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The use of aerial spraying to eliminate tsetse from the Okavango Delta of Botswana

The use of aerial spraying to eliminate tsetse from the Okavango Delta of Botswana

Kgori, P.M., Modo, S. and Torr, Stephen J. (2006) The use of aerial spraying to eliminate tsetse from the Okavango Delta of Botswana. Acta Tropica, 99 (2-3). pp. 184-199. ISSN 0001-706X (doi:

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In Botswana, 16,000 km2 of the Okavango Delta were aerial sprayed five times with deltamethrin, applied at 0.26–0.3 g/ha,to control Glossina morsitans centralis Machado (Diptera: Glossinidae) over a period of ∼8 weeks. The northern half of the Delta (7180 km2) was sprayed in June–September 2001 and the southern half (8720 km2) in May–August 2002. A barrier (mean width≈10 km) of 12,000 deltamethrin-treated targets was deployed at the interface of these two blocks to prevent tsetse from invading from the southern to the northern block. Prior to spraying, the mean catches of tsetse from man fly-rounds were 44.6
round/day in the northern block and 101 in the southern. Between September 2002 and November 2005, surveys (∼820 daily flyrounds and ∼2050 trap-days) in the northern and southern blocks failed to detect tsetse. Simulations of tsetse populations suggest that while spraying operations can reduce tsetse populations to levels that are difficult to detect by standard survey techniques, such populations will recover to densities >100 tsetse/km2 after 1000 days, at which density there is a very high probability (>0.999)
that the survey methods will catch at least one fly. Since none was caught, it is argued that tsetse have been eliminated from the Delta. The particular success of this operation in comparison to the 18 aerial spraying operations conducted in the Delta prior to 2001 is attributed to the application of an adequate dose of insecticide, the use of a GPS-based navigation system to ensure even application of insecticide, and the large size and spatial arrangement of the spray blocks coupled with the use of a barrier of targets which prevented tsetse from re-invading the northern sprayed block before the southern one was treated

Item Type: Article
Uncontrolled Keywords: Glossina morsitans centralis, aerial spraying, insecticide-treated targets, Botswana, simulation model
Subjects: S Agriculture > S Agriculture (General)
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
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Last Modified: 29 Jan 2020 13:14
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None

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