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The use of small plots to study populations of tsetse (Diptera: Glossinidae): Difficulties associated with population dispersal

Published online by Cambridge University Press:  19 September 2011

G. A. Vale ,
B. S. Hursey ,
J. W. Hargrove ,
S. J. Torr  and
R. Allsopp
G. A. Vale
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Department of Veterinary Services, P.O. Box 8283, Causeway, Harare, Zimbabwe
B. S. Hursey
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Department of Veterinary Services, P.O. Box 8283, Causeway, Harare, Zimbabwe
J. W. Hargrove
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Department of Veterinary Services, P.O. Box 8283, Causeway, Harare, Zimbabwe
S. J. Torr
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Department of Veterinary Services, P.O. Box 8283, Causeway, Harare, Zimbabwe
R. Allsopp
Affiliation:
Tropical Development and Research Institute, College House, Wrights Lane, London W8, U.K.
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Abstract

In the Zambezi Valley of Zimbabwe, ULV applications of non-residual insecticide (endo-sulphan and NRDC 161) were made to a 1.8 × 1.8 km block of woodland infested with Glossina morsitans morsitans Westw. and G. pallidipes Austen. The recapture rates of marked flies released in the centre of the block, and recaptured in odour-baited traps in and around the block, indicated that the insecticides killed about 97% of flies that had been released 1–4 hr before spraying. Catches of unmarked male G. m. morsitans in the centre of the block declined after the insecticide applications, but there was no clear effect on catches of female G. m. morsitans and both sexes of G. pallidipes. Data for the movement of marked flies suggested that the minimum daily rates of movement were about 700 m for male G. m. morsitans and about 800 m for the other tsetse. An increase in dawn temperatures, from 17.5 to 27.5°C, was associated with an increase in the rate movement of G. pallidipes in the early morning. The failure to detect changes in the unmarked populations of female G. m. morsitans and both sexes of G. pallidipes was attributed to the high mobilities of these flies and demonstrated that unmarked populations could not be studied satisfactorily in small plots; studies based on marked populations are recommended for such plots.

Keywords

TsetseGlossina morsitans morsitansG. pallidipesspray trialsmark/release/recapturedispersalZimbabwe
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 5 , Special Issue 5: Tsetse Behaviour and Population Ecology , October 1984 , pp. 403 - 410
Copyright
Copyright © ICIPE 1984

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