TRYPANOSOMIASIS AND TSETSE CONTROL WITH INSECTICIDAL POUR-ONS - FACT AND FICTION

Insecticidal pour-ons that are applied directly to cattle have been pr omoted widely in the last decade as a new means of controlling tsetse flies in Africa. Tsetse attracted to treated cattle get a lethal dose of insecticide and die. Following a large trial in Kenya, Matthew Bayl is and Peter Stevenson argue here that the reduction in trypanosomiasi s incidence caused by pour-ons exceeds that expected from the impact ( if there is any) on the tsetse population and that certain other (as y et unknown) factors must also be involved.