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Two tsetse control campaigns have been reported in the valley where the herds that are the subject of the present case study are resident (see Video 2). The first used 'targets' (rectangular sheets of black material impregnated with insecticide - tsetse flies are attracted to black and blue colours) erected around the area (Leak et al., 1995). The second used insecticide in the form of a 'pour-on' applied monthly to the backs of cattle (Rowlands et al., 2000). Problems occurred during the first trial when targets were stolen, resulting in early curtailment of the trial. Thus, a second trial was initiated using the pour-on treatment method. Tsetse control was maintained over a sufficiently long period of time in this second trial to allow, together with the results of the first trial, a statistical assessment of the impact on livestock productivity. This is the subject of this case study.
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