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An evaluation of insecticide-impregnated screens against Glossina austeni (Diptera: Glossinidae) on Unguja Island of Zanzibar

Published online by Cambridge University Press:  19 September 2011

Marc J. B. Vreysen ,
Khalfan M. Saleh ,
Issa S. Khamis  and
Furaha Mramba
Marc J. B. Vreysen*
Affiliation:
International Atomic Energy Agency, Department of Technical Co-operation Programmes Vienna, Austria
Khalfan M. Saleh
Affiliation:
Commission of Agriculture and Livestock, Zanzibar, United Republic of Tanzania
Issa S. Khamis
Affiliation:
Commission of Agriculture and Livestock, Zanzibar, United Republic of Tanzania
Furaha Mramba
Affiliation:
Tsetse and Trypanosomiasis Research Institute, Tanga, United Republic of Tanzania
*
Corresponding author: MJBV. IAEA Project RAF/5/040 c/o Ethiopian Science and Technology Commission, P.O. Box 19917, Addis Ababa, Ethiopia. E-mail: estc@telecom.net.et
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Abstract

A tsetse-control trial was carried out in a primary forest habitat on Unguja Island of Zanzibar to assess the effect of insecticide-impregnated blue cotton screens on a population of Glossina austeni Newstead. In November 1991, screens were deployed at densities of 45–70 per km2 and the fly population was monitored monthly using sticky panels. Both female and male daily catches were not affected during the initial five months after screen deployment, but the physiological age distribution of female flies shifted significantly towards younger groups. Females were more influenced by the screens than males. The fly population was very low after the long rainy season, but increased to pre-control levels three months after the flooding of the forest floor. Thereafter, male and female apparent densities decreased, and 78–91% and 98–99% suppression was obtained for males and females respectively at the end of the 18-month intervention period. While effective control of G. austeni using blue cotton screens was shown to be feasible, it required a high deployment density and a long intervention period.

Résumé

Un essai de lutte contre une population de Glossina austeni Newstead dans un habitat de forêt primaire sur l'île d'Unguja de Zanzibar, a été entrepris pour déterminer l'efficacité d'écrans en coton bleu imprégné d'insecticide. En Novembre 1991, des écrans ont été disposés à une densité de 45 à 70 écrans km-2 et la population de la mouche a été évaluée chaque mois utilisant des panneaux gluants. Les cinq premiers mois, le placement des écrans n'influaient pas sur la capture quotidienne des mouches mâles et femelles mais la distribution de l'âge physiologique des femelles se penchait d'une manière significative vers des groupes plus jeunes. Les écrans influaient plus sur les femelles que les mâles. Après la longue saison des pluies, la population de la mouche était très réduite, mais 3 mois après l'inondation de la forêt, elle augmentait jusqu' à une densité comparable à celle d'avant le placement des écrans. Après cette reprise, les densités apparentes mâles et femelles diminuaient et à la fin de la période d'intervention de 18 mois, 78–91% des mâles et 98–99% des femelles étaient éliminés. La lutte contre G. austeni avec des écrans en coton bleu a prouvé efficace, mais il a fallu une grande densité d'écrans et une longue période d'intervention.

Keywords

Glossina austeniinsecticide-impregnated screenscontrolZanzibarGlossina austeniécrans imprégné d'insecticidecontrôleZanzibar
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 19 , Issue 1 , March 1999 , pp. 75 - 84
Copyright
Copyright © ICIPE 1999

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