The effects of helicopter applied adulticides for riverine tsetse control on Simulium populations in a West African savanna habitat. I. introduction,methods and the effect on biting adults and aquatic stages of Simulium damnosum s.l. |
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| Authors: | J B Davies C Gboho D A T Baldry C Bellec R Sawadogo P C Tiao |
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| Institution: | 1. Onchocerciasis Control Programme , B.P. 549, Ouagadougou, Upper Volta;2. MRC External Staff, Department of Medical Entomology , Liverpool School of Tropical Medicine , Pembroke Place, Liverpool, L3 5QA, UK;3. Onchocerciasis Control Programme , B.P. 549, Ouagadougou, Upper Volta;4. B?ite Postale 6036, Montpellier Cedex, 34030, France |
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| Abstract: | Abstract Helicopter applied insecticides used for tsetse control were investigated for their potential to reduce populations of Simulium damnosum s.l. in riverine forest in the Guinea savanna zone of southwestern Upper Volta. Populations of aquatic stages and biting females were sampled before and after spraying. Deltamethrin applied at 12·5 g a.i./ha to a 30 km length of riverine vegetation almost eliminated adults for a period of about nine days. Residues which fell into the water killed all larvae in the river. Endosulfan at 100 g a.i./ha applied to a similar stretch of vegetation caused a reduction of over 60% in biting adults for 11 days, but residues falling into the river killed only young larvae. Neither dieldrin at 400 g a.i./ha, endosulfan at 10 g a.i./ha nor deltamethrin at 12.5 g a.i./ha applied to a 5 km insecticide barrier between the experimental blocks and the untreated river appeared to have much effect. This suggests that most S. damnosum were traversing the barrier without coming into contact with the insecticides. |
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