 1964. Of the numbers of A. gambiae that entered one treated and one untreated hut, 27 per cent, of those entering the hut treated with dichlorvos and 48 per cent, of those entering the untreated hut left again. Of the numbers leaving each hut, 38 per cent, left through the eaves of the treated hut as compared with 9 per cent, in the untreated one. In the case of M. uniformis, 88 per cent, of those entering the treated hut and 94 per cent, of those entering the untreated hut left again. Of the numbers leaving each hut, 59 per cent, left through the eaves of the treated hut as compared with 61 per cent, in the untreated one.

Over-all mortalities were 56 per cent, for A. gambiae and 34 per cent, for M. uniformis when the eave-egress fraction from the treated hut was taken into account, compared with 62 per cent, for A. gambiae and 43 per cent, for M. uniformis when the eave-egress fraction was ignored.

The results of bioassays and of chemical analyses showed that the problem of mortality from fumigation in situ was considerably less in verandah traps than indoors or in window traps fitted with funnels of cotton netting.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 56 , Issue 2 , December 1965 , pp. 275 - 282
Copyright
Copyright © Cambridge University Press 1965

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References

Smith, A. (1963a). Effects of dichlorvos (DDVP) on the behaviour of A. gambiae.—Indian J. Malariol. 17 pp. 131–140.Google ScholarPubMed
Smith, A. (1963b). Principles in assessment of insecticides by experimental huts.—Nature, Lond. 198 no. 4876 pp. 171–173.CrossRefGoogle ScholarPubMed
Smith, A. (1965). A verandah-trap hut for studying the house-frequenting habits of mosquitos and for assessing the toxicity of insecticides. I.—A description of the verandah-trap hut and of studies on the egress of Anopheles gambiae Giles and Mansonia uniformis (Theo.) from an untreated hut.—Bull. ent. Res. 56 pp. 161–167.CrossRefGoogle Scholar
Webley, D. J. & McKone, C. E. (1963). The estimation of dichlorvos vapour.—Trop. Pestic. Res. Inst. Misc. Rep. No. 424, 7 pp., multigraph.Google Scholar