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The susceptibility of Simulium damnosum s.l. larvae from the Volta River in southern Ghana to temephos after nearly eight years of intermittent treatment

Published online by Cambridge University Press:  19 September 2011

J. H. Adiamah ,
J. N. Raybould ,
D. Kurtak ,
A. Israel ,
B. T. A. Maegga  and
A. K. Opoku
J. H. Adiamah
Affiliation:
Volta River Authority Public Health Laboratory, P.O. Box 77, Akosombo, Ghana
J. N. Raybould
Affiliation:
WHO Onchocerciasis Control Programme, B.P. 549, Ouagadougou, Upper Volta
D. Kurtak
Affiliation:
WHO Onchocerciasis Control Programme, B.P. 549, Ouagadougou, Upper Volta
A. Israel
Affiliation:
National Institute for Medical Research, Amani Centre, P.O. Box 4, Amani, Tanzania
B. T. A. Maegga
Affiliation:
WHO Onchocerciasis Project, P.O. Box 538, Tikuyu, Tanzania
A. K. Opoku
Affiliation:
WHO Onchocerciasis Control Programme, B.P. 549, Ouagadougou, Upper Volta
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Abstract

Nearly 8 years of intermittent treatments with temephos on the lower Volta River at Senchi Rapids, Ghana, produced no change in the susceptibility of larvae of the S. damnosum complex to temephos [Abate (R)]. In contrast, 14 months of temephos treatment in southern Ivory Coast produced resistance.

This difference can be explained by the relatively weak selection pressure exerted by the intermittent treatments on the Volta River and the frequent changes in the composition of the population as shown by cytotaxonomic identification of the larvae.

Résumé

Au Ghana, sur la Basse Volta, dans la zone des rapides de Senchi, huit ans de traitements intermittents au téméphos [Abate (R)] n'ont pas modifié la sensibilitéa à cet insecticide, les larves de simulies du complexe S. damnosum. En Côte d'Ivoire, au contraire, la résistance au téméphos s'est manifestée après 14 mois de traitements seulement. Cette différence pourrait s'expliquer par la faible pression insecticide exercée par les traitements intermittents de la Basse Volta et par les changements intervenant dans les populations simulidiennes de cette zone.

Keywords

Simulium damnosumGhanasusceptibilitytemephos
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 1 , February 1986 , pp. 27 - 30
Copyright
Copyright © ICIPE 1986

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References

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