Abstract
THE control of Glossina tachinoides in the Northern Guinea Savannah Zone1 of Northern Nigeria has now developed into almost a routine measure in which a single application of 5 per cent suspension of DDT wettable powder in water gives sufficient persistence to kill the young flies which emerge from their pupae three or four weeks after spraying, In the Southern Guinea Savannah Zone, where the dry season is more humid and heavy dews form at night, even five applications at two-week intervals of DDT at concentrations varying between 2.5 per cent and 5 per cent have not proved very successful against a mixed population of G. palpalis and G. tachinoides 2. In order to overcome this limited persistence it was decided to carry out a small trial using dieldrin, which was claimed to be more toxic and to have a longer persistence under these conditions.
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